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Won't rev-up It wont Rev-up and it will only run with choke on and throttle wide open?

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Engine is starving for fuel. Either it is out of fuel, or the passages in the carburators are clogged and not allowing fuel to pass properly.

Posted on Jul 27, 2013

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1 Answer

When I start the engine the engine revs, like the throttle is wide open. I checked the cable, and the butterflys they are working properly, What would make the engine rev?


Hello, is your choke cable/knob pulled out? If so, after starting push the choke knob into its seated position. You may need to do this slowly to prevent slalling the motor. Also a clogged or dirty air filter may cause the problem.

Oct 04, 2015 | 2002 Suzuki GSX 1300 R Hayabusa

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HY DOES MY YAMAHA BEAR TRACKER REV REAL HIGH WHEN IT STARTS


near carb base should be idle adjustment- turn it down and up with running and then put to where you want it

check to see if choke is on or cable is stuck

Dec 23, 2014 | Yamaha Motorcycles

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Carburetor problem?


check the setting for the auto choke and adjust the linkage with it.. Adjusting screw on the throttle butterfly that runs on the fast idle cam of the auto choke.

Feb 18, 2014 | 1985 Nissan Pickup

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50cc Scooter won't rev up, Keihin PD18J carb


my 50cc scooter will idle at first and rev very well but wont idle what can this be

Jul 08, 2012 | Motorcycles

1 Answer

1996 sportsman 400 wont idle. Had the carb cleaned by a "mechanic" after the bike took off wide open and driver was injured. He said the float stuck and he "fixed" the problem. Now...


I have NEVER heard of a float sticking and causing that issue. Sounds to me like the Electronic Throttle Control (ETC) on the right handlebar isn't or wasn't adjusted. There is a thumb nut on the throttle cable coming out of the ETC switch. Loosen the screw and turn the cable in or out to get 1/16 to 1/8 inch freeplay on the thumb throttle. Too loose and it won't idle, too tight and it will pull the throttle cable tight and rev engine. It could also be a carburetor issue if it runs with choke. Either the idle screw isn't adjusted or the pilot jet is plugged. There is a large thumb screw coming off the carburetor, turning clockwise will turn the idle up. Let me know if you need anything else, Daniel.

Sep 18, 2011 | Polaris ATV

1 Answer

Motor wont rev up when starting cold with choke on trys to run on idle but will not rev up


the motor wont rev high on choke.the motor is suppose to fire once on choke. then turn the choke off.pull the start cord and the motor should start and run.check that the throttle conrol is on full. it should run fine.

Dec 26, 2010 | Honda 8 HP Engine

1 Answer

Ok i just got a 2004 crf 70. i have taken carb apart twice and cleaned every jet ect... problem is when wide open it cuts out spits and spudders. I have changed settings on throttle cable and swapped out...


Could be that you need to go up one jet size.
When choking a motor, your richening the mixture with more fuel, less air.
So if you must choke it, you must need more fuel.

As for electrical. some bikes have a rev limiter when you hold the throttle wide open You may be reaching the rev limit.
A rev limiter with turn the power on/off the coil superfast, keeping the rmp at a maximum factory setting, and the motor breaks up at full throttle.
Some cdi's have and adjustment that you can set your own rev limit, or you can buy a cdi with no rev limit.
Hope this helps

Dec 09, 2010 | Honda CRF 100 F Motorcycles

2 Answers

2003 yamaha banshee it is very hard to start, when it finally turns on I have to hold the throttle if not it will just turn off,,


Have you check the choke position?
When you got it going does it rev up high immediately, if yes then you choke is stuck wide open.
Good enough?

Jul 03, 2010 | 2008 Yamaha Yamaha G5

1 Answer

When I rev the throttle it kills the bike. But


You carburator needs cleaning, or needs to be adjusted. Do you have fresh gas in the tank? Did you mess with the jets, or any adjustments on the carb? You're just not getting enough gas when you open the throtle, and having the Choke on will give you more gas.

Oct 19, 2009 | 2005 Honda CRF 250 X

2 Answers

Starts and then runs wide open.


SOUNDS LIKE THROTTLE NEEDLE STUCK OPEN CHECK THROTTLE LINKAGE STICKING OR RETURN SPRING

May 19, 2009 | Husqvarna Chain Saw 20" Bar

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