Question about 2004 Yamaha YZ 250 F
Bike will not run if the choke isnt on. in other words it starts then as soon as you push the choke in it stalls please help!
You will have a carby problem. When the choke is one, and different fuel circuit is used. When you turn off the choke, you go back to the idle circuit of the carb is used, when under throttle, main jets kick in. You probably have a blockage in one of these circuits. Strip the carb down, clean with carby cleaner, blow out all air circuits and jets with compressed air, then setup the idle mixture and tick over speed. Always work with fresh fuel, and drain off, discard any fuel older than a couple of months. It goes off, and turns to a gel like substance that blocks up your carby. Hope this has explained your problem. Happy to talk to you more about it. A FixYa vote is a great reward for for my time taken to explain this to you. Cheers
Posted on Feb 08, 2009
Your low speed jet is pluged. You will have to remove the carb then remove the screw in the float bowl. You will see a main jet and a pilot jet. You will have to remove the brass plug that covers the air ajust screw. Then turn it in to find out how many turn till it bottom out. Then remove the screw and take carb cleaner and blow out all passages.Then reinstall all jets. Hope this helps.
Posted on Feb 16, 2009
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Posted on Jan 02, 2017
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