Author Topic: CB750 F1 Streettracker/Bratstyle conversion  (Read 30937 times)

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Offline InAquaVeritas

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Re: CB750 F1 Streettracker/Bratstyle conversion
« Reply #75 on: March 28, 2015, 09:57:01 AM »
Made some time to upload some photos finally!

I made a headlight mount without fork ears. I like the clean look of the USD forks and didn't want to ruin it. Bent some 8 and 10 mm steel, along with a few bushes for the indicators.




The oiltank was made from 6 mm wall tubing with two discs welded in. The thick wall tube was the only thing there, so I wanted to to do something with it.



Used the original oil tank cap from the F1 oil tank, of course I lost the cap as soon as this was finished...need to get a new one now...


Feed, return and breather. The feed is made from a piston wrist pin


I want to be able to bring a solid lock, so I needed a tray. The seat comes off with a sliding pin, will take a photo when its done.


Measure and measure again....swingarm is too thick and doesn't clear the back of the engine.  :-[ took it down around the high bits and should be good now.



I got my fenders in and needed to mock it all up before paint. Everything got welded while the parts were at the painters because of the time crunch. I know, wrong order...
Without the rear hoop and rough placement

Final rear fender position:

Rear light

Front fender:

New brackets, the bottom one will be fixed to the bolt that holds the calliper in place, the top one will be fixed to the ZX6R mount with a small bushing


The seat maker had the foam done, so it could be lined up and check for fitment. So, so, so happy with it!  ;D


Fenders came out pretty good given the state they were in. They were rushed, so had to sand and grind for the whole night.

Positioning the new exhaust. Needs a bracket, bit of pipe and some paint.


The painter send some pictures. Insane!




Surf bum trying his hand at wrenching!

Past "bikes" ;)
1981 Honda MT 50cc - Torn apart, put back together and got run down on..
1994 Derby Senda R 50cc - Fell apart
2001 Derby Senda R 50cc - 13/45 changed to 15/70, hit 90 kph in under 150 meters! Undriveable fun!
1987 Suzuki GN250 - Sold
Current bikes
1977 Honda CB750 F1 - F2 engine, '05 ZX6R front end and wheels, '04 ZX6R shortened swing arm converted to twin shock. http://forums.sohc4.net/index.php?topic=133411.0
1987 Honda XR600 Supermoto conversion. CR250 forks and triple. SM wheels, discs front and back. Rebuilt engine. Loudest exhaust in the world: Leovinci X3

Offline Trad

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Re: CB750 F1 Streettracker/Bratstyle conversion
« Reply #76 on: March 28, 2015, 10:52:28 AM »
Nice work on the oil tank. The paint come out fantastic as well.
74 CB550 Build: NOS-GUTTED-OEMplus-HOLDTRUE
http://forums.sohc4.net/index.php/topic,130575.0.html

Offline SOHC4 Cafe Racer Fan

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Re: CB750 F1 Streettracker/Bratstyle conversion
« Reply #77 on: March 28, 2015, 12:21:47 PM »
Interesting faux whitewall using white on the rim.  I've seen that on some hot rod cars.
1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline WnRn

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Re: CB750 F1 Streettracker/Bratstyle conversion
« Reply #78 on: March 29, 2015, 11:56:10 AM »
Love the paint work.
I come from the land down under...
The chief enemy of creativity is common sense (Pablo Picasso)

Offline timrwhi

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Re: CB750 F1 Streettracker/Bratstyle conversion
« Reply #79 on: March 29, 2015, 02:36:57 PM »
Loving the build so far! I'm in the process of making a similar seat to yours, and I'm curious what type of metal you used for the pan and how you ended up bending it?

Offline calj737

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Re: CB750 F1 Streettracker/Bratstyle conversion
« Reply #80 on: March 30, 2015, 05:41:02 AM »
you never sent me details on your controls, but heres a good start for you-
'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline InAquaVeritas

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Re: CB750 F1 Streettracker/Bratstyle conversion
« Reply #81 on: April 02, 2015, 07:45:40 AM »
You are my hero! Sorry I never send the photos. I've been flooded after all the paint came back.

