Honda-SOHC
SOHC.co.uk Forums => CB750 => Topic started by: Alimacdee2 on May 02, 2022, 10:34:49 PM
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Hi all, decided to take the plunge and give the Honda a teardown and address a few issues, fix a dog in the sump pan 4th Gear countershaft sprocket 34T, (didn't affect the gear change, broke off cleanly), will replace the crank oil seal(was cured with a red heat proof unlipped seal & THREEBOND 1184, do the mains shells, a few are scuffed, crank mains looks fine and seems to measure unworn, all those 1000 mile oil changes worked. I've left the crank pins on for now, they seem nice with just a little side to side play, and are tight up and down. Might do them, the primary chains measured 66.43 so ok, the engine was running good, but seeing debris off of the cam chain tensioner wheels, these are original , I'll change the Guide and wheels and chain while I'm in there. enjoying seeing out how little wear is on the engine, seems the camshaft has a bit of wear mainly on the lobs.
the crank pins shells have only done about 34,000 35 on the bike since they were done back in 1990, the invoice for that work has some useful info on it
cheers
Ally
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chrome on lobes looks fine and matt on base , Cam was running fine no noises,
Camshaft center diameter: 21.85 & 21.80, End diameter: 21.94 & 21.945mm,
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R number means nothing and they aint chromed
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So ia heat treatment that can be reground and blends out of the polished finish on the lobes, amazing to think this bike has given over 30 years trouble free miles