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You are watching: Yamaha big bear 350 carburetor adjustment

Hi all1994 substantial bear 350....Rerelocated and disassembled the mikuni btm carb to clean it out...reassembled...have a question reguarding the pilot screw setting (the one on the bottom of the carb)...does anybody have actually an idea what the factory establishing is for this is? ie...how many turns execute i earlier it out? additionally any helpful tips reguarding setting this screw appropriately would certainly be beneficial...thanks!Mike
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Start at 2-1/2 to 2-3/4 transforms out as a beginning point. Then start the engine and also check out exactly how it runs. Turn out the screw even more if engine runs cleanly at idle rpm. Keep turning out SLOWLY until idling becomes erratic. Then rotate needle earlier in 1/4 to 1/2 turn.If idling is erratic from starting allude, rotate in needle slowly till idling smooths out.
2003 Grizzly 66030" s/w Maxxis Zilla"s on Vision wheels (summer tires)27" s/w Titan 589 on stock wheels (winter tires)2.0 mm Primary ShimDalton Metallic Red Secondary SpringHigh Strength AxlesWarn 2500 lbs winchGrizzly 700 camera plate (no performance development, simply much better non-wearing slide design)
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2003 Grizzly 66030" s/w Maxxis Zilla"s on Vision wheels (summer tires)27" s/w Titan 589 on stock wheels (winter tires)2.0 mm Main ShimDalton Metallic Red Secondary SpringHigh Strength AxlesWarn 2500 lbs winchGrizzly 700 cam plate (no performance development, simply better non-wearing slide design)
whats the best tool to use to readjust this screw while the carb is on the machine? I cant even fit a small screw driver in to make adjustments
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I don"t have my Griz finimelted yet however on some of my other rigs via this same setup I made a unique tool for it. I took a 6 penny nail, flattened the end out via a hammer, filed the finish square then bent that end 90 degrees about 3/8 of an inch long. Good tool for your tool kit.
I just usage a flathead screw little it’s little enough to obtain under tbelow you don’t need to make a special tool if your out and about
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