As is now mandatory with my project, everything and everyone is late or delayed.
Paint needs touching up, fork rebuilder is delayed, so is the engine rebuilder.
To avoid a heart attack at 28, I've managed to get extra time by delaying my departure to Spain. Immediate weight of my shoulders! Will update on some more details in the next few days.


Verzonden vanaf mijn iPhone met behulp van Tapatalk
Surf bum trying his hand at wrenching!

Past "bikes" ;)
1981 Honda MT 50cc - Torn apart, put back together and got run down on..
1994 Derby Senda R 50cc - Fell apart
2001 Derby Senda R 50cc - 13/45 changed to 15/70, hit 90 kph in under 150 meters! Undriveable fun!
1987 Suzuki GN250 - Sold
Current bikes
1977 Honda CB750 F1 - F2 engine, '05 ZX6R front end and wheels, '04 ZX6R shortened swing arm converted to twin shock. http://forums.sohc4.net/index.php?topic=133411.0
1987 Honda XR600 Supermoto conversion. CR250 forks and triple. SM wheels, discs front and back. Rebuilt engine. Loudest exhaust in the world: Leovinci X3

Offline InAquaVeritas

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Re: CB750 F1 Streettracker/Bratstyle conversion
« Reply #82 on: April 07, 2015, 08:43:11 AM »
Loving the build so far! I'm in the process of making a similar seat to yours, and I'm curious what type of metal you used for the pan and how you ended up bending it?

Thanks! I made a template with cardboard first. Lay it on top of the frame and run some dirty fingers over the tubing, cut along those lines. Take into account the brace where the battery sits, it needs two bends there, which means extra material.
Trace the template on some 3mm sheet metal and cut that out. I traced the lines with an angle grinder, first a small cut and deeper every pass.
The bit for the brace was the hardest. I used two methods, first one works o.k. but the second one made the best bend.

First one:
Take some excess sheet metal and put it under pan. Clamp it all down and use the pointed end of a hammer or a big chisel to bend the metal around it. Turn the pan upside down, place metal under the raised bit and repeat process.

Second one:
Get a section of narrow, 3mm-ish T-bar. Clamp the T-bar in a vice and use as an anvil. This one worked best to get straight and neat lines.

A bending jig would do part of the trick if the dimensions are right and it's marked properly. I didn't have one at the time and went the ghetto way. 
Surf bum trying his hand at wrenching!

Past "bikes" ;)
1981 Honda MT 50cc - Torn apart, put back together and got run down on..
1994 Derby Senda R 50cc - Fell apart
2001 Derby Senda R 50cc - 13/45 changed to 15/70, hit 90 kph in under 150 meters! Undriveable fun!
1987 Suzuki GN250 - Sold
Current bikes
1977 Honda CB750 F1 - F2 engine, '05 ZX6R front end and wheels, '04 ZX6R shortened swing arm converted to twin shock. http://forums.sohc4.net/index.php?topic=133411.0
1987 Honda XR600 Supermoto conversion. CR250 forks and triple. SM wheels, discs front and back. Rebuilt engine. Loudest exhaust in the world: Leovinci X3

Offline InAquaVeritas

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Re: CB750 F1 Streettracker/Bratstyle conversion
« Reply #83 on: April 07, 2015, 08:44:01 AM »
Love the paint work.

Thanks!! Super happy with it and suits the build really well.
Surf bum trying his hand at wrenching!

Past "bikes" ;)
1981 Honda MT 50cc - Torn apart, put back together and got run down on..
1994 Derby Senda R 50cc - Fell apart
2001 Derby Senda R 50cc - 13/45 changed to 15/70, hit 90 kph in under 150 meters! Undriveable fun!
1987 Suzuki GN250 - Sold
Current bikes
1977 Honda CB750 F1 - F2 engine, '05 ZX6R front end and wheels, '04 ZX6R shortened swing arm converted to twin shock. http://forums.sohc4.net/index.php?topic=133411.0
1987 Honda XR600 Supermoto conversion. CR250 forks and triple. SM wheels, discs front and back. Rebuilt engine. Loudest exhaust in the world: Leovinci X3

Offline InAquaVeritas

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Re: CB750 F1 Streettracker/Bratstyle conversion
« Reply #84 on: May 07, 2015, 12:24:13 PM »
More time for another update finally!

