I brought my foreman 500 06 model to the dealer to get jetted.
Everything sound good and it ran well my main jet was 170.
I went riding in the mud and it seemed, if and when i would get stuck in the mud and i would run at high RPMs WOT, after i let off the gas, it would come an idle and then kill. Also some times it would almost sound like it was back firing or miss firing. I went down to 160 main jet and now it sound good and runs good. The spark plug has that brown color where it was orignally white. It was all black at 170main jet. I don't understand, from what i discribed did i jet it correctly now? and why does some people have 170 main jet, are all engines different in there own way. I live south Louisiana, so you know i live below sea level. help somebody.
Some people do run 170 mains but IMO I think its a little too much for the bike. I run a 165 on mine and I have the 499cc vs the 475cc. A 160 will work fine for you but you may get a little more with a 165 but it probably won't be that noticeable.
What jet size comes stock with the ES model? I noticed my plug was extremely black (rich ) when I pulled it out when I adjusted my valves and was wondering if I should adjust the A/F mixture or not. The thing runs fine as it is but I don't like it running rich if that's the case.
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