Right now...Its not. Havent even messed with it. I gapped the rings on the new piston and haven't touched it since. I take it the solid black ring is the top compression ring and the other with the sliver edge is the scraper ring correct? I notice the rings have a number and letter on the edges near the gap. Do the letter and number indicate which side has to face up or down? I believe the problem with the 250 may be that yellow main spring. I read up at different places that it is not recommended on the CN250. Maybe it doesn't allow for my pulley to open far enough, keeping my speed down?
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