20 Most Recent Yamaha 2004 Big Bear 400 4x4 Questions & Answers

Sounds like the carb may not be completely clean...Did you get the GENUINE OEM carb??. When someone tell's me they replaced the carb (why?) .. I have been repairing motorcycles and ATV's for 45 years. only replaced 3 carbs in that time frame..ALL the others I was able to clean and repair...- I get the feeling someone is guessing at how to fix an underlying problem?? Did you use all new OEM gaskets? Did you remove the piston to clean it ( bead blast the ring lands?).. is the piston on in the correct direction??. rings on correctly? .. hone the cylinder?? .. check the valves for leakage?.. All bolts/nuts properly torqued?, ..OK.. as you can see there are many variables that need addressing before any kid of accurate assessment can be made!! My suggestion is to find a competent factory trained mechanic and pay him for his service!!

think you have to disconnect the differential and move it forward till the shaft drops out

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

Hi ! for a free wiring diagram, please visit the website below. If you need more information about a specific electrical issue you can reach me at [email protected]. http://www.motorpartstore.com good luck and have a nice day.

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!