2014 front pulley replacement - does it need the flywheel?

[Peter Aawen]

Hi Pete and thanks for reply.

If that thrumming is rhythmic (not constant) then that's what I've got.... ....

That it is! :thumbup:

Sorta sounds like some of the sprocket/belt teeth match up a bit better & make little or no noise, while others don't, so they make noise.... :dontknow: Only the 'frequency of thrumm' isn't anywhere near fast enough for it to be happening on every rotation of either the sprockets or the belt - so I reckon it's gotta be something to do with the harmonics of the belt teeth, sorta like the deeper resonance you get behind the plucked notes when you're trying to tune a guitar & the strings' tune doesn't quite match, if that makes any sense to you?!

That 'three pea-sized spots of grease spaced evenly around the sprocket' test usually quietens the thrumm for a little while, except for on that one Spyder with the 'machine gun' noise I mentioned, a noise that was due to the belt teeth skipping over the teeth on the sprocket under aggressive acceleration - the grease test only made that noise worse, but at least it made it pretty clear what was going on! :shocked:

I'd guess that if you've still got the noise after replacing the front sprocket and the belt, then maybe it's the teeth on the rear sprocket that are the issue (just call me Captain Obvious if you want! ) :dontknow:

Good Luck! :cheers:

Ps: I reckon it's a good call going for the Silver/Pewter 'Sprocket & washer' with the newer HT bolt over the older ceramic coated White sprocket - if you're gonna replace it, then you might as well get the latest and greatest 'fix' even if you haven't seen the problem yet! hyea:

I haven't been able to inspect them side by side yet, but I suspect that the Silver/Pewter or whatever colour on the latest 'sprocket with washer' is a similar ceramic coating to that they put on the White sprockets - a coating that was applied to reduce the obtrusive 'wind noise' the sprockets made on the newer models with less tupperware covering that area; so by fitting that one you'll be killing two birds with one sto.... errrm, sprocket! :thumbup:

 

[Mikey]

I am sorry. I do not understand what you are doing here. How does a wooden wedge have anything to do with adjusting belt tension or position on the pulley? The only way you would not be able to bring the belt further to the right is if it were riding on the inside flange of the front pulley. With the adjusters, you should be able to move the belt to where it is hard against the inside flange on the rear pulley. You don't want this, of course. But the fact that you say you can't even get it close means something is very strange here.

The tensioners at the back of the swingarm are what make these adjustments. Are you loosening the axle when you do this?

Ron, I am thinking they are loosing the axle shaft to much, and are not getting the caps tight on the end of the swing arms! :dontknow: I can't wait to see what the out come is!!!

 

[merlot]

That it is! :thumbup:

Sorta sounds like some of the sprocket/belt teeth match up a bit better & make little or no noise, while others don't, so they make noise.... :dontknow: Only the 'frequency of thrumm' isn't anywhere near fast enough for it to be happening on every rotation of either the sprockets or the belt - so I reckon it's gotta be something to do with the harmonics of the belt teeth, sorta like the deeper resonance you get behind the plucked notes when you're trying to tune a guitar & the strings' tune doesn't quite match, if that makes any sense to you?!

That 'three pea-sized spots of grease spaced evenly around the sprocket' test usually quietens the thrumm for a little while, except for on that one Spyder with the 'machine gun' noise I mentioned, a noise that was due to the belt teeth skipping over the teeth on the sprocket under aggressive acceleration - the grease test only made that noise worse, but at least it made it pretty clear what was going on! :shocked:

I'd guess that if you've still got the noise after replacing the front sprocket and the belt, then maybe it's the teeth on the rear sprocket that are the issue (just call me Captain Obvious if you want! ) :dontknow:

Good Luck! :cheers:

Ps: I reckon it's a good call going for the Silver/Pewter 'Sprocket & washer' with the newer HT bolt over the older ceramic coated White sprocket - if you're gonna replace it, then you might as well get the latest and greatest 'fix' even if you haven't seen the problem yet! hyea:

I haven't been able to inspect them side by side yet, but I suspect that the Silver/Pewter or whatever colour on the latest 'sprocket with washer' is a similar ceramic coating to that they put on the White sprockets - a coating that was applied to reduce the obtrusive 'wind noise' the sprockets made on the newer models with less tupperware covering that area; so by fitting that one you'll be killing two birds with one sto.... errrm, sprocket! :thumbup:

just to let u no Pete
yesterday i removed the pulley..as you can see from the pics it was rusted on....it was a bear to remove but after i fitted the new pulley and belt my tension increased from 140ft/lbs OTG to 200 ft/lbs OTG ......also the belt,when side by side with the new belt,showed stretching after 6 teeth. the new combo was a breeze to align and i left the tension at 200.there is now no acoustic anomalies and gear changes are noticeably improved(due to extra tension)...one happy camper