I wanted to replace the springs on my shocks, but when I took them off one of the pistons sank into the housing. So I needed a rebuild kit. Since I had it apart and the chrome was really ugly, I decided to strip it and I'm going to paint it flat white. It will have a black spring.


After getting my paintwork back, which is &$(#&#@ amazing!!, I got my seat back as well.
Made from an old Swiss army bag, it has straps around the back to hold a helmet or bag, using the bags shoulder straps.



The engine had been opened up before and was put back together decent, but far from perfect. One of the small circlips that hold gears in place was installed the wrong way around. This caused it to slip out of gear at speed and fall into gear when idling (almost fell over once..). This damaged all the bearings, so those had to be replaced. I replaced all of them apart from the main shaft big bearing and the final drive double bearing.

The casing and head were peeling bad, it's an F engine so it's supposed to be black but the paint job was horrible. Had the whole thing blasted and painted flat black. The paint used is Berner, a composite paint for professional use and it doesn't just look amazing, it is very strong as well. The guys that blasted and painted the casing, also milled and ported the head for me.
The porting was done according to a pattern thought up by Nismo, the Nissan in-house tuners (they make 1000bhp Nissan Skylines GTR34's) and is supposed to be an amazing port. The valves on the picture are the original ones, just cleaned.



The cylinders were honed and some small things were done. They're the cheaper rebuilders in Amsterdam, but this while thing still cost me €1350,-/$1500,-.... :-\ :-[ :'(
It had to be done, it wasn't firing well and ran decent but nothing close to perfect. Since I've ended up going whole-hog on this, I thought WHAT THE HELL! and did it. The bike cost me 1200,- as a comparison... :'(

Started on the rebuild. Bottom case:


Top case:


The rest will go in tomorrow and then I have to wait for my APE studs to get here. Ordered from Germany, as no-one sells them in Holland, and they had both a public transport and postal strike just after I ordered them. Hope they make it in time!

Painting the frames and other parts now, will make some pics tomorrow and post it asap.

Surf bum trying his hand at wrenching!

Past "bikes" ;)
1981 Honda MT 50cc - Torn apart, put back together and got run down on..
1994 Derby Senda R 50cc - Fell apart
2001 Derby Senda R 50cc - 13/45 changed to 15/70, hit 90 kph in under 150 meters! Undriveable fun!
1987 Suzuki GN250 - Sold
Current bikes
1977 Honda CB750 F1 - F2 engine, '05 ZX6R front end and wheels, '04 ZX6R shortened swing arm converted to twin shock. http://forums.sohc4.net/index.php?topic=133411.0
1987 Honda XR600 Supermoto conversion. CR250 forks and triple. SM wheels, discs front and back. Rebuilt engine. Loudest exhaust in the world: Leovinci X3

Offline InAquaVeritas

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Re: CB750 F1 Streettracker/Bratstyle conversion
« Reply #85 on: May 21, 2015, 12:35:36 PM »
More updates! The end is in sight, but its hard to judge the distance when its the first you go down a trail. Turns out my route had some loops and I ended right where I started, or behind where I was before.

For those wondering about the hours in the next bit and the lack of photos: I was supposed to leave for Spain three days after we started rebuilding it, so we worked through the night and didn't take time to take many photos.

The engine had been opened up a lot it turned out...
First I closed the cases and found the owner had broken a threader in the top case at the front lip. He tried to get it out with a left handed threader, which broke on top of that. The rebuilders ended up taking 1,5 hours to drill it out, oversized..., and put a big plug in. Lost a few days there. Don't have a picture, but it was pretty gruesome...
I did buy some amazing liquid gasket off them: it's stuff used by VW in the factories to seal their engines and it even replaces normal gaskets all around. Its anaerobic, which means it won't set until all the air is removed (torqued down) making this very easy to work with. Its fluo green, which is a bit of a pain when it squeezes round, but thats just some elbow grease to fix that.

