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<blockquote data-quote="xbacksideslider" data-source="post: 285460" data-attributes="member: 8051"><p>Back when I was young dumb and without money, I restored compression to my Yamaha two stroke motorcycles by just re-ringing them. When the pistons were collaped - that is, when the taper was gone - I knew a guy who would shot peen the inside of the skirts. A quick shot would blow the skirts out a few thou, enough to restore the taper. That part was important because the pistons must hold the rings square to the bore. Rocking pistons interfere with ring seal.</p></blockquote><p></p>
[QUOTE="xbacksideslider, post: 285460, member: 8051"] Back when I was young dumb and without money, I restored compression to my Yamaha two stroke motorcycles by just re-ringing them. When the pistons were collaped - that is, when the taper was gone - I knew a guy who would shot peen the inside of the skirts. A quick shot would blow the skirts out a few thou, enough to restore the taper. That part was important because the pistons must hold the rings square to the bore. Rocking pistons interfere with ring seal. [/QUOTE]
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