Aprilia help?

daniel.larson2 · Post by **daniel.larson2** » Thu Jun 07, 2012 3:56 pm

I would say shock and awe, but knowing the finicky nature of this scoot I shouldn't really be surprised... I was wondering if anyone might be able to provide some insights into a problem that began today:

It appears that the back brake of my Aprilia SR50 intermittently seizes of its own volition. Luckily this hasn't happened while riding, but when I stop the scooter, and cut the engine, I can't roll the scooter anywhere. Interestingly, when the scooter is on it's center stand and the engine is on, the back wheel starts turning on its own (quite speedily too!), this also has not previously happened. When stopped at a light with the rear brake engaged, I can hear the squeaking of disc on pad as it appears the rear wheel is fighting with its own brake, by wanting to go forward. Is my scoot of two minds? At once wanting to go and also refusing to?

Any thoughts would be welcome, or if anyone is interested to take a peek at it, I can repay in beer and thanks!

Cheers!

nick · Post by **nick** » Thu Jun 07, 2012 4:52 pm

I'm no expert, but I would possibly suspect your clutch as the problem. Sounds like its not dis-engaging when it should.. That's just a guess. Wiser minds will have input.

jaelee · Post by **jaelee** » Fri Jun 08, 2012 12:15 am

yes...maybe the clutch bell needs to be greased

seriously, i would check the clutch, the dust from the clutch pads could be causing some havoc. and while you have the case open check the belt and and the variator face and pulley to make sure they are smooth.

jbcollier · Post by **jbcollier** » Fri Jun 08, 2012 6:47 am

Ditto on the clutch, especially as it won't roll with the engine off. Probably best to have another in hand when you take it apart.

daniel.larson2 · Post by **daniel.larson2** » Sun Jun 10, 2012 12:50 pm

Thanks for the feedback! Does anyone have experience working with the clutch systems on twist-and-go scoots?

jbcollier · Post by **jbcollier** » Sun Jun 10, 2012 2:30 pm

It basically a set of brake shoes that rotate with the engine. When the centrifugal force on the shoes exceeds the springs holding them in place, the shoes move and lock to the clutch bell transmitting drive to the belt.

akrticic · Post by **akrticic** » Sun Jun 24, 2012 7:33 am

Hey Daniel
I remember last time I worked on your scoot, the clutch is the only thing that wasn't replaces. I'd start there, check the pads and springs on the clutch. Just as a precaution, you may have a air in break lines. Bleed them and that should take care of that. Also check the levels of break fluid.
Here is the link for breaks :
http://www.apriliaforum.com/forums/show ... rake-Fluid

Clutch removal:
http://www.youtube.com/watch?v=3INxaxET ... r_embedded

daniel.larson2 · Post by **daniel.larson2** » Mon Jun 25, 2012 5:41 pm

Thanks Alen! Good call on the air in the brake lines.