Play with the rotor - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 5 (permalink) Old 11-04-2012, 04:14 PM Thread Starter
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Main Motorcycle: 76' Bonneville T140
 
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Play with the rotor

Hi guys,

After all my little problems to replace the sprocket, I was putting the clutch back ( and that went OK for a change ! ) and the rotor / stator.
There is no play in the crankshaft's sprocket, but the rotor after the rated 40lbs tightening has a very slight play, in and out ! I don't understand it as I would thing tightening the nut would compress the rotor. No ?
What gives ?
Thanks as always.
By the way, after a clutch rebuilt, do you put the regularl oil amount or do you go with the " initial fill " of 350cc ?
Thanks.
Terry
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post #2 of 5 (permalink) Old 11-05-2012, 01:53 AM
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beware, this could be a dieing rotor, most of them where held together
with just the zinc based moulding, the steel magnets inside could come lose and tge rotor explode at speed.

later rotors and modern pattern parts, well the wassal ones,
have the magnets welded to the center.

i like keeping my bike fairly original but i had to fit a replacment
rotor asmine had about 20 degrees of loose rotation on the shaft.

this also makes setting the ignition timing with a strobe impossible.

some say you can peen the rotor body so it grips the center adain but i would not trust it.

-Steve
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post #3 of 5 (permalink) Old 11-05-2012, 03:18 AM
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are you sure its the rotor and not crankshaft end float ?
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post #4 of 5 (permalink) Old 11-05-2012, 05:53 PM
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If you can rotate the rotor any amount on its centre,there is no fixing it.Just replace it before it explodes.
The rotational movement is normally more noticable than in/out movement.Is the sprocket moving in/out when the rotor moves in/out?

350 ml of oil will be too much with a triplex primary.On the other hand,I don't think 150 ml (as in the manual) is quite enough.Try 250; any excess will drain back into the crankcase and not cause any problem.
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post #5 of 5 (permalink) Old 11-06-2012, 06:11 PM Thread Starter
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SuperStock
Main Motorcycle: 76' Bonneville T140
 
Join Date: Sep 2012
Location: Davis, California
Posts: 234
Other Motorcycle: 76' Montesa Cota 348
Extra Motorcycle: 76' Kawasaki KT250
Sorry, there was no " rotating " play. It was the whole rotor moving in & out by the tiniest of margins. What it was, and that was a bit weird, I took the rotor out and found the key was not pushed back all the way against the fat spacer. I wacked it back, put the rotor, tightened it and everything was fine.
Thanks for the replies guys !
Terry
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