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max rpm’s about 12500. that’s the peak of the power curve but it can be rev’ed to 14k.
temp between 140 and 160.
jetting with a 158 main jet should be safe. watch the plug and exhaust color. black is too rich and white is way too lean. Look at some of the jetting programs out there.
power valve should kick in around 7000 rpm’s.
Down load the FR125 Operators manual. It’s good, just don’t believe the jetting chart.
LAD Specialties customer / tony kart / rotax / kt100