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Message: [QUOTE="Rich Rohrich, post: 678069, member: 16241"] As you shorten the length of the silencer or increase inner core diameter it tends to decrease the bleed-down pressure and will usually move power to a higher rpm. Lengthing the silencer or decreasing the inner core diameter will usually move power to a lower rpm. Too much bleed down pressure can increase piston crown temps at sustained high rpm, and lead to detonation and even seizure in serious cases. These are basic rules of thumb, not a hard and fast rules, so testing is gthe only way to know for sure. Here's something you should read to better understand two-stroke tuning : [url]http://www.eric-gorr.com/techarticles/basic_two_stroke.html[/url] [/QUOTE]