HomeBecome a MemberMember Login

We value your privacy

We use necessary cookies to make our site work. We'd also like to set optional analytics cookies to help us improve it. We won't set optional cookies unless you enable them. Using this tool will set a cookie on your device to remember your preferences.
I AcceptLeave cookies off

Piston Broke


2nd Dec 2015

we were on the road between sections on the Cotswold Trial, luckily just taking it relatively easily and there was a nasty crunching and grinding noise, so I switched off and coasted into the drive of a very posh house. I thought that the clutch had gone pop! Unfortunately not. So just do do a little more damage I started the engine again and the noise hadn't gone away - bugger!  We gave up at that point. Got it home, pulled off the front cover on the crankcase and their was pieces of piston in the crankcase. Took off the left hand head and found a broken off valve and holed piston! 

If anyone has any 85.5mm diameter pistons with a 50mm compression height.... 

Matt Blake