Morning all. My 850 Mk1 has a 950 conversion and the barrels and heads are away for refurbishment at the moment. The barrels has been lightly flash honed and are currently 88 + 0.0015” but still have some wear showing. I have had a look at Gutsibits and they do 88mm rings but not sure how big I can go on the bore before the rings will have too large a gap? Does anyone do oversize pistons or rings?
Appreciate your help
Jamie
You could try Cox & Turner or F W Thornton for rings. Between them they sorted me out for both my pre-war Rudge and my 50’s Ducati single. Both sets of rings have needed gapping correctly as they seem to supply slightly bigger but that’s not difficult to do.
Ian P
It might be my only option is to get a new set of pistons and barrels or to have the originals re-sleeved if possible. I think cost wise, it would be about the same. It’s a shame you can’t get oversized pistons any more.
I have a perfect set of 950 barrels and pistons that have done 1500 miles minus piston rings if you are interested. Would be looking for £250 plus postage.
88.4mm is the next size of rings for the 950 barrels with steel liners. I sourced some 88.4mm ring sets from TLM Nijmegen, but still haven’t sourced any 1st oversized pistons for my very worn out SP barrels..
