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Loose front sprocket

Old 05-07-2017, 05:37 PM
Thread Starter
Join Date: Oct 2016
Posts: 57
Default Loose front sprocket

Went to change the sprocket today and noticed the old one was a little loose, as in it could wiggle around on the shaft even with the sprocket bolt tightened on. I checked with the new sprocket and it has some wiggle room too. I thought maybe the washer on the sprocket bolt is supposed to be a dome washer to hold the sprocket in place, so I checked my factory service manual and says nothing about it being a dome washer or a wear item to be replaced when changing sprockets.
The splines on the shaft don't look worn and the sprocket is for sure not worn because it's brand new. I checked a parts diagram and it shows no spacer is supposed to go anywhere around there so I don't think I'm missing parts.

So does anyone know why my sprockets might be wiggling around on the shaft?

In case it's relevant, it had a 520 chain and sprockets from one of the previous owners. I'm going back up to the original 525 size chain and sprockets.
Old 05-07-2017, 06:02 PM
Hawkwind2016's Avatar
Senior Member
Join Date: Nov 2016
Location: Brighton
Posts: 747

A little bit of play is normal for the front sprocket.

So long as the sprocket bolt is tightened to the correct torque there's nothing to worry about
Old 05-07-2017, 07:01 PM
Senior Member
Join Date: Jul 2011
Location: north/central WV
Posts: 1,136

Dont bother with the 525, stay with the 520.
Old 05-07-2017, 07:31 PM
74demon's Avatar
Administrator and MVN, March 2012/Oct 2013 ROTM
Join Date: Sep 2011
Location: socal 949/951
Posts: 7,979

The front does float around a bit.

I spearrd a dab of silicone around the edge of the washer and let it dry. The sprocket still floats, but it isn't quite as noisy.
Old 05-07-2017, 08:01 PM
Thread Starter
Join Date: Oct 2016
Posts: 57

Good to know. This really surprises me. I've never had a bike that just lets it float around like that before. I have another bike with a similar countershaft bolt but it has a dome-shaped spring washer to hold it still.
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