Question about 2001 Yamaha Serow 225 WE

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Engine revs when throttle is closed and slows down when the throttle is open can you help me please

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You need to get the engine tuned from an expert mechanic as soon as possible.

Posted on Jul 11, 2009

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2 Answers

Twist grip throttle stuck at idle


Hi George. Brad may be right with his answer but there might be something you can do.
Does the throttle open/turn as it should or is it stuck in the closed position and will not turn at all?
If it won't move then it could be a seized cable, a stuck mechanism at the carb end or a twisted or kinked cable.
If it does move but the engine doesn't rev it could be a broken or disconnected cable.
On top of the carb there is a mechanism where the cable end fits and this is pulled to rev the engine. Have a look and see if there is a cable attached. There may be 2 on yours, one to open the throttle, the other to close it and snap the throttle closed which is aided by a spring. When you open the throttle does this move? Yes, then the cable is doing its job. No, then the cable is not operating properly and is either broken or has come away at the throttle end and will need looking at. With the engine idling try to move the mechanism manually and see if the revs increase and then drop off when you release it (you might need a screwdriver to reach in to do this). If it revs and drops back down as it should, then the mechanism is operating as it should, If it doesn't alter the engine speed despite moving back and forth then it has detached itself in the carb and that will require investigation. At least if the cause is found it could be an easy fix, or cut the mechanics costs by pointing him in the direction of the fault.

Sep 22, 2015 | 2007 Suzuki Bandit 1250

1 Answer

Revs high when i change gear


Is it possible the clutch pedal is interfering with the throttle? Start the engine in neutral and allow it to idle. Press only the clutch pedal down and see if this increase the engine speed. If it does speed up the engine and slows back down when you release the clutch then somehow this operation is where your fault lies. If it doesn't alter the idle speed, then rev your engine and release the throttle to see if it returns to idle immediately. If it is slow to return to idle then your throttle cable could be sticking. This means when you change gear lifting off the throttle has little effect and depressing the clutch to change gear causes the engine to race as the throttle is still partially open.

Aug 23, 2014 | 2005 Ford Fiesta 1.3

1 Answer

I did clean my 250 kemco carberators .It idels wel,ref wel but does not want to go slow.Can you please advise me.


If it idles and revs fine, then make sure there is no binding in the throttle cables. Turn your handlebars, right lock to left lock while twisting the throttle open to closed. Everything should operate smoothly.

Nov 01, 2013 | 2003 Kymco Venox 250

1 Answer

Craftsman Riding Mower (24 HP 42 in cut Model 289254) with throttle issue. Very slow in 6th gear


