Author Topic: Going the distance with a bit more oomph  (Read 5433 times)

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Offline big bad bob dog

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Going the distance with a bit more oomph
« on: February 27, 2012, 07:08:43 PM »
Gent's, Ladies.

Been lurking in the shadows watching the aircooled 4 wizardry going on around here. Have to say this place is a shrine to those who don't know.

My dry build of my 500/4 is nearing completion. Once everything comes apart for paint, new bearings ect, I'm tearing into the engine.

This is my first proper complete build of an engine. I have never done everything in one go, but I have replaced clutches, camchains, rockers and camshafts before. So of course I wish to run this by you fellas/lasses if it were to be viewed.

I'm taking the pistons out to those 605cc (592cc) 3 ring pistons. I want balance and polish everything. HD engine studs, new clutch (550/4) with better springs and looking to source cam work from megacycle for more of a hot street application.

Questions.

I wish to fit a slipper tensioner to the thing. I saw M3 sell one, but cannot tell if this fits only the 750. Does anyone know if it'll plonk into the mid 4?

I wish to find springs with the same spring rating as stock but of a higher quality material, getting the weight down. If I were to get HD springs I think they will be too extream for what the machine needs. Not to mention, as a few have recommened, it will wear the cam quicker. Anyone have any good experiances?

I'll have to update my build here, but to me it still looks like a bucket. It's not meant to be pretty, more functional.

And the last thing, I'm riding this across the States in August. Heres hoping I can put an engine together.

Cheers and thanks in advance.



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Offline FuZZie

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Re: Going the distance with a bit more oomph
« Reply #1 on: February 27, 2012, 08:09:10 PM »
Make sure you've read this tread to start ;)
http://forums.sohc4.net/index.php?topic=40414.0

Offline cbr954

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Re: Going the distance with a bit more oomph
« Reply #2 on: February 27, 2012, 08:41:53 PM »
The 750 slipper tensioner will not fit, but the 500 already uses a slipper type tensioner.
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Offline Sam Green Racing

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Re: Going the distance with a bit more oomph
« Reply #3 on: February 28, 2012, 04:33:33 AM »
Bob, this should be in the project shop as it's not race or radical high performance.
I'll give it a few days till it gets a few more hits before moving it.
Fell free to ask your questions though.

Sam. ;)
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Offline EDU

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Re: Going the distance with a bit more oomph
« Reply #4 on: February 28, 2012, 05:06:14 AM »
Subscribe!  ;D

I'm trying to do something similar (more like getting my mechanic to do it since I'm mechanically retarded) and I'm also in Sydney!! Great to see another 500/4 here!

Offline big bad bob dog

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Re: Going the distance with a bit more oomph
« Reply #5 on: February 28, 2012, 06:11:06 AM »
Ah, sorry Sam. Transfer which ever way is needed.

In regards to the tensioner, that would be me not getting my words right. Apologies, what I was referring to is a stronger, more modern tensioner design, to which the 750 m3 piece looks to be. Of course, the original Honda offering is sturdy and will last quite some time, but I was looking for something a little beefier.

I probably should be smarter and just email them.  :P But thanks for the heads up.

I also wish to throw CR26 smoothbores in there. From what I'm reading around, the issue is the spacing and manifolds availability for these carbs in question to the 500/4. Don't have a lathe so making the part isn't an option unless I farm it out.

Next question lads. Best place to make a purchase for the more serious stuff? Looking at dynoman and M3 for a few bits and bobs. As always, any advice is appreciated.

A few more photos of where I'm at.













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Offline turboguzzi

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Re: Going the distance with a bit more oomph
« Reply #6 on: February 28, 2012, 09:09:59 AM »
welcome to hipo BBBB

sounds like you are doing the right stuff, not too extreme.

 i did a modern tensioner transplant, but only because my head/block was decked so much for compression that the stock tensioner wouldnt tension anymore

http://forums.sohc4.net/index.php?topic=55162.0

did two seasons with the stock tensioner, engine always between 7000 - 12000 rpm without any problems, so you are worrying for nothing...

