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<blockquote data-quote="ossagp" data-source="post: 211686" data-attributes="member: 1650">You could have a coolant leak on that one.&nbsp;&nbsp; Abused,&nbsp; maybe.&nbsp;&nbsp; When you get pieces breaking off of the front of the piston it can happen from liquid coming in from the head cylinder area.&nbsp;&nbsp; It is slower at moving than the fuel air mix,&nbsp; and it is something relatively cold hitting something that is very hot.&nbsp;&nbsp; It doesn't take much.I would try to move the aluminum off of the cylinder without using acid on it first.&nbsp; leave any of it and it comes back to haunt you.&nbsp;&nbsp; Mike was correct on the pilot jet affecting the entire range of throttle openings as far as jetting requirements go.&nbsp; If I might criticize your approach a little:&nbsp; you can't jet one on the stand. (well anyway,&nbsp; I sure can't. )you pay less in the long run if you change one thing at a time.&nbsp;&nbsp; adding some &quot;chemical wizardry&quot; to a couple of changes just makes it harder.</blockquote>

[QUOTE="ossagp, post: 211686, member: 1650"] You could have a coolant leak on that one. Abused, maybe. When you get pieces breaking off of the front of the piston it can happen from liquid coming in from the head cylinder area. It is slower at moving than the fuel air mix, and it is something relatively cold hitting something that is very hot. It doesn't take much. I would try to move the aluminum off of the cylinder without using acid on it first. leave any of it and it comes back to haunt you. Mike was correct on the pilot jet affecting the entire range of throttle openings as far as jetting requirements go. If I might criticize your approach a little: you can't jet one on the stand. (well anyway, I sure can't. )you pay less in the long run if you change one thing at a time. adding some "chemical wizardry" to a couple of changes just makes it harder. [/QUOTE]

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