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Hey fellas, I am looking to build my son a kart for dirt oval racing in the 250 class. Its mostly 4 strokes right now but have just allowed 2 strokes to come back. I have heard the 2001 cr250 bottom end with 89 top end but am not to familiar with the 250 as back in the day we raced 125's and 500's. Also heard good things about the YZ's but not familiar there either..
hi guys and gals, i got a 2014 yz125 that i just burnt the rings on last wednesday. itll start and run but compression is low. it has an athena 144 big bore, and the motor was completely reworked by lynks racing. now, my issue is that it was still smoking like you’d expect of a two stroke. i am running 40:1 with 89 octane non-ethanol and interceptor oil by amsoil. usually i wouldnt think its abnormal to need to rebuild a 2 stroke, especially when you’re keeping the throttle in the top 25% for most of your practice... however... there was only about 12 hours on the top end. i don’t mind buying rings for a rebuild, but id like to get more that 4 practices out of the bike before the top end goes. what do y’all suggest i change? premix ratio, fuel, oil? btw, im also using about 2 cups of VP 2t to every tank of gas and keep the air filter clean after every ride. thank you for any advice you can give me! i love this bike with every bit of my being and would just like it to last a little longer