Offline scunny

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Re: Going the distance with a bit more oomph
« Reply #7 on: February 28, 2012, 09:18:09 AM »
what's the gauge mounted on your frame ?
past-cb100,ts250,cb500,cb500,gs1000,gs650g.phillips traveller
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Offline MRieck

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Re: Going the distance with a bit more oomph
« Reply #8 on: February 28, 2012, 11:06:12 AM »
what's the gauge mounted on your frame ?
U think it is a speedo. It looks like an odometer on the face.
Owner of the "Million Dollar CB"

Offline big bad bob dog

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Re: Going the distance with a bit more oomph
« Reply #9 on: February 28, 2012, 02:01:11 PM »
what's the gauge mounted on your frame ?


Tis' the speedo. Frame drilled and braced to accept the speedo cable.

Thanks TG. I have a phobia of cam chains, being a lover of the 2 cycle engine variety :p
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Offline Jerry Rxman Griffin aka MuthaF'er

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Re: Going the distance with a bit more oomph
« Reply #10 on: February 28, 2012, 04:18:58 PM »
Don't worry about better springs wearing your cam. It will probably outlast all the riding you'll do. PLUS stronger/newer/better springs are cheaper than floating a valve and destroying an engine PLUS higher rpms are possible provided all the right parts are used.
As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline big bad bob dog

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Re: Going the distance with a bit more oomph
« Reply #11 on: June 27, 2012, 06:01:29 PM »
Chaps. Finally have time to update everything.

Bike is in the container floating it's way Stateside where I pick her up on the 24th of July.

What happened since I last posted...

Recieved some goodies.



Powdercoated the frame and swingarm, rebuilt the front end, did the wiring



Had to cut the gusset in the swingarm and weld to alloy bars further up for stregth, tire would clear.



Machined some intake manifolds for the CR26's



started to wack everything together..





and ignore my friends odd head, but this is how she ended up! The steering damper is removed here just to test the neck bearings are seating correctly.

So in the end she looks like this:


She still needs some sorting.

Jetting CR26's with a custom manifold, with 592cc and a 4 into 1, is rather different than stock. This will happen on the road, but more of that in a minute.

My biggest problem is shifting. The shifting mechanism was off the cb500/4, yet I used the cb550/4 cases. Shifting up is fine, shifting down is nigh impossible with out allot of fettling with the lever. I have order the correct mechanism and will install it to suit the drum end in LA.

It's funny to me, cause I'm riding this thing across the USA. My father, two friends and myself are doing a charity run from LA to Maine and down to NYC in benifit of a friend who was in a freak accident and became a quadraplegic.

I'll up date you guys if you like, we have a little logo:



But I have to spreuk SOHC4. Without this site, guys and gals, this would have been closer to impossible to me than I thought it already was.

Cheers all.
« Last Edit: June 27, 2012, 06:04:12 PM by big bad bob dog »
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Offline turboguzzi

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Re: Going the distance with a bit more oomph
« Reply #12 on: June 27, 2012, 09:45:28 PM »
ok, let us get it right....

so you are planning to ride across the USA on a bike shipped from Australia on which you hardly did any shake down rides (and have already shifting problems, carbs to sort out)?

shall be interesting to say the least, you are a brave man

TG

Offline big bad bob dog

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Re: Going the distance with a bit more oomph
« Reply #13 on: June 27, 2012, 09:54:05 PM »
ha. Not exactly.

So about 1000 miles on it. Engine has been broken in. Head retorqued.
Carb's are 80% there. She idles and behaves, streetable, but needs fine tuning. Bringing allot of jets with me.

I know exactly what the issue is regarding shifting. Just need to swap that over, and then i'm golden. Well that's what i'm hoping for.

Stupid yeah, but it shall be an experiance.

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Offline camelman

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Re: Going the distance with a bit more oomph
« Reply #14 on: June 29, 2012, 09:23:31 AM »
What did you do to the front brake?  It doesn't look stock from what I could see.

Congrats on putting together a great bike.  Are you coming through San Francisco?  If so, then I can show you some AMAZING roads out here.

