Ad closing in seconds....

Product advice: What's causing debris in RS125 gearbox?

I’ve drained the oil out of my Aprilia RS125’s broken gearbox this afternoon and once I removed the drain plug I noticed small cylinder-shaped bits of metal stuck to the inside of the plug. Any ideas what on earth these could be? Are they the cause of its failure?
Michael Johnson, MCN forums 

If they are like little rollers all the same size and shape I would suggest you have a roller bearing broken up within the gearbox or engine. Have a look at the schematic when you get a manual and see where in the box there is a set of roller bearings – that will point you in the right direction.  There are plenty of downloadable workshop manuals on the web. Try this site
There are several on there for the RS125, including one specifically for the Rotax engine. By the look of it there are about seven sets of roller bearings in your gearbox, but it doesn't look too hard to strip it down and have a look. I hope you sort it and get mobile again ready for the summer.

Bauer Media

Bauer Media Group consists of: Bauer Consumer Media Ltd, Company number: 01176085, Bauer Radio Ltd, Company Number: 1394141
Registered Office: Media House, Peterborough Business Park, Lynch Wood, Peterborough, PE2 6EA H Bauer Publishing,
Company Number: LP003328 Registered Office: Academic House, 24-28 Oval Road, London, NW1 7DT.
All registered in England and Wales. VAT no 918 5617 01
Bauer Consumer Media Ltd are authorised and regulated by the FCA(Ref No. 710067)