Author Topic: What did you do to your bike today ? (Read 3334701 times)

Ace · « **Reply #19525 on:** March 30, 2015, 06:37:09 AM »

Paying attention to detail revealed a few issues with new valve guide seals. I've had them for a few years and can't remember which store I purchased them from. The chips I was going to put on an exhaust and the split was on intake. I only noticed the split when I fed the valve through.

evanphi · « **Reply #19526 on:** March 30, 2015, 06:40:54 AM »

Quote from: Ace on March 30, 2015, 06:37:09 AM

Paying attention to detail revealed a few issues with new valve guide seals. I've had them for a few years and can't remember which store I purchased them from. The chips I was going to put on an exhaust and the split was on intake. I only noticed the split when I fed the valve through.

Those look like the ones I got in my Athena gasket kit.

Retro Rocket · « **Reply #19527 on:** March 30, 2015, 03:37:48 PM »

Quote from: Ace on March 30, 2015, 06:37:09 AM

Paying attention to detail revealed a few issues with new valve guide seals. I've had them for a few years and can't remember which store I purchased them from. The chips I was going to put on an exhaust and the split was on intake. I only noticed the split when I fed the valve through.

Good catch...

Cqyqte · « **Reply #19528 on:** March 30, 2015, 06:02:21 PM »

Changed last years oil, spun a new filter on and fired her up to ensure the jets are cleaned of last years gas varnish.

Bailgang · « **Reply #19529 on:** March 31, 2015, 01:50:17 AM »

The weather was finally decent enough for me to take the 750 out and see how well the boyer ignition I had installed worked. It wasn't any sort of night and day difference but it definitely ran stronger and smoother and wasn't nearly as "cold blooded" when starting up cold. The only problem now is that while setting the timing a week ago the engine kicked backed while turning it over and the starter clutch took a beating so now sometimes the starter turns the engine over, sometimes it doesn't because the starter clutch is slipping so now I have to pull the alternator cover off and pull the flywheel to check it out.

NSvane · « **Reply #19530 on:** March 31, 2015, 08:47:11 AM »

I collected it from winter storage. Didn't do anything to it other than kicking it into life (battery was nearly drained). It had been standing with a danish product called BellAdd which acts as carb-cleaner and "water-remover" (dont know the english word for it).
Then I put some air in the front tyre and drove 150km's through 15-25 m/sec winds which mid-route threw a lorry on its side (but not me and the four

). On top of that it rained for about 80 % of the trip, while the temperature was 5-8 degrees C.

Now it stands waiting for the snow (!) to stop so that I can lubricate the chain, top off the oil, clean it, and RIDE!

Oz350Four · « **Reply #19531 on:** March 31, 2015, 08:50:34 PM »

Just finished rebuilding these babies... replaced virtually everything except the emulsion tubes...!!!

PeWe · « **Reply #19532 on:** April 01, 2015, 11:38:25 AM »

Quote from: evanphi on March 30, 2015, 06:36:54 AM

Knocked a few things off my list this weekend...

Dropped the oil pan. Found little flakes of what looks like aluminum (probably from PO's drill and tap), and a bigger piece of something ferrous... ~~Piece of piston ring~~ (Not enough radius to be piston ring). Anyone have an idea? Cleaned everything out, sprayed with engine degreaser and scrubbed. Torqued the bolts down like a drum head (opposite sides, clockwise) to 75 in/lbs with a bit of Permatex Ultra Grey (AKA Hondabond) around the flanges to seal them off. Topped it all off with 3L of oil.

Also replaced fork oil. HOLY HELL that old stuff stinks. Opened the drain screws, bounced the forks till the holes were just farting, but not sharting. HAHA. Then added 160cc of 10W fork oil. I was able to keep my bars in place and use my adjustable wrench to get the caps out, using a 3/8 ratchet extension to keep pressure so the cap didn't fly off. (don't mind the white on the disk, just reflection of the flash)

Cut some channels into the brake pads, and rounded off the edges of the pads. Added some anti-sieze behind the pads to give a bit of lubrication, too. Lifted the front end and hit the disk with some 600 grit wet-dry to take some of the glaze off. Wiped it all down with brake cleaner, and called it a night.

Just got word last night that my cam towers and rocker shafts are going in the mail today! Looking forward to getting it all back together. Going to be doing touch-ups on the engine paint by hand. Using Duplicolor Engine Enamel in low gloss black, I will spray into a little bucket and paint with a brush... don't want any overspray on the valve cover.

