SOHC.co.uk Forums > Project Board
CB 750 F2
SumpMagnet:
Thanks for the VIN plate bit...plus from what I was advised in my other thread, I think I will go that route too. With lots of pics to prove it's legit.
Curious about needle rollers for the swingarm. Is there any advantage to phospher bronze bushings? Needle rollers is what I am used to on bikes, though I also know what happens when you neglect them. Bought a Gpz1100 'with a fresh MOT' and a swingarm that could be pushed into the footrest hangers either side. Bearing cage was a goner. Apparantly...it handled OK. Sheesh.
I am sure I spotted a grease nipple hole on my swingarm. No nipple...but a clear threaded hole where one would go.
Bryanj:
Needle rollers are fine when they are rolling(hence the name) but don't do too well when only moving through a small radius. having said that keep them well greased( 1,000 miles MAXIMUM preferably weekly) and you will be OK for quite a while
Rob62:
Nice work.... If anybody wants any 3D models knocking up for cad/cam machining etc just let me know...so long as you know the dimensions i can create the model.
Moxey:
Thanks for the info, I'll see how long I can get out of what I have fitted but i'll likely be stripping the bike again next winter for more engine work so a few bearing replacements won't hurt.
@Nurse Julie damn if only i'd posted earlier, will likely be in touch in a few months (Y).
Some CMA alloy wheels for a 750 F2 came up on fleabay around February which I acquired as an early birthday present to myself (they were also in Malton which isn't too far a trek to collect).
They came with discs, hub and sprocket along with some well and truly out of date mismatched tires, here they are after stripping.
And following bearing removal, powdercoating.
Got a full set of Timken bearings for them just need to source some appropriate rubber (I'm torn between the recommended Avons or my personal preference Michelin).
Now for the engine which was stripped alongside all the work on the frame.
Upon removing the valve cover me and my dad (he's got a bit more experience with these engines having owned 3 in the past) made a few discoveries, namely the probable cause of the oil leak....the head bolts were hand tight :o
Following this we found a few of the valve springs were upside down (some would argue this doesn't matter) and two exhaust valves had burnt out, once the barrels were off it looked as though the bores had experienced some light scouring to boot....astounded that it managed to start and run on all 4 to be fair!
No photos of the strip down but one of the head packed for reconditioning (the barrels and pistons too in another box) and the pistons prior to removing the barrels.
I'm led to believe that the owner before last had inherited the bike from his father, going by notes in the Haynes it came with he was 3/4 the way through rebuilding before he snuffed it and the son took over, possibly explaining some of the neglect in the engine.
Anyway I had already wanted to play around with the engine this just forced my hand sooner so I took it to a bloke the next village over my dad had done a few plumbing jobs for, Jimmy Norman,I knew he's big on his Harley and air cooled Suzuki engines turns out from searching on here he's done work on other forum members SOHC machines I also think he's done a few bits for John Wyatt so definitely the man for the job, decent crack too top bloke!
Soda blasted barrels, pistons and head (3 layers of paint apparently, the engine had been red and yellow in the past!)
Re-bored cylinders (more of a skim really, scouring was very light but detectable, still on original rings)
The head got ported, new valve guides (I supplied Bronze APE but if I'd known Jim would have sourced me Kibblewhite) and new springs.
Given more time gas flowing was considered but time and £, I'm still considering going for a big bore kit over winter but I'll be consulting with Mr Norman and others first, hell I might just be happy with the 736 running right so who knows on that front.
Rob62:
Some nice work there....
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