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Starts but will not rev up

I have check spark,fuel flow,air filter

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  • Motorcycles Master
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What bike is it

Posted on May 03, 2015


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1 Answer

Cranking but not starting


Go back to the basics. Spark, fuel and air. Pull spark plug wire and hold near plug while someone turns car over. Spark should jump from plug wire to plug. Next, double check fuel supply, filter, etc. and last check air filter for flow, if in doubt leave filter removed and attempt starting procedure. Last call a qualified mechanic.
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32LC trimmer will start and idle but bogs when trying to advance throttle. I can not get it to rev up. I put fresh fuel mixture in it, changed the spark plug, cleaned air filter, even purchased a new...


Did you try cleaning the carburetor before installing it? It may have factory oils and greases that are obstructing fuel flow.

If it runs fine at idle but bogs down when reving, then you are either not getting enough air or not getting enough fuel.

Have you notices any black smoke from the exhaust when you try to rev it? If so then you are running too rich and aren't getting enough air. You may want to check the path of air travel for other restrictions.

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Toyota Echo Automatic 2000 model. Stalls at low revs and shudders when taking off slowly. Replaced spark plugs fuel filter and air filter didnt seem to make any difference. Any ideas?


Sounds like a fuel problem. Check fuel pump and fuel rail. Do a fuel line pressure test. Try cleaning inside of throttle body really good and also the TPS at that location. There's many things that can make a car run bad. 

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REPLACE THE CAMSHAFT !!!,,, HAVE A LOOK AT CAMSHAFT , EXHAUST LOBE IS PROBABLY WORE RIGHT OFF....

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MY YZ250 WONT REV PAST 3/8 THROTTLE. I NEED HELP!!


It does sound like an ignition timing problem, but could also be a breathing issue, air flow in or exhaust flow out could be restricted i.e.:dirty air filter, excessive carbon build up in exhaust pipe from burning too much oil or rich fuel mixture.
possibly and more likely some junk got into your fuel system and partially plugged up the main jet in the carb, -or has the needle on the slide been moved? The little circlip at the top of the needle, if it has one.
1.Replace the spark plug, check gap, check spark, it should be bright blue and fat.
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hi there have you check the air flow system (pipes for blockages,pipes that may have split etc) sounds if it is air flow problem.

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1 Answer

IT IDLES HIGH AN WONT REV UP


Change all the filters (fuel and air). check and see if all your spark plugs are firing or just change them. if it is fuel injected make sure your injectors are working. Hope something there helps get it running good.

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