Check if all clutch fiber plates are OK, the ears. I had the outer ear broken twice back in the 80's when I got wrong clutch plates to my K6 that need 6 pltes look the same, the outer plate must have wider ear when the basket is wider. If not the outer clutch plate ear can brake. I did not see this problem when I trusted the companies I ordered from. They did not know CB750 clutch differencies.

EDIT:
About the piece of steel, no piston ring. Maybe from the bearings in the gearbox that have half -rings keeping them in position? Only possible if the crank case halves have been opened and not properly assembled.

PeWe · « **Reply #19533 on:** April 01, 2015, 11:46:37 AM »

New fuel lines on my CB750. Before cheap fuel hoses that did not like gasoline. Cheap hoses, probably from China sold by low cost part dealer.
Hoses from Gates, made in USA. Gates Barricade 4219BF Fuel Injection Hose. Can handle gasoline, bio-fuel, methanol etc.
Wrote about it here, before and after. http://forums.sohc4.net/index.php/topic,146431.0.html
Photos here too

ekpent · « **Reply #19534 on:** April 01, 2015, 07:43:20 PM »

Sorry no pics but worked on the everyday rider Honda 750 but , looked over and saw the 75 Kaw 900 Z1 sitting by my front door so wheeled it out and tossed a battery in. Over 60 today -Whoo Hoo . Open petcock and hit starter and game on. Purred to life with that evil old gas from last fall. Went to Sean B's shop and no one there but his Buddy and had a chat. Went out to a friends shop later who does old bikes and heard I just missed him. His shop is packed with work and he said he had not been for a ride yet this year. Tossed him the key and said go ride and chatted with his wife for awhile. When he returned with a smile I heard something about 80 in second gear and my 3/4 helmet with face shield I lent wanting to come off his head at 100 MPH. Guess He had a good first ride also

I like the old 750's but there are other really good machines out there also

Back to the old girl soon and ---- Get'er finished
Sean you take it next if I can find you-----

edwardmorris · « **Reply #19535 on:** April 01, 2015, 09:21:54 PM »

Finished rebuilding my oil pump!

kennyw · « **Reply #19536 on:** April 01, 2015, 09:41:02 PM »

Found this one following me home today and I had to keep it.

strynboen · « **Reply #19537 on:** April 02, 2015, 03:27:05 AM »

made nev bronce bushens for the spedometer neddel...they vas 5mm autside.. 1, 2 mm,at shaft boring,,and 3,0mm at the press inn fit...a bit hard to get done

nuv to find a nev spedo face...and a new needel

Stev-o · « **Reply #19538 on:** April 02, 2015, 05:58:49 AM »

Quote from: kennyw on April 01, 2015, 09:41:02 PM

Found this one following me home today and I had to keep it.

Hey Kenny.....Congrats and welcome to the site. Do you happen to know how many cams your Honda has?

kennyw · « **Reply #19539 on:** April 02, 2015, 06:29:38 AM »

Quote from: Stev-o on April 02, 2015, 05:58:49 AM

Hey Kenny.....Congrats and welcome to the site. Do you happen to know how many cams your Honda has?

To be honest, I have not been that far into it. It is an '82 CB750C. This forum is what came up in a tapatalk search as the most active for the CB750 and I found posts covering the 81/82 model years at the top of the most recent posts. Looked like a good place to get info.

kennyw · « **Reply #19540 on:** April 02, 2015, 09:33:09 AM »

So you're saying I can get moral support here but not parts...

evanphi · « **Reply #19541 on:** April 02, 2015, 10:47:08 AM »

Quote from: kennyw on April 02, 2015, 09:33:09 AM

So you're saying I can get moral support here but not parts...

Not on the main forum anyway. Check the "other bikes" section. There are also other cb750 sites that cater to the DOHC.

PeWe · « **Reply #19542 on:** April 02, 2015, 01:56:10 PM »

Got my CB750 to purr nice and stable on idle, 1100-1200 rpm despite rather hot cam, Megacycle 125-20. Carbs not synchronized with vaccum gauges either.

