smaszczak Posted April 29, 2014 Share Posted April 29, 2014 I have a simonini mini 2 plus motor with a bing 84 carb and my motor appears to be running hot. I have a 155 main jet in my carb and I am wondering what main jet others have with a similar setup and I increasing the size one notch (160) will help bring my temps down. Any input would be appreciated. I have cleaned my head and piston and actually just ordered a new cylinder and piston setup. Quote Link to comment Share on other sites More sharing options...
Lee Ken Sachs Posted September 22, 2017 Share Posted September 22, 2017 adding more fuel will lower the temp. so yes, going higher in jet size from 155 to 160 will cool the engine. and u can also try, moving the needle lower, to make richer in mid range as well as will make richer in the top end. Most needle are 3 notches. Clip to the lowest notch so the needle come out the furthest. I would do that before a jet change. That simple 2 millimeters will make a difference. Quote Link to comment Share on other sites More sharing options...
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