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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Ignition Advance
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<blockquote data-quote="Nigel Spaxman" data-source="post: 128776" data-attributes="member: 2907"><p>Those look to be really nicely made pistons. It does look like it was running rich and I wouldn't have thought running rich would ever cause any harm to pistons. I have had some very well used Triumph 650 hepolite pistons do that. One time I had a piston ruined because one of my cylinder liners moved down. It was on a Triumph with an aluminum big bore kit. The kit wasn't very well engineered, the problem was the liners didn't have much of a lip a the top and the aluminum used for the casting seemed pretty soft. The head gasket pushed the liner down slightly. This caused it to pinch in which pushed the rings down ruining the piston. I fixed it by making liners with a much larger lip. Vincents don't have that problem. Make sure your bore is straight and there is no lip at the top. Make sure also that your liners are not to tight a fit where they fit into the recess in the head.</p></blockquote><p></p>
[QUOTE="Nigel Spaxman, post: 128776, member: 2907"] Those look to be really nicely made pistons. It does look like it was running rich and I wouldn't have thought running rich would ever cause any harm to pistons. I have had some very well used Triumph 650 hepolite pistons do that. One time I had a piston ruined because one of my cylinder liners moved down. It was on a Triumph with an aluminum big bore kit. The kit wasn't very well engineered, the problem was the liners didn't have much of a lip a the top and the aluminum used for the casting seemed pretty soft. The head gasket pushed the liner down slightly. This caused it to pinch in which pushed the rings down ruining the piston. I fixed it by making liners with a much larger lip. Vincents don't have that problem. Make sure your bore is straight and there is no lip at the top. Make sure also that your liners are not to tight a fit where they fit into the recess in the head. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Ignition Advance
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