After closing the cases and torquing the whole thing down, I struggled for an hour with the alternator cover....it just wouldn't sit right. I mixed up all my bolts when I had to move the opened engine twice and had to sort through them to get the right ones. Absolute pain!


Put the electronic ignition in (Accent EZcoils) and test fitted the clutch basket and new plates.


This is where things went very, very downhill.....
First I had to install the APE studs, but as the shop I was in was moving house, the compressor had gone. No air or anything to clean all the holes, so improvised. To make matters worse, I dropped my M8 threader into the cases.....felt like crying! It was around 3 in the morning...
Had no oil in it yet, so tipped and wiggled and got it out thank god! Got all the studs in, put the pistons on, all the new rings and dropped the cylinders on there. Empty shop means no ring clamp and my hose clamps just wouldn't do the trick. So we sacrileged our way through it by squeezing each ring in, one by one. Happy days as my Irish friend would say!
As they slid in, something was up and sleep deprivation crept up on us, by virtue of not having the cam chain roller up.
Had to pull the cylinders off and do it all again.
Finally got that all sorted, put the head on and started torquing down the bolts. A Honda specialist over here recommended copper washers, so we put those on but it looked weird. Not wanting to back again, we left them for now.
Started putting the cam on and torquing down the cam towers. I immediately pulled a thread on the side. The sun was coming up and we called it a day at 5:30 in the morning.
Went to the rebuilders a few hours later, sort of slept, and he was as gutted as I was. He fixed it quick and we got back into it, only to pull another thread straight away. I was using a small wrench and hardly used any pressure, was set at 0,75 kg. As a test I did a few more bolts and pulled yet another one.

Calling it a day, I lugged in my car and brought it home. After another inspection all the threads seemed in poor condition, one was already coiled. Got a helicoil set and drilled all M6 holes that hold the cam towers. Set about finishing the job and finally got the cam on right!


Put the covers on and almost done with the engine! Need to finish up the clutch, but I don't have the tool for the nut that holds the basket in place.


Before all this, I've been doing some painting:

Frame in flatt black. Paint is Hardhat by Rustoleum.


Bolt porcupine! Had all colours bolts from old and new ones, so painted all of them on a piece of styro.


Covers, kickstarter, brake and shifter pedal, air box


Shock housing. Needs more blasting, as the paint won't stick too well. Were chromed and blasted, but still won't stick too well.


Frame, swingarm and triple


Picked up a big Supertrapp exhaust that was pretty ugly. Painted it black and white.




More bits and pieces


Now for the piece de la resistance! After the painter did a crazy job, my friend put the cherry on top by drawing a sick graphic on the tank and oil tank.



She finally got her name. La Heroìna. Meaning both the drug and the female hero as she is both to me. The build has been addictive, cost me all my money, put relationships on the brink of collapse and in the end it kind of lost the fun because of all the #$%* that is coming out of this build. Female hero as she pulled me through a really bad time in my life and gave me something to look forward to!


Here is 80% complete shot (exc engine):


A fabricator is doing the last things now, like alignment on the wheels, sprockets, etc. Picking it up on monday/tuesday and will be building it up from there on out. I seems like I went through the last valley and cresting the final hill now with a view of the end of this trip.
Surf bum trying his hand at wrenching!

