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Discussion Starter · #1 ·
I just rebuilt my 660 after it threw a rod and busted a baseball size hole through the cases. So I thought now is the time to go all out. Here's what I did to it. New cases of course, hot rods stroker crank and rod, bored to 101mm with wiseco 11:1 piston. Hot cams stage 2 cam and ported head with kibble white double springs. Dynatek fs cdi, custom air intake and exhaust. It also has a machined sheeve and electric fuel pump. I sent my info to 6sigma jet kits and they sent me a kit that they recommended. They gave me four main jet sizes from 170-185 a new pilot and some other things to increase throttle response. They suggested starting with the 175. So I did. I've been running it about a week now and it runs great. It seems like it has more torque but it just seems a bit sluggish also. Just doesn't have that rip it response that I expected. The AF screw is at 2 1/2 turns out. My question is do you think the 175 is too much fuel making it feel a bit boggy? What are your suggestions for the engine work I have described above? Anyone have the same work done? Thanks for reading.
 

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the only real way to be super safe is a air fuel meter guage , you might want to consider one makes tuning through the entire power band a breeze
 
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