650/X-2 jetting for stock 650sx with a single 38mm sbn mikuni?

McDog

Other Administrator
Staff member
Location
South Florida
Bought one with this setup. Stock everything except bored intake with mikuni 38. It is waaay off. Any ideas on a starting point for tuning?

Help a brother out.
 

McDog

Other Administrator
Staff member
Location
South Florida
It had a 62.5 low speed jet and a 107 main. It won't rev out to much over plane speed. No power. Smokes like hell. Starts fine. Good spark. 135 ish compression in both cylinders. Anyone? ....Bueller? ....Bueller? ....Bueller?
 
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WFO Speedracer

A lifetime ban is like a lifetime warranty !
Location
Alabama
My best guess would be a 70 pilot and 175 main, that may be a tad rich but better to jet from rich to lean than from lean to rich, I have never a single 38 mikuni on a 650SX
 
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