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Message: [QUOTE="jaguar, post: 597728, member: 19340"] Yeah, I'd say that's a bit off. My KDX200 has exhaust port opening at 96 degrees after TDC (83 when power valve opens), and the transfer intake ports at 120 degrees. The following is from Eric Gorrs site and may be useful: Tuning for Specific Powerbands I've designed the chart shown below, to give you some general guidelines on different powerbands and the changes required to the individual engine components. For specific recommendations on your model bike, refer to the chapters on tuning tips. Component: Cylinder Head Low To Midrange: 9.5:1 compression ratio, squish band 60% of bore area Midrange and High-Rpm: 8:1 compression ratio, 40% squish Component: Cylinder Ports Low To Midrange: Exhaust port 90 ATDC, transfer ports 118 ATDC Midrange and High-Rpm: Exhaust port 84 ATDC, transfer ports 116 ATDC Component: Reeds Low To Midrange: Dual-stage or .4mm fiberglass petals. Compromise: Thick carbon fiber petals Midrange and High-Rpm: Large area 30-degree valve Component: Carburetor Low To Midrange: Smaller diameter or sleeved down carb (26mm for 80cc, 34mm for 125cc, 36mm 250cc) Midrange and High-Rpm: Larger carb (28mm for 80cc, 38mm for 125cc, 39.5mm 250cc) Component: Pipe Low To Midrange: Fatty or Torque Midrange and High-Rpm: Desert or Rpm Component: Silencer or Spark arrestor Low To Midrange: Short, small diameter Midrange and High-Rpm: Long, large diameter Component: Ignition Timing Advance timing Low To Midrange: Stock timing Midrange and High-Rpm: Retard timing Component: Flywheel Low To Midrange: Add weight Compromise: Stock flywheel Midrange and High-Rpm: PVL internal flywheel Component: Fuel Low To Midrange: Super unleaded 93 octane Midrange and High-Rpm: Racing fuel 105 octane [/QUOTE]

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