tried changing the cam? i ran a 750 on a 355 and had no problems with it...your secondary jets may be too large aswell..but check your cam 1st.
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El Pendejo Loco
2002 Suzuki Hayabusa
1507 "dry" block
Brocks megaphone
Spencercycle 10" swingarm
MPS auto shifter
Hays convertible clutch
Yea, that about sums it up...
