This website was made to help people make calculations for tuning to two stroke engines. You will find calulations and help to better understand how to make your moped stonger and faster. Please leave comments or send me an email at richardax@hotmail.com


Displacement cm3 49 RPM to analyze 7000 Exhaust duration ° 150 Ideal 150-175° (lower gives more range, higher gives more peak) Exhaust height mm 14 Note: Only the height uncovered at BDC. Not always the same as port height Exhaust width mm 25 Stay below 70% of cylinder diameter Exhaust square to mean ratio 0.785

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