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Message: [QUOTE="dirt bike dave, post: 1420888, member: 18302"] I'd be tempted to go Option 2 plus whatever you need to do to quiet the bike down for the trail. The smaller carb might help with low end anyways. In my experience with a KDX200 to 240, the jetting that worked best on the 200 was pretty darn close to what worked best on the big bore. Basically, the motor is sucking in harder, so it gets the extra fuel it needs. This is my way of saying the 80 jetting might not be too far off. If you ride it with the stock KX80 pipe for awhile, you will know what it needs in terms of a replacement. IOTW, if the stock pipe lacks low end, you can search for a low end pipe. [/QUOTE]