Past "bikes" ;)
1981 Honda MT 50cc - Torn apart, put back together and got run down on..
1994 Derby Senda R 50cc - Fell apart
2001 Derby Senda R 50cc - 13/45 changed to 15/70, hit 90 kph in under 150 meters! Undriveable fun!
1987 Suzuki GN250 - Sold
Current bikes
1977 Honda CB750 F1 - F2 engine, '05 ZX6R front end and wheels, '04 ZX6R shortened swing arm converted to twin shock. http://forums.sohc4.net/index.php?topic=133411.0
1987 Honda XR600 Supermoto conversion. CR250 forks and triple. SM wheels, discs front and back. Rebuilt engine. Loudest exhaust in the world: Leovinci X3

Offline SOHC4 Cafe Racer Fan

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Re: CB750 F1 Streettracker/Bratstyle conversion
« Reply #86 on: May 21, 2015, 12:38:40 PM »
The Day of the Dead graphic is spectacular.  I love it!
1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline flatlander

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Re: CB750 F1 Streettracker/Bratstyle conversion
« Reply #87 on: May 21, 2015, 01:04:07 PM »
just stumbled upon this thread - great work!
maybe i'll see you riding around amsterdam some time.

Offline InAquaVeritas

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Re: CB750 F1 Streettracker/Bratstyle conversion
« Reply #88 on: May 21, 2015, 01:17:52 PM »

The Day of the Dead graphic is spectacular.  I love it!

Thanks! Seeing it for the first time was a shock almost. Didn't get a photo or anything, true reveal style first time.


Verzonden vanaf mijn iPhone met behulp van Tapatalk
Surf bum trying his hand at wrenching!

Past "bikes" ;)
1981 Honda MT 50cc - Torn apart, put back together and got run down on..
1994 Derby Senda R 50cc - Fell apart
2001 Derby Senda R 50cc - 13/45 changed to 15/70, hit 90 kph in under 150 meters! Undriveable fun!
1987 Suzuki GN250 - Sold
Current bikes
1977 Honda CB750 F1 - F2 engine, '05 ZX6R front end and wheels, '04 ZX6R shortened swing arm converted to twin shock. http://forums.sohc4.net/index.php?topic=133411.0
1987 Honda XR600 Supermoto conversion. CR250 forks and triple. SM wheels, discs front and back. Rebuilt engine. Loudest exhaust in the world: Leovinci X3

Offline InAquaVeritas

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Re: CB750 F1 Streettracker/Bratstyle conversion
« Reply #89 on: May 21, 2015, 01:35:15 PM »
just stumbled upon this thread - great work!
maybe i'll see you riding around amsterdam some time.

Bedankt man! Nice bike you have! Love that you kept it original, beautiful colour as well!
I hope to finish mine end of next week, so I might see you soon!
Surf bum trying his hand at wrenching!

Past "bikes" ;)
1981 Honda MT 50cc - Torn apart, put back together and got run down on..
1994 Derby Senda R 50cc - Fell apart
2001 Derby Senda R 50cc - 13/45 changed to 15/70, hit 90 kph in under 150 meters! Undriveable fun!
1987 Suzuki GN250 - Sold
Current bikes
1977 Honda CB750 F1 - F2 engine, '05 ZX6R front end and wheels, '04 ZX6R shortened swing arm converted to twin shock. http://forums.sohc4.net/index.php?topic=133411.0
1987 Honda XR600 Supermoto conversion. CR250 forks and triple. SM wheels, discs front and back. Rebuilt engine. Loudest exhaust in the world: Leovinci X3

Offline flatlander

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Re: CB750 F1 Streettracker/Bratstyle conversion
« Reply #90 on: May 21, 2015, 10:41:55 PM »
sounds like yours will be on the road sooner than mine... i'm waiting for some last parts before i can close up the engine.
it is high time to get these things out of the garage!

by the way, did you get that battery somewhere here?
« Last Edit: May 21, 2015, 11:10:38 PM by flatlander »

Offline InAquaVeritas

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CB750 F1 Streettracker/Bratstyle conversion
« Reply #91 on: May 22, 2015, 08:04:51 AM »
sounds like yours will be on the road sooner than mine... i'm waiting for some last parts before i can close up the engine.
it is high time to get these things out of the garage!

by the way, did you get that battery somewhere here?

