20 Most Recent Yamaha 2007 Big Bear 250 Questions & Answers

See professional technician!!!

check your fuse?

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.

Do the nut up until the wheel stops spinning, then back it of 1/2 to 3/4 of a turn, the nut should still be contacting the washer, fit the split pin from there, the wheel should spin freely.

Hey Anon, this is NOT something to "try and learn" how to do..find a professional that is will to tutor you when you do this for the first time! It COULD save you A LOT of $$$$!!!!!

If you have good spark then it's most likely a fuel issue, anything off of idle is dealing with the main jet and metering needle, clean jet and check needle for excessive wear.

Check the fuel flow through the tank valve. There are screens inside the tank that may be blocked and restricting flow.

.004 intake .005 ext

must hold brake, use the foot brake!

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