Question about K and N Yamaha Big Bear Yfm350fw Air Filter

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Clean out a yamaha big bear carburetor

Ethanol in carburetor

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Remove screw or large hex head plug in bottom of carb..drain and replace screw or plug.. . A K&N must be clean, lightly "oiled",, and dry..

Posted on Apr 13, 2014

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Posted on Jan 02, 2017

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2005 Yamaha Big Bear 400. How do I replace rear brakes?


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Nov 03, 2015 | ATVs

1 Answer

What all can cause gas to run out the carb overflow line.


There is a bunch of things including, Hole in float, Dirty gas has left deposits on the needle and doesn't allow a complete shutoff, A damaged needle or seat, If carburetor has been taken off the float setting could be off, gas breaking down leaving a deposit on the needle or seat. Usually can be cured with a good cleaning and a new needle and seat. Check float to be sure it doesn't have a hole in it. If using 10% ETHANOL. fuel the fuel can be damaging your carburetor. I have had it eat a hole in the bottom of one of my carburetors so it does happen. I do not use ethanol fuel in any of my 4x4's anymore. May be more but good cleaning is needed.

Mar 13, 2015 | Polaris 2008 Sportsman 500 H.O

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I have a yfm25bw big bear 250 Yamaha it wont start, has a very weak spark, back fires sometimes. I have changed the coil , but still the same ,good it be the cdi unit ?


Most newer engines use an electronic ignition system, if the spark is weak verified at night (in the dark) by removing the spark boot and watching the arc jump onto the engine block, then this could be your problem. Otherwise, you have a carburetor issue which is very common in ATVs. Rebuild it using a complete kit to include a float and throttle spring... replace dog eared screws, if there are any. Ensure you put the keeper clip on the correct groove on the needle valve and be careful when bending the float arm as they break off easily... making them useless.

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1 Answer

What are the carb adjustment for a 98 Yamaha Big Bear 350cc atv


http://www.partzilla.com/parts/search/Yamaha/ATV/1998/BIG+BEAR+4WD+-+YFM350FWBKC/CARBURETOR/parts.html this page shows the carb all pieces including air mixture pilot and main jets

Oct 07, 2014 | ATVs

1 Answer

1998 big bear350 high idol want adjust down


did you set the float height correctly? It still might be flooding some also.

Sep 30, 2014 | K and N Yamaha Big Bear Yfm350fw Air...

1 Answer

Atv big bear 350 won't idle after cleaning


sounds like your mixture was leaned out because ur filter was cloged up ...making it run rich so was adjusted by screwing air screw out, now uv cleaned it, adjust it to make mixture richer by screwing back in until runs smotherly

Sep 08, 2013 | K and N Yamaha Big Bear Yfm350fw Air...

1 Answer

Yamaha Big Bear will not crank and start. replaced solenoid, battery, cleaned carb ... new plug, traced all wires. help!


Smack the starter with a hammer or a wrench if the starter isn't turning over then it's bad if it does crank and won't start your CDI may be bad you've all ready replaced the little stuff sounds like it your starter is bad hope it not CD I if it is replace the stator as well and buy them on ebay it will save you a ton of money

Apr 30, 2013 | RTO 200cc Full Size Four Wheeler ATV

1 Answer

02 Big Bear 400- Hi-idle & backfires while running. Tried cleaning carb & air filter, drained bowl & cleaned with carb cleaner. Could there be aproblem with the choke.


Sounds like the carb could use a cleaning and setting by a professional...install a new plug and a new air filter.. AFTER the professional carb cleaning and setting.,,do this and repost

Oct 16, 2010 | Yamaha 2004 Big Bear 400 4x4

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