99 rm125
comic sansMS
we have a 99 rm 125. It has a fmf topend pipe, v-force reed cage, phatracing head, 52 tooth back sprocket. After a drag race with a 05 KX250f that beat it by 2 lengths , I read Eric Gorrs site about the susuki exhaust valve. I cleaned the exhaust valve and raised the exhaust port almost level to the height of the exhaust valve inside the exhaust tract and gave the roof a rounded shape intstead of flat .Aproxx 3-4 mm of material was removed. The inside transfer port has a dip in the wall which i filled with expoxy to redirect the flow away from the exhaust port. This is something I learned from Mac Dizzys web site. I used the small chamber supplied with the Phatracing head after this work and have aproxx 175 lbs cranking pressure. After all of this , the bike pulls everywhere with no dead spots or sudden hits. It feels barky of the bottom. I played with the exhaust valve adjustment on the left side of the cylinder. I backed it off some to ease the power hit. I prolly need to study a suzuki manual to see if there is a set tension on this but we adjusted it for a smoother power delivery which is most peoples complaint with a 125. I have to wonder if most people would take the time to learn about 2 strokes instead of just buying a 4 stroke , they wouldn't need to be buying 800 dollar exhaust systems.