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Bent (output) shaft sindrome
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Hi there.
I was involved recently in changing sprocket and chain of my Honda
hornet 600. The chain i had on was the original from Honda and lasted a
honerable 10966 miles. As I'm new to maintenance jobs and repair jobs i
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Not really. 20,000 miles is more usual.
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have a question for the expert audience of this group.
I removed chain and sprockets from the motorbike and installed the new
ones. Once I've aligned the rear wheel i checked for tight spots and
check the tension in different parts of the wheel. Once i was satisfied
with the result i wanted to see if everything looked fine. With the
bike on the rear wheel stand i started the engine and putted it in 1st
gear. I sat down behind the rear wheel looking the rear sprocket. The
rear sprocket had no lateral oscillations and i was perfectly aligned.
Looking at the chain getting feed to the drive sprocket i noticed the
chain oscillating slightly from left to right as the chain engaged in
the drive sprocket (this is only 3-4 millimetres but still very
evident). When i inspected the old drive sprocket, which was installed
on the output shaft, i noticed that it was not rotating perfectly, but
it had some anomalies, with slight oscillations.... I associated this
with the fact that the sprocket were worn.
Now i installed a new drive sprocket and there is still oscillations.
Is this normal or the bike could have a bent output shaft? There is no
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I'd say that 34 mm is too much! It sounds like the output shaft is
bent. :(
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oil leak on the output shaft, but will it quickly wear the chain? Could
tell me if the drive sprocket should be aligned straight without
oscillations or is it normal to have some oscillations.
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34 mm is about the width of a link. That front sprocket is probably
wearing the chain faster than it should, and it's probably wearing the
rear sprocket faster, too.
I can't think of a good way that the sprocket might have been installed
in a way that lets it have that kind of wiggle without an underlying
fault. Lay the old sprocket on a flat surface and check it for wobble:
measure the distance from the surface to the teeth at ~6 places. They
should be more even than you can measure (but might not be because of
wear -- check the thickness if you have a micrometer). If the sprocket
shows no signs of inherent bend (I don't expect any because the new one
showed the same symptom) then there's a fault in the output shaft.
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Your help is very appreciated.
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