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Message: [QUOTE="jaguar, post: 1433863, member: 19340"] When the cylinder of my '89 KDX200 got gouged I had a local shop put in a steel liner. But they used a cheap soft steel and it would wear out so fast I had to have it relined every 6 months. Instead of getting mad at the shop I just turned those lemons into lemonade. I tried a slightly different port timing and shape each time just to experiment and get some experience porting. What I finally liked best was that which gave the best mid range boost. I didn't keep notes though so I can't tell you how to reproduce what I did. [/QUOTE]