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YZ-80 has the throttle locked down. Son tried

Son has a YZ-80 and the throttle locked down. Can't twist it at all. Is there an adjustment?

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Is there a small thumbscrew on it, sometimes the have limiters on em to make it only go so fast. Otherwise, take the twistgrip apart, see if the cable is locked up, lube the grip and cable until all is free

Posted on Jun 17, 2009

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2001 vmax My throttle has alot of play in it, which I can adjust, but when I get the bike warm, it won't stay at an idle. The idle will creep up to about 2500 rpm. Almost like the throttle cable...


Try lubing your cables and throttle mechanism first. Do your adjustment when the bike is warm. It sounds like you're making one of the cables too tight.

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I changed my grips and in doing so my throttle cables have moved. the idle is loose though the throttle is not bad. was wondering how to adjust cables.


There should be an adjuster in each cable just below the throttle assembly. Push the adjuster cover up to get to the adjusters. Loosen each adjuster lock nut. Adjust the throttle cable first. Adjust it until it has just a bit of freeplay in the cable. As you attempt to twist the throttle, you should feel a little freeplay before you feel the throttle start to open. Then adjust the idle cable the same way. When finished, lock the lock nuts so the adjustment doesn't change. Now, twist the throttle wide open and release it. The throttle should snap closed. If it doesn't, you may have to loosen the two bolts that hold the two switch housings together and slide the assembly down towards the end of the handlebar about a quarter of an inch. Try the throttle assembly again at half throttle. It should snap shut. If not, continue until you find out why. If the throttle does not work correctly, loss of control of the machine could result and the rider could be injured or killed. Make sure the throttle works properly.

If you move the throttle switch housing down on the handlebar, check the rear brake light. If it is on continously, you must move the front brake master cylinder down against the switch housing. Loosen the bolts and slide it down towards the switch housing as far as it will go.

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1 Answer

2000 Yamaha YZ 80 poor idling


Hi, Shaundavies6 and the usual suspects are:
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5. Loose low-speed jet.
6. Plugged low-speed jet.
7. Contaminated or plugged low-speed circuit.
8. Enrichner valve/choke not seated or leaking.
9. Multi carburetors out of sync and need to be balanced.
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the screws on the carb are for idle speed , and air mixture, the air mixture it underneath,but it really only affects mixture at idle speed.
you may need to try raising the slide needle, or go up a size in the main jet, do one at a time and keep notes about the changes and results

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1991 yz 80 won't run with choke off.


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I have a 2000 yz 125 and it would start. i have


  • Start with a new spark plug. Do you see spark? If not, check the side stand kill switch. It kills the engine so that you don’t start out with the side stand down. If broken or out of adjustment, it would kill the spark. Check for a broken wire at the side stand switch and coupler. Try moving the kill switch by hand. If that doesn’t work then wire a jumper around the switch to bypass it.
  • Drain the Carb then refill it. Only twist the throttle one time in ten kicks. Extra gas pumps in on every twist of the throttle. Twist too often and flooding happens.
  • Check the fuses. How good is the battery? Is the handlebar kill switch on? Is the Neutral light on?
  • Check the operation of the ignition switch and all kill switches with a volt ohmmeter. Check the wiring harness. Did a wire come unplugged? Are all wires clean and with solid connections? Any abraded or pinched wires? Is the bike in neutral and the neutral light is lit up? If no neutral light, check the neutral switch and neutral switch wire on center casing. If still no spark, get CDI system and coils checked at the dealers shop.
  • Got gas and is it turned on? Clean air filter?
  • Carb, head and intake manifold mounted tight?
  • Does the carb intake manifold have reeds? What condition are they in?

Aug 07, 2009 | 2003 Yamaha YZ 125

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Honda 1300c backfire through carb at wide open throttle. I have open up the exhust and rejetted the carb . the bike will run fine up to mid throttle or 65 mph but if you accellerate hard or go to wide open...


Try balancing ans syncronising the carbs.
BALANCE THE CARBS
Turn the throttle screw on the LEFT carb one half turn inward. Now start the engine and get it warmed up. With the engine running, remove the RIGHT spark plug wire. Adjust the idle speed on the left carb to the point where the engine just can't quite stay running and dies. Now put the loose spark plug wire back into place.

Now turn the throttle screw on the RIGHT carb one half turn inward. Restart and rev the engine. Next, remove the LEFT spark plug wire. Adjust the idle speed on the right carb to the point where the engine just can't quite stay running and dies. Now put the loose spark plug wire back into place.

Turn the idle screw on each carb EXACTLY ONE QUARTER turn outward and restart the engine. The engine will be probably be idling very fast. Adjust both the idle screws equally from this point to get to the desired idle speed.

SYNCHRONIZE THE CARBS
Remove the air filter and rubber fittings to allow you to see into the throat of both carbs. You may need a mirror to see inside. You need to be able to see the slides go up and down when you twist the throttle. Now turn the fitting where the cable goes into each carb such that there is just a bit of slack in the cable, 1/16" is plenty. Lock ONE of the cable adjusters down tight. All further adjustments will be made on the other carb.

With the motor turned off twist the throttle very slowly while looking at the slides. Both slides need to begin lifting at the exact same moment. If the slides don't raise at the exact same time then slowly twist the throttle until the locked adjuster slide just barely starts to move. Hold the throttle still and turn the adjuster on the other carb so that the slide on that carb just barely starts to move also. Now recheck the slide movement timing. Do this process until the slides on both carbs begin to raise at the EXACT same moment. Lock down the loose adjuster and re-check the slides.

Please rate this solution. Thanks!

Mar 30, 2009 | 2004 Honda VTX 1300

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