660' races

900cfi

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I was at some snow drags this weekend and noticed a 2007 attack racing in the 600 and 700 stock classes.Why are they allowed to race in these smaller classes?Just thought this was weird.The 1 attack was set up really good.
 
4 strokes buddy. This has been discussed a kazillion times in the past 3 years. They do it with dirt bikes; etc. Do a google search on 2 stroke vs 4 stroke & how they make power. My RX-1 had no probs in 1000 mod at Hudson bay! Your about 3 years behind in your question here cus it has been covered to death!!!!
 


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