Quote:
Originally Posted by muzikill
Chain could be too tight or back wheel a mile out causing transmission shaft be pulled against the seal.
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If the shaft can be moved even a tiny bit then the bearing is knackered - the chain tension being grossly overtight could conceivably cause this - but not in a weekend.
If the shaft can move at all then the seal will not work, resetting the chain will not allow the seal to function.
Quote:
Originally Posted by muzikill
Could also be the sprocket spacer with seal ring not fitted right or perished in removal. Could be fitted wrong way round. Transmission output shaft seal could have been moved / damaged.
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This - it's far more likely that something seal wise was damaged/omitted/wrongly refitted when the front sprocket was changed.
Also check the clutch pushrod seal, it's rare, but not unknown, for the seal to be damaged when the lifter is removed - as it must be to access the front sprocket.