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My wr400 99 modle starts on choke but won't idle. Have have had the caburettor done by yamaha. The bkke runs fine through all the rev ranges except idle. Have also changed spark plug. Would be much appreciated if anyone has got any ideas. Thanks.

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

  • 126 Answers

SOURCE: wont run /idle

i'd start with removing the carbs and giving them a thorough cleaning as when bikes sit for so long, the carbs begin to get gummy/varnished from the old gas.

check for blocked holes in the pilot jet & main jet and look for "hard & dried up" gas in passages. be careful of the float bowl gasket as to not tear it or you will need a replacement.

Posted on Mar 06, 2009

  • 3567 Answers

SOURCE: I have a Yamaha Riva 50cc. It starts and idles but

Remove and clean the carburetor. That will probably fix the problem.

Please rate this solution. Thanks!

Posted on Apr 02, 2009

  • 9 Answers

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)

Posted on May 22, 2009

  • 3567 Answers

SOURCE: yamaha blaster runs but wont rev

ALWAYS have a fire extinguisher on hand when working on carburetors.
Remove the water trap bowl at the bottom of the petcock, (gas valve). Is there any water or trash in the bowl? Drain a cup of gas from the tank. Is there any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).

Drain the carburetor. There should be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Install a new stock NGK spark plug and try to start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.

Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb.
Before putting the slide back in the throat of the carb, move the clip on the jet needle one notch lower. Put the rest of the carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine. This process should get you back on the road.

849880b.gif Please rate this solution. Thanks!

Posted on Jun 21, 2009

  • 174 Answers

SOURCE: Pressure washer with 5hp Honda will ONLY run with choke on

It sounds like it has been tipped or too much oil has been put in. This would explain the oil in the air filter. First check the oil level. Then you need to clean the oil out of the carburetor. It is dirty or plugged and that is why it only runs when choked. You can try a spray-in carb cleaner but the best thing is to remove it (if you are handy enough) and soak it in varsol for 24 hours. Good luck

Posted on Aug 11, 2009

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