Question about 2005 Yamaha PW 80

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Yamaha pw80 wont stay on if choke is turned off

Can get bike to start easily but wont idle or run if i turn the choke off

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  • Yamaha Master
  • 3,287 Answers

It may be the air filter - try running the engine with it removed to see if it is too dirty to allow enough air into the carburetor

The carburetor may have varnish deposits clogging jets / interfering with mechanical operation. Clean the carburetor thoroughly with Gum Out or similar spray type cleaner as per the directions on the container. Spray any carburetor linkage on the outside, too.

Replacing or cleaning the spark plug may improve running too. Be sure to check and regap as needed before reinstalling.

Hopefully, one of these suggestions will solve the problem. Good luck!

Posted on Jan 04, 2013

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6 Suggested Answers

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Posted on Jan 02, 2017

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HDTV GURU
  • 261 Answers

SOURCE: motor bike wont rev above idle weth choke on

This to me sounds like you need a carb cleaning. If you have let the bike sit for an extended time the carberators maybe clogged or gummed up. This has to do with the new gas that is out there now. It is cheap and with the introduction of Ethanol alcohol now it is even worse on being stable for long periods of time. I have seen fuel go bad in as little as 3 weeks.. One quick check you can do is open you fuel tank and smell the fuel. IF it smells like varnish it is probably bad. You can drain the tank and add new fuel and that should solve your problem. Keep in mind, that the carbs need to be drained as well to get the old fuel out of there also. Make sure you have a battery charger going when you start crankin that puppy, because you will need lots of extra juice to get that baby to fire up. If it is starting now and runs on choke, that means your idle jets are clogged. Best repair is to remove carbs and clean idle jet. Unless it is fuel injected.
Let me know how that goes and we can proceed from this point. I am a certified mechanic from MMI as well as a HDTV GURU. Smiles. have a good one.

Posted on Dec 07, 2008

  • 3567 Answers

SOURCE: 94 pw80 floods with 2cycle oil

Sounds like the automatic oiler has gone berserk. Personally, I would save the repair bucks and just drain (and remove if you want to), the oil tank. Then just do like most of the other bikes do. Add four ounces, (32/1), of 2 stroke oil to each gallon of gas.

If your model is an air cooled bike you might want to remove the head and flush the crank cavity. De-carbon the top end while you are at it. If water cooled , remove the carb and manifold and flush through the intake. Both methods are best done with the engine out of the frame.

Please rate this answer. Thanks Jesse!

Posted on Mar 29, 2009

  • 1 Answer

SOURCE: Yamaha TTR 125 L won't idle

The problem is that your idle is adjusted to low just like mine, you need to adjust your idle

Posted on Aug 04, 2009

  • 3567 Answers

SOURCE: ttr90. starts easily and runs smoothly on choke.

Remove and clean the carb. Sitting around can let the gas evaporate. This leaves a varnish residue in the carb. Remove the carb then remove the float bowl. Use a spray carb cleaner to spray into the jets and carb circuits. Remove the throttle screw and air screw and spray into the screw holes. The low speed idle circuit is the problem so concentrate on the air screw hole. Put both screws back where they came from and turn each until it LIGHTLY seats. Now back each screw one and one half turns. This is the factory setting. If the bike still does not want to idle, there is still some varnish or trash plugging up the idle circuit.

Posted on Sep 20, 2009

tellme2
  • 137 Answers

SOURCE: yamaha 2003 wrf 250 start

hey m8,, sounds like u have a bit **** in the carb floating arround the jets m8,, wen its warm and bein used the dirt will flow round the carb untill left overnight to settle ,,that will block the fast idle jet,, need to take the bottom of the carb off,,ie the float bowl wip out the jet that the needle sits in to,, this will have about 4 little holes threw the stem of the jet, poke a pin or needle threw them and the main jet,, untill u see light threw the holes,, clean out the float bowl,, that should sort it,,

Posted on Jan 01, 2009

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When choke is off wont idle


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7. Idle adjusting screw set too low.
8. Air/fuel mixture screw set too lean.
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