When will you close the cases? Big rebuild? I had to do a bunch of gears, bearings and all the clips. If you get into the gearbox, make sure the circlips are put on correctly. They have a rounded and a flat side and the round side should face the gear it is holding in place and the flat side should face the direction it is keeping the gear from moving. The PO of mine got his wrong and it jumped out of fear while riding and in gear while idling. Cheap fix but very important.

I got a Ballistic Evo battery from the States, but there is a similar one sold here called MotoBatt. Yours might work with a single small one, my 750 would need two for cranking amps etc.


Verzonden vanaf mijn iPhone met behulp van Tapatalk
Surf bum trying his hand at wrenching!

Past "bikes" ;)
1981 Honda MT 50cc - Torn apart, put back together and got run down on..
1994 Derby Senda R 50cc - Fell apart
2001 Derby Senda R 50cc - 13/45 changed to 15/70, hit 90 kph in under 150 meters! Undriveable fun!
1987 Suzuki GN250 - Sold
Current bikes
1977 Honda CB750 F1 - F2 engine, '05 ZX6R front end and wheels, '04 ZX6R shortened swing arm converted to twin shock. http://forums.sohc4.net/index.php?topic=133411.0
1987 Honda XR600 Supermoto conversion. CR250 forks and triple. SM wheels, discs front and back. Rebuilt engine. Loudest exhaust in the world: Leovinci X3

Offline flatlander

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Re: CB750 F1 Streettracker/Bratstyle conversion
« Reply #92 on: May 22, 2015, 08:47:30 AM »
thanks for the battery tip! the motobatt is gel which is already better than liquid acid. your ballistic is lithium which is even better and more expensive... but they don't seem to sell them over here.

i'm only doing the topend and am almost ready to finish it up, am now just waiting for some bits and pieces from the US which may take another 2 weeks to arrive. one rocker was not right and i had to get it exchange otherwise i'd be riding now!

Offline InAquaVeritas

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Re: CB750 F1 Streettracker/Bratstyle conversion
« Reply #93 on: May 22, 2015, 08:52:39 AM »
Why not order at Honda4.nl? Has pretty much everything, not cheap but quick.

I think one guy sells them here: Outsiders Motorcycles in Groningen. And yes, it was €170,- inc taxes and import. Like getting a 12v punch in the face...


Verzonden vanaf mijn iPhone met behulp van Tapatalk
Surf bum trying his hand at wrenching!

Past "bikes" ;)
1981 Honda MT 50cc - Torn apart, put back together and got run down on..
1994 Derby Senda R 50cc - Fell apart
2001 Derby Senda R 50cc - 13/45 changed to 15/70, hit 90 kph in under 150 meters! Undriveable fun!
1987 Suzuki GN250 - Sold
Current bikes
1977 Honda CB750 F1 - F2 engine, '05 ZX6R front end and wheels, '04 ZX6R shortened swing arm converted to twin shock. http://forums.sohc4.net/index.php?topic=133411.0
1987 Honda XR600 Supermoto conversion. CR250 forks and triple. SM wheels, discs front and back. Rebuilt engine. Loudest exhaust in the world: Leovinci X3

Offline flatlander

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Re: CB750 F1 Streettracker/Bratstyle conversion
« Reply #94 on: May 22, 2015, 10:20:57 AM »
the rocker needs to be hardweld, to go with the hardweld cam. can't get that this side of the pond.

Offline InAquaVeritas

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Re: CB750 F1 Streettracker/Bratstyle conversion
« Reply #95 on: May 27, 2015, 02:21:23 PM »
Too bad! Why hardwelding? Going for a lot of mods or just durability?


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Surf bum trying his hand at wrenching!

