SOHC.co.uk Forums > CB350/400
Should this shaft have end movement if I pull it by hand?
smoothoperator:
I would have a look at mine Ted but I’m away. Make sure on the washer as it could easily have got misplaced. Hard to see that ovality giving 1 mm of float.
McCabe-Thiele (Ted):
--- Quote from: Oddjob on July 20, 2021, 04:46:44 PM ---Is the thrust washer behind the needle bearing Ted, there should be a 20mm washer between the bearing and the gear.
--- End quote ---
Yes, I assume you mean between second gear & the needle bearing.
The end float is more than the thickness of the thrust washer - if it was ever dished slightly it isn't now it's flat with some light rotation marks.
I've ordered a new needle bearing, thrust washer & lock pins.
The parts book shows 3 of those thrust washers are fitted somewhere in the gearbox so I've ordered all three anyway as they were cheap enough.
I can't see much point in stripping down the whole mainshaft as the endfloat is basically the gap between the fixed gear on one end of the mainshaft that fits up to the large bearing & the second gear at the needle roller end. Second gear sits next to a fixed circlip on wide splines so it can't really move anywhere except for the gap between it & the thrust washer.
As a last resort a second thrust washer might be a option ?
400 Cafe Racer:
Hi Ted,
I just spotted your post as I was about to post a query on the roller pins of the gearchange positive stopper. (Soon)
I have my crankcase halves assemmbled and have been measuring the 5 mainbearing borings for size.
Just been in my garage and checked this shaft for end float - mine is solid with no movement between the shaft and the inner bearing, but if I push in and pull out firmly it will move the outer bearing in the casing and shaft about 0.5mm, which appears to be the side movement in the half circlip and its groove.
Hope this helps. ;)
Regards
Dennis
McCabe-Thiele (Ted):
--- Quote from: 400 Cafe Racer on July 20, 2021, 07:41:32 PM ---Hi Ted,
I just spotted your post as I was about to post a query on the roller pins of the gearchange positive stopper. (Soon)
I have my crankcase halves assemmbled and have been measuring the 5 mainbearing borings for size.
Just been in my garage and checked this shaft for end float - mine is solid with no movement between the shaft and the inner bearing, but if I push in and pull out firmly it will move the outer bearing in the casing and shaft about 0.5mm, which appears to be the side movement in the half circlip and its groove.
Hope this helps. ;)
Regards
Dennis
--- End quote ---
Thanks Dennis I haven't really started on the bearing with the half moon clip side of the equation. What I did notice was that when the crank case was bolted up there seemed to be an overhang of the bearing outside the casing that seemed more than I expected. It might be both bearings are not as planted as the design suggests. Perhaps constant gear changes on a revvy little 400 engineb takes its toll on the bearing fittings. Very useful info thanks. Ted
400 Cafe Racer:
Hi Ted,
This is the overhang on my bearing FWIW. ;D
Dennis
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