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Discussion Starter · #1 ·
What is the biggest most reliable big bore kit out.My freind has a 250r with a ct 310 kit.
We have drag raced many times and I always win till I hit fith gear.I just changed to a
15 tooth front sprocket.That should help my top end but now he is getting the 350 pro
kit.Any help will be greatly apreciated.
 

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Are you reaching the rev limiter in 5th gear?
 

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Discussion Starter · #3 ·
I was hitting the rev limiter with the 14 tooth soprocket in 5th gear now that I have switched to the 15 tooth it is a lot hrder to hit the rev limiter.I really love the way it pulls in each gear now.I do a lot of open riding.
 

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When it comes to speeds that high, getting in an aerodynamic tuck really really helps.

I assume you check your spark plug to ensure you're not running too rich, right? I haven't seen too many people run higher than a 152, that's why I ask.

Sorry that I can't help ya with the big bore kit.
 

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Big bore

1) Thumper Racing sells a 480 kit. You'll only need to resleeve.
2) Four Stroke Tech sells a 500, but you need to split cases for a modified crank.
 
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