the quad is bone stock except for an K&N filter. Greg, It is common for the intake boot to crack on this model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aptor 660 Wiseco 9.9:1 piston, K&N filter and Full FMF Exhaust Turn the adjustment knob clockwise to increase the idle speed, or counterclockwise to decrease the idle speed, as needed to bring the idle speed to between 1,450 and 1,550 rpm. It also backfires through the carb before it dies. 02 Big Bear 400- Hi-idle & backfires while running. Please enable Cookies and reload the page. Never adjust your Big Bear's idle without first warming the engine. For a better experience, please enable JavaScript in your browser before proceeding. Thanks Hammer as soon as I get a chance to work on it I will be checking that out, I have got to get these transmission gear shift apparatus, and brake and throttle covers done before the natives get restless. It then does not idle well and stops running. tthis is my big bear 400 running i have it for sale you can see it on lexingtion craigslist. Sounds to me like your low speed circuit is plugged up. the next step you need to do is check the engine compression. Count and record the amount of turns needed to seat the screw. the exhaust turns red hot after a couple minutes. Join Yahoo Answers and get 100 points today. Do not stop the engine. I checked the boot, could not see any noticeable cracks or tears and the o-rings looked good. A forum community dedicated to Yamaha ATV owners and enthusiasts. For a better experience, please enable JavaScript in your browser before proceeding. Did you remove ALL the jets and clean all the passages? Could hte K&N be flowing enough air to rejet? Still have questions? Might wanna check that... Also check the fuel inlet into the carb...where the pin/needel thing on the floats raises up into. LoneStar, Wicked, Works all around, Web, Arias, Noss, DG, Douglas, etc., etc., etc.
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