Sounds like your engine is flooding when in the trim down position. You might need new fuel jets in the carbs.
SOURCE: won't idle steadily
Check the rubber boot that joins the carby to the engine to often have seen the hose clamps over tightened therefore creating a split in the rubber letting to much air in giving the rough idle eventually you wont be able to start it at all (have a good thorough look inside an outside of boot doesnt take much)
SOURCE: 2002 YAMAHA BANSHEE WILL NOT REV
I have a 2004 banshee at the yamaha dealer being worked on.It would not run when i took it up there they cleaned the carbs and put it back together it will start but when you rev it, it holds itself wide open and wont shut down unless you pull the plug wires.they also checked the floats in the carbs said they where ok. they think it is a vent issue with the gas tank or the fuel shut off valve.IS THAT POSSIBLE
SOURCE: 330 Magnum bogs down.
NO! Check the boot between the carb and engine. Very common problem for aged rubber is non-visual cracks. Pull it off and check the boot by kneeding it and looking at it under a light.
SOURCE: 2001 yamaha ttr 250, starts, idles ok, bogs at acceleration
Has the bike been stored for any long length of time?
old fuel in the carburetor will turn to a varnish like residue blocking the jets,or possibly water in the carburetor.
Testimonial: "The bike was not stored and was ridden regularly, but it still sounds like it could be the carburetor. Thanks for your insight."
SOURCE: Yamaha 2001 ttr 250. Bogs above half speed, under load
I have the same problems with my 1999 TTR 250, were you able to find out anything?
Walt
[email protected]
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