Rear gear recommendations???

[Flash68]

Wow. That engine is flat until 3k... ??



The 3.90's would still kill the first gear ratio. 11:1 is pushing it. Afterall you are only looking at a 250 RPM difference from 3.73 to 3.90... but mechanically, its 4/10ths in first and almost 1/10th in final.

Coin toss...

Yeah that dyno graph just doesn't seem right compared to what I have seen. The cam in it is not huge (244/252 dur @ .050, .620 lift, 114 lsa) and the heads are well-ported Victor Jr 215cc heads. Any idea why the lack of low end power?? The smaller/more boost pulley having too much lag in the powerband?

Anyway.. so the 3.89 would render 1st useless. Would this lack of low end power my motor seems to have help offset that at all? Or is just a matter of needing to go from 1st to 2nd right away because it just runs out of room, so to speak?

Also, FYI I have my tires and they are 26.65" tall.