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Discussion Starter · #1 · (Edited)
Been considering potential upgrades for over the winter and am finding some conflicting information regarding throttle bodies.

In an old post from Activ3 (dhm) he states that he did not notice any substantial difference on the dyno between the 24mm and the 26mm TB on a 147cc setup, but CJR is claiming up to a 1hp gain with a 27mm TB (with corresponding upgrades) on a stock bore.

So how's everyone liking their 34mm koso TB on a stock bore? Was there a noticeable tradeoff in low rpm torque? Any dyno graphs?

Ultimately my goal is to add a little more top end power so I can pull up to 10k a bit stronger. So im thinking of doing a big valve head and matching TB.
 
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