66 CA77 Kick start seems to slip.
66 CA77 Kick start seems to slip.Just purchased this bike from apparently a very diligent person of vast experience. Bike hasnt gone for a few years. has a genuine 10,000 miles on it and all original with panniers.
clutch is not disengaging and im fine to deal with with a rolling start and accelerate decelerate with clutch in to fix. Just running standard motor oil of 20 50 i think. concern is when i use kick starter, it seems to not be direct to crankshaft and has slippage. It feels to me that the effort of the kick start passes through the clutch and the slippage is occurring in clutch. However from my experience, i feel it does not pass drive through the clutch. Im a former car mechanic but not a bike mechanic. Any help for this new member garage of bikes 1928 J 1000 harley outfit 2 Honda 1979 XL500s CA77 Honda 1966 1981 Honda XR 500 harley 1938 WLDR Norton commando 1071 850 triumph T150 1971 Harley 1994 FXDWG Harley FXR 1995 Suzuki GS 750 Honda 7/70 CB750 (genuine 5000 miles) Kawasaki 1977 Z1000 KTM 525 Various others to clog garage Wanted Bridgestone 90 deluxe or similar Kickstart / clutch slippageThe 'drive' from the kickstart lever to the crankshaft DOES pass through the clutch on this bike (and most others) so what you are describing could well be like clutch slip, even if drives OK while on the road.
They do also suffer from wear in the pawls but this would be a sudden collapse of the pedal rather than a gradual slippage if the problem is in the clutch. At 10,000 miles I wouldn't expect the pawls to be badly worn. Changing to an old fashioned straight SAE 30 grade oil (if you find some) might help but I wouldn't count on it. maybe you should just give the clutch a quick strip and give the plates a good clean and see if this helps, not a difficult job. Could just be a warped plate which may be obvious when you get it stripped down. Re: Kickstart / clutch slippageIf the clutch doesn't disengage (and won't free up) it is unlikely that is is causing the kickstart to slip.
The kickstart knuckle that connects the kickstart lever to the splined kickstart shaft (inside the right cover) has a bit of a design flaw wher the square end of a slot concides with the "V" grooves of the spline. This causes it to crack and split open. This means that the knuckle slips on the spline. Pretty much every CA72/77 and CL72/77 will have a crack in this part by now and some have actually spung open, causing it to slip. I drll a hole at the end of the crack to stop the crack then weld it up. This is the welded crack before re-machining. G G
'60 C77 '60 C72 '62 C72 Dream '63 CL72
'61 CB72 '64 CB77 '65 CB160 '66 Matchless 350 '67 CL77 '67 S90 '77 CB400F
Re: Kickstart / clutch slippageyou guys are amazing and thanks to G man too. such quality responses of knowledge. I have a good supply of older type oils but most are still a multi-grade. Back in the 70's and 80's I was in charge of all machinery service on our farms and we used sae30 grade for everything. I will get the bike registered today or tomorrow and go for a ride tomorrow and see if I can find a more conclusive issue. It does feel like the clutch is slipping when kicking and it is intermittent. So each kick will differ from no slip to some. I feel G man response would provide a constant slip and I trust it is not so serious. But if its slipping a little on kicking then it may easily slip under load and fail? I am hearing calls to slip the clutch out and wash it. Kero or petrol? Re: Kickstart / clutch slippageIf it is intermittent then it may be the pawl inside the kickstart ratchet.
Can you hear anything when it slips? Any solvent would do on the clutch plates. I usually put them in an ultrasonic bath which reall pulls the crud out of them. G
'60 C77 '60 C72 '62 C72 Dream '63 CL72
'61 CB72 '64 CB77 '65 CB160 '66 Matchless 350 '67 CL77 '67 S90 '77 CB400F
Re: Kickstart / clutch slippage
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