2008 Yamaha venture motorcycle carbs were cleaned by a yamaha shop 2 months ago. I have the same symptoms again (will only run on full choke and dies when throttle is opened). I can't believe that the bike needs a carb cleaning again, it went 54000 miles before the first one. Could it be the fuel pump?

SOURCE: yamaha DT 125 R intake leaks

Pull the heads and have the intake manifold mating surface planed.

SOURCE: 2003 yzf450 wont run right?

recheck pilot jet & pilot circuit.also check compression

Murtaza Akberali Versi

• 767 Answers
• Posted on May 12, 2009

SOURCE: 2003 yamaha wrf 250 carb problem

(1) You will need to adjust the float pin to get the correct amount of fuel in the float chamber of the carburator.
(2) You will also need to set the air-mixture screw , but before you do tht remove the spark plug and see whats the condition of it, is it black , is it brownish, or is it whitish.
If its blackish = means rich too much of fuel, if its browinsh= ok, if its whitish = its too lean.
(3) As for hesitation, check the needle at carbs piston on the accelerator cable, and blow the main jet with high pressure.
(4) Check too the spark plug gap and if its as per the manufacturers specs.

Hope this helps!

SOURCE: Won't idle without choke

The pilot jet controls the air/gas fuel mix at idle . If the jet gets plugged up not enough gas gets to the emgine at idle. You will need to remove the carbs and float bowls and clean them, paying special attention to the pilot valve. Count the number of turns to remove the pilot screw and replace the same number of turns then turn counter clockwise 1/2 turn.

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SOURCE: yamaha yz 125 1994

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