can someone tell me if the oil control rings vary in width on a 750 commando i have tried to fit new +20 oil control rings to my pistons and they are too wide looking down on them.the groove in the piston is 1mm shallower on the new pistons (high compression hepolite's),where can i get a set of +20 narrow rings?? regards nick
If the pistons are Hepolit…
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just found out from a deal…
just found out from a dealer they are hepolite powermax and they dont make the rings anymore!!
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Get some + .030 or .040 if…
Get some + .030 or .040 if you can and carefully file the ends down until you get the correct gap.
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You could have the pistons…
You could have the pistons machined to suit. It would take a bit of careful setting up but do-able. The important dimension is the width of the groove and that must not be increased. A small parting off tool with side clearance and a square nose will do it. If you go too deep they'll make good ashtrays. Or try Thorntons in Shrewsbury for rings.
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I've had to have that don…
I've had to have that done to a couple of sets of Powermax pistons. I'd always managed to get new rings, then I was supplied with the deeper type oil scraper ring and the only option was to get the groove machined to suit.There's plenty of meat on these pistons to do it.It's an easy job for a good engineer. My first set were done my Les Emery, and to be honest they were cocked up with one groove being deeper and sloppyer than the other. The next set I had done by a local chap who is brilliant, so find someone good.
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problem now sorted hopeful…
problem now sorted hopefully,i took some advice and mad a mandrel for my pistons and ground some tool steel the correct width of the groove and increased the depth of the groove on my old trusty myford ML7...........nick
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If the pistons are Hepolite, can't they supply the correct rings for them?