Past "bikes" ;)
1981 Honda MT 50cc - Torn apart, put back together and got run down on..
1994 Derby Senda R 50cc - Fell apart
2001 Derby Senda R 50cc - 13/45 changed to 15/70, hit 90 kph in under 150 meters! Undriveable fun!
1987 Suzuki GN250 - Sold
Current bikes
1977 Honda CB750 F1 - F2 engine, '05 ZX6R front end and wheels, '04 ZX6R shortened swing arm converted to twin shock. http://forums.sohc4.net/index.php?topic=133411.0
1987 Honda XR600 Supermoto conversion. CR250 forks and triple. SM wheels, discs front and back. Rebuilt engine. Loudest exhaust in the world: Leovinci X3

Offline flatlander

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Re: CB750 F1 Streettracker/Bratstyle conversion
« Reply #96 on: May 27, 2015, 11:42:40 PM »
my cam is not a stock profile, it's a special grind from megacycle. these cams are hardweld and then ground to the required profile. due to the treatment its surface is harder then stock, and harder than the stock rockers. as the surfaces of cam and rockers are in contact they need to be of matching hardness otherwise one would be worn down by the other - in this case the stock rockers by the hardweld cam. the prevent this uneven wear, the hardweld cam needs to go with hardweld rockers.

Offline InAquaVeritas

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Re: CB750 F1 Streettracker/Bratstyle conversion
« Reply #97 on: October 30, 2015, 12:53:33 PM »
And we're back! Finally...

Got home from my 4 month season at a surfcamp in Spain and have been fixing up the rust on my van to sell it. It will need a lot money thrown at it to make it right for another long trip and since the bike will take up more cash, I will have to sell it. Need a few more days to finish the filler and paint.


When I'm done doing so, I will start finishing the bike. But first: possible problems I already have!

First of all, my forks were damaged in transport and need to be milled and anodised, which can be done in November. Since the forks will come out, I was thinking of repainting the rear shocks (I rushed it the first time round). These are not really problems, but works that needs doing regardless.

The real problem is in the gearbox:
I might have put one of the "bearings" on wrong. One of the rings that slide over the main shaft might be on wrong and I wonder what the effects will be. It is one of these:


I'm not 100% sure I have lined up the holes with the holes on the splined axle. Will it get enough oil?

Another possible problem is that the oil I primed the pump with might have drained already (it has been sitting for 4 months) and the two oil line ports have been open (forgot...not too much dust in the storage, but still). Can I prime it by slowly kicking it before trying to start it? Oil the cam, cilinder walls and other parts manually (if possible) to prevent damage doing so?
It has been honed, new rings, milled head, ported, cleaned, all new chains, new gears, new kicker/oil pump gear and more. Would hate to run it into the ground...

Would a rebuild be recommended to line it up, prime the pump, clean it out and check all the oil passages? It was my first rebuild ever and I'm kind of #$%*ting myself wether I've done it right to be honest...
Surf bum trying his hand at wrenching!

Past "bikes" ;)
1981 Honda MT 50cc - Torn apart, put back together and got run down on..
1994 Derby Senda R 50cc - Fell apart
2001 Derby Senda R 50cc - 13/45 changed to 15/70, hit 90 kph in under 150 meters! Undriveable fun!
1987 Suzuki GN250 - Sold
Current bikes
1977 Honda CB750 F1 - F2 engine, '05 ZX6R front end and wheels, '04 ZX6R shortened swing arm converted to twin shock. http://forums.sohc4.net/index.php?topic=133411.0
1987 Honda XR600 Supermoto conversion. CR250 forks and triple. SM wheels, discs front and back. Rebuilt engine. Loudest exhaust in the world: Leovinci X3

Offline 754

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Re: CB750 F1 Streettracker/Bratstyle conversion
« Reply #98 on: October 30, 2015, 04:24:05 PM »
The spacer looks like the spline line up the oil holes..
 What did they do to the nice gold forks ?

 Back on post 85 there is a cool cb 350 custom hanging in the air... Got anymore picks of that.?
Maker of the WELDLESS 750 Frame Kit
dodogas99@gmail.com
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline timrwhi

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Re: CB750 F1 Streettracker/Bratstyle conversion
« Reply #99 on: October 31, 2015, 01:58:40 PM »
Curious what kind of handlebar risers/clamps you're running on top of those nicely fabricated spacers? It looks like you've got the Cognito triple trees... was it a simple matter of drilling a couple holes in the top triple and bolting the risers on?