twybrow
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| posted on 25/10/09 at 12:33 PM |
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Slight play in bike engine output shaft?
Can anyone tell me how much play to expect in the output shaft (I appreciate you won't know the engine, but you will know bike engines!)? I am
concerned because I seem to have a slight vibrating sound in 1st gear as I pull away. It doesn't seem to do it in other gears. My engine has
alwas shuddered when pulling away at low rpm, but it now seems to be complimented with the metal knocking/vibration sound.
I have checked everything is tight, and where I have play, and the only place I can find any play is in the output shaft. There is a very small amount
of lateral movement, which you can subsequently hear when you yank on it. It isn't much (I cant even see it with my eye), but I cant figure
where else the noise is comin from...
It is also slightly harder than it has been to get into 1st gear (although it does still go).
Have I knackered my gearbox, or am I being overly cautious (Triumph T595 engine btw)....
Thanks!
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shortie
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| posted on 25/10/09 at 12:38 PM |
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I seem to remember I used to have the same thing with the Blade engine.
I just came to xthe conclusion that if it breaks it breaks, there's really not much else you can do if you have checked everything's
tight.
I suggest just drive it and enjoy!!
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ReMan
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| posted on 25/10/09 at 12:42 PM |
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Lateral as in, in and out is ok.
Side to side should be practically zero
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twybrow
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| posted on 25/10/09 at 12:59 PM |
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It is side to side - it can't be more than a mm or two at most, as I can't see it moving, I can just hear it. In out it did move a bit on
assembly, but again, no more than a few mm.
I do like the idea of ignoring it, and going out to enjoy it, but when the last real drive you did resulted in a propshaft off event, it kinda makes
the suck it and see approach a little scary!
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motorcycle_mayhem
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| posted on 25/10/09 at 05:55 PM |
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Probably best ignored.
I have a lot (i.e you can hear it 'clonk' of up and down movement on the GSXR750, less, but still very evident on the GSXR1000.
The GSXR750 has a shorter output case with the difference in sprocket postion (or this case the propshaft adapter) being taken up with a spacer.
It's under one helluva lot of load as a consequence.
Both engines have run like this for 3 years of circuit abuse.
I get vibes, but I don't think it's related. The only serious engine-related vibes have been when the prop adapter nut has come loose.
You'll know when this is lose, you really will, no debate.
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prawnabie
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| posted on 25/10/09 at 05:57 PM |
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He already does lol
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Dusty
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| posted on 25/10/09 at 06:10 PM |
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quote:
the last real drive you did resulted in a propshaft off event
Is this a rebuild then and the same engine that was on the front of a flailing prop? Are you thinking has that episode damaged the output
shaft bearings?
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:{THC}:YosamiteSam
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| posted on 25/10/09 at 06:45 PM |
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have you checked the prop adapter nut? mine came loose too and could be noticed by body vibe..
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ReMan
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| posted on 25/10/09 at 07:28 PM |
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1-2 mm! 
That surely is not good.
Oil seals wont cope with that much movement long either
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twybrow
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| posted on 25/10/09 at 10:33 PM |
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It is a rebuild with the same engine. I'd be amazed if the output shaft didn't get a good whack from the flailing prop, but it felt fine
to turn by hand. I have had to clean up the prop adaptor and the sleeve that goes over the output shaft and through the oil seal.
Tomorrow evening I will dismantle the prop again just to see exactly what is going on. I guessed at the movement, so I could be a long way out....
The nut is held in place with high strength threadlock, but I will check it tomorrow when I borrow a socket. The only other thing I can think of is
the small collar [that went over the output shaft] had a chamfer on one end, and not the other. I couldn't decide which way it should have been
on. Maybe I got it wrong.
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