I just installed an old Powroll 95cc piston kit (found on E-bay), in my 10 year olds CRF 80 did port work and valve job, advanced the ignition timing 2 degrees, stock cam, had a pipe already, and made adjustments to the stock carb. This thing now runs like it should I ordered 15 tooth front and 45 rear sprocket to try. My son only weighs 65lbs and it really rips with him riding. Hopefully this will be good enough untill next year and we buy a CRF150R! Ha I have a question: with the cylinder now very thin do these now run hot?