You need to set the fuel screw (on the bottom of the carb between the float bowl and the intake manifold) which is usually up in a tube cast into the carb body. I want to add something about pilot screws, idle, mixture screws that will help many understand and tune the pilot and idle, this is from HMF's website: BEFORE you do ANYTHING involving jetting or tuning do this FIRST. Hopefully this information will help some of you to troubleshoot your drivability issues. If your engine is difficult to start up and idles very erratic, and revs up and runs smoothly at higher RPMs, then chances are your cam is retarded a tooth or two on the sprocket or your valve clearance is out of spec. Polaris - 42mm Mikuni BSR carb - Hate to be a dummy, but what does BSR stand for I can find referrences to HSR on Mikunis site, but cant find a thing. Juice up your bike with this race-winning gear today at Summit Racing Show Less. As a guide, the chart to the left indicates equivalent sizes based on the diameter of hole in the jet. If your engine starts up and idles fine, and has troubles revving up and falls flat on it's face, then chances are your cam is advanced a tooth or two on the sprocket or your valve clearance is out of spec. Summit Racing carries a variety of Mikuni parts, including Mikuni carburetors and Mikuni carb parts, like Mikuni jets, pocket tuners, rebuild kits, valve and seat assemblies, vacuum fuel pumps, float bowl screws, and more for Suzuki, Kawasaki, and Yamaha. 167.5 178.7 180 170 181.3 172.5 184 185 175 186.7 177.5 189.3 190 180 192 182.5 194.7 195 185 197.3 187.5 200 190 202.7 Flow rates based on size markings of Mikuni and DynoJet jets are not comparable. So if you have just rebuilt your engine and are having driveability issues, and you did not touch the carbs, chances are your cam timing is off or your valve clearances are out of spec.
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