Camelman
1972 350f rider: sold
1972 350f/466f cafe: for sale
1977 CB400f cafe:sold
1975 CB400f rider: sold
1970 CB750 K0 complete bike: sold
2005 Triumph Sprint ST 1050 rider

We've got to cut it off... and then come down on rockets.  (quoted from: seven minutes of terror)

Offline big bad bob dog

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Re: Going the distance with a bit more oomph
« Reply #15 on: July 02, 2012, 07:57:54 AM »
Hey Mr Camelman,

disk is a cbr900 wave type disk. Machined to fit the hub. Caliper is off an sv650. Spacing was a nightmare, so a lazy side caliper was needed for clearance. In the future I'm going to adapt the gl forks. wack on another disk and get something opposed piston.

The weight compared to the originals is noticable, and that was more of the plan from the beginning.

Thanks by the way. I am indeed going through San Fran. We're on a tight schedule, but i'll dig around for the map in my email and post it up. The more the merrier.
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Offline turboguzzi

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Re: Going the distance with a bit more oomph
« Reply #16 on: July 02, 2012, 09:38:57 AM »
What did you do to the front brake?  It doesn't look stock from what I could see.

Congrats on putting together a great bike.  Are you coming through San Francisco?  If so, then I can show you some AMAZING roads out here.

Camelman

yep, got to agree, hgw 1 starting from the gas station at shoreline off the 101 to point reyes is not bad ;)

Offline Jerry Rxman Griffin aka MuthaF'er

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Re: Going the distance with a bit more oomph
« Reply #17 on: July 02, 2012, 10:14:45 AM »
Get that map and itinerary up. Some of us can provide food and lodging as a donation.
As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline big bad bob dog

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Re: Going the distance with a bit more oomph
« Reply #18 on: July 02, 2012, 06:21:29 PM »
Thanks lads.

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Offline MRieck

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Re: Going the distance with a bit more oomph
« Reply #19 on: July 02, 2012, 07:15:08 PM »
New Hampshire.....where the hell is that???? ;)
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Offline camelman

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Re: Going the distance with a bit more oomph
« Reply #20 on: July 02, 2012, 08:57:05 PM »
That looks like a straight shot on 80.  I know just the roads to put some spring back in your step after that journey!
1972 350f rider: sold
1972 350f/466f cafe: for sale
1977 CB400f cafe:sold
1975 CB400f rider: sold
1970 CB750 K0 complete bike: sold
2005 Triumph Sprint ST 1050 rider

We've got to cut it off... and then come down on rockets.  (quoted from: seven minutes of terror)

Offline Felix

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Re: Going the distance with a bit more oomph
« Reply #21 on: July 05, 2012, 04:27:13 AM »
What kind of tank is that?
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Offline andy750

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Re: Going the distance with a bit more oomph
« Reply #22 on: July 05, 2012, 06:15:20 AM »
Let me know when you get to Massachusetts and I can show you some good roads to make the journey through NH and Maine a bit more enjoyable than simply taking I-90 (not enjoyable).

If you need cheap accommodation in Boston I can provide that too - bring a sleeping bag and camping mat ;) Beer provided ;)

Good luck! Great trip!
cheers
Andy
Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico, 2003 - European Tour, 2004 - SOHC Easy Rider Trip , 2008 - Adirondack Tour 2-up , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. Yamaha Tenere T700 2022

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Offline big bad bob dog

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Re: Going the distance with a bit more oomph
« Reply #23 on: July 06, 2012, 09:13:58 AM »
Tank is off an SR400 yammy. Nut welded on the back, with a mount welded onto the frame, ewith two spacer mounts smacked over the stems provided for the original honda rubbers. Yammy rubbers go over for a nice fit. Also had to cut back the edges on the rear and reweld them for frame clearence.

I'll let you know Andy for sure. Cheers!

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Offline Felix

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Re: Going the distance with a bit more oomph
« Reply #24 on: July 06, 2012, 09:51:51 AM »
Would that mean they also fit on CB400F's?
Honda CB500F '72 in progress

Offline big bad bob dog

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Re: Going the distance with a bit more oomph
« Reply #25 on: July 07, 2012, 07:58:04 AM »
It wont just bolt on. like I said, for this to fit I had to alter the rear end of the tank, then make new mounts  on the frame for the front.

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Offline Felix

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Re: Going the distance with a bit more oomph
« Reply #26 on: July 07, 2012, 01:42:54 PM »
Ok, thanks.
Honda CB500F '72 in progress