Found the problem that tricked me for a while causing bad idle, behaviour as too lean and engine quacking like a crazy hen now and then. A loose ignition wire, still contact with Dynatek coil. The rubber protection kept it in place with unstable connection. Will strap 1, 4 wires into the frame.
Before that bad fuel lines causing too lean on 1-2.

seanbarney41 · « **Reply #19543 on:** April 02, 2015, 02:11:01 PM »

Quote from: ekpent on April 01, 2015, 07:43:20 PM

Sorry no pics but worked on the everyday rider Honda 750 but , looked over and saw the 75 Kaw 900 Z1 sitting by my front door so wheeled it out and tossed a battery in. Over 60 today -Whoo Hoo . Open petcock and hit starter and game on. Purred to life with that evil old gas from last fall. Went to Sean B's shop and no one there but his Buddy and had a chat. Went out to a friends shop later who does old bikes and heard I just missed him. His shop is packed with work and he said he had not been for a ride yet this year. Tossed him the key and said go ride and chatted with his wife for awhile. When he returned with a smile I heard something about 80 in second gear and my 3/4 helmet with face shield I lent wanting to come off his head at 100 MPH. Guess He had a good first ride also I like the old 750's but there are other really good machines out there also Back to the old girl soon and ---- Get'er finished
Sean you take it next if I can find you-----

hey Eric, sorry you missed me. It's because I have been working 50 hours a week and then running around like a headless chicken trying to make any one of my bikes ride-able, and generally failing in the attempt...they all need something that I can't get fast enough!...really got caught behind the 8-ball this spring...

Stev-o · « **Reply #19544 on:** April 02, 2015, 04:14:02 PM »

Quote from: ekpent on April 01, 2015, 07:43:20 PM

...looked over and saw the 75 Kaw 900 Z1 sitting by my front door so wheeled it out...

Same here! And it put a huge grin on my face!

Stev-o · « **Reply #19545 on:** April 02, 2015, 04:37:03 PM »

Quote from: calj737 on April 02, 2015, 06:38:08 AM

He's busting your chops....

No disrespect meant. We like all bikes here, even bikes without cams!

kennyw · « **Reply #19546 on:** April 02, 2015, 09:12:42 PM »

No worries. Unfortunately, I haven't found a site as good as this one for the DOHC yet.

I did get the new bike on the road today. Needs the carbs cleaned as it falls flat at 4500 RPM. Rear suspension was too stiff with the extra set of shocks and the front was too soft with no air in it.

Got it home and pulled both wheels to drop off tomorrow for new tires.

goldarrow · « **Reply #19547 on:** April 02, 2015, 10:27:15 PM »

Hang around the site long enough the dohc4 might breed off to two sohc4's

Terry in Australia · « **Reply #19548 on:** April 03, 2015, 04:24:07 AM »

Well while we're talking about DOHC bikes, I did a little work on my 1987 Yamaha FJ1200 today. The weather here is still excellent for riding, but I haven't been doing much lately as I was channelling all my efforts (and dollars) into my twin turbo Subaru, but it's now legally on the road, so it was time to go play with my two wheelers again.

The FJ1200 is an amazing old beast, with 130 BHP it's capable of happily sitting on 150 MPH all day, it handles reasonably well for it's age (well, really good compared to our old SOHC4's, but not that good in comparison to modern bikes, but that's just the whole "evolution" thing, so no biggie) and with Yamaha's twin opposed piston calipers it should stop reasonably well, but mine has had a problem with this, that even new MC and caliper kits have not been able to fix.

After several attempts at stopping it from leaking I abandoned the OEM master, and bought these MC's from eBay.
http://www.ebay.com.au/itm/7-8-Motorcycle-Handlebar-Control-Brake-Master-Cylinder-Hydraulic-Clutch-Lever-/181688563825?

Just like me they were cheap, and as mine also has a hydraulic clutch, the other one will come in handy too. It didn't take long to mount and bleed the MC this afternoon, although it still has air in the system, (after I disconnected the factory "anti-dive" mechanism which may have contributed to the problems I've had bleeding the system in the past) so I've left the reservoir cap loose so the air can bleed out over night thanks to good old gravity.

Tomorrow, if I'm not picking up more parts for my little Subaru, I'll be riding up to Broadford to meet up with some like minded FJ1200 riders for a coffee and a chat. The big Broadford Easter motorcycle spectacular is on over this weekend, but I've got too many motorcycle chores to do this weekend, so won't be spending too much time admiring someone else's bikes. I just hope my brakes work! Cheers, Terry.

Ace · « **Reply #19549 on:** April 03, 2015, 04:51:50 AM »

Replaced the swing arm bushes in the K1. Drift plus hammer and they both came out. Put the new bushes in the freezer for a bit, put the swing arm in the sun and tapped them in 5mm from the outer lip. Used the forum search function for the torque setting for the swing arm nut, all good. No movement from side to side so going around corners won't raise the heart rate unexpectedly anymore I hope.

Torque info found here: http://forums.sohc4.net/index.php?topic=57279.0

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Author Topic: What did you do to your bike today ? (Read 3334701 times)