I have a 86 and a 90 with a spare engine. I have gone to air pods , rejetted and raised the needles on both with after market exhausts. The 86 is set up for serious offroad and has more than enough power. However I have the 90 set up more for street and fire roads. I want more power on the 90. I was hoping to put a 11.5:1 piston and use the stock cam or maybe a stage one. I am a little concerned about heat. I was wondering about what kind of power improvement I could expect for my efforts. As for as a KTM too much money and besides Its more fun to beat the new bikes with my old 27 year old xt. thumpthump.
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