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Yamaha Blaster no idle??


SunLrider

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there isn't much to adjust on that carb. You still have the TORS system on it? most do. It's a box atop the carb that throttle cable goes through.

If this happened suddenly then does it run OK otherwise?

I would check 3 things first:

Take the hood off and make sure the TORS box [one of the little black boxes] is plugged in and the connections are clean. It mat think you have fallen off.

Make sure your throttle control is firmly mounted so it grounds to the bars. It shouldn't be loose.

Fire it up, have someone keep it running, and adjust the only screw on the carb slowly.....it's a mixture screw so count which way you turn it each way.

let us know what you get OK?

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Most likely a vacuum leak. not good for the engine! as it leans out it will speed up until it explodes...

does the throttle work smoothly? the slide is not stuck?

since it happened suddenly take a close look around the bottom of the barrel, ie, where the cylinder sits on the case. there's a paper gasket there and sometimes they will suck a chunk of that into the engine, creating a massive air leak. Make sure your carb is on tight too and you intake to head.

have any spray brakekleen or wd40? start it and spray around the barrel and intake...if the engine sputters, you found the leak. but dont leave it running wide open for long! you don't want o seize it.

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does the throttle cable go thru it?

if so, back it off until you have just a little free play in your throttle control.

Oh, the factory jet on the side is idle speed adj, not mixture.

factory book says pilot air screw 1 and 1/2 turns out.

throttle cable free play should be .18 to .24 inch [1/4 inch max]

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is the hole on the RH side? when you are sitting on it? are there threads in it?

while it's running put your finger over the hole and if the engine sounds changes then you are missing something. if not, still tell us if there are threads in there.

Most of the blaster carbs were also used on motorcycles and they have a port on the RH side that is cast in the body for a jet the blaster does not use.

good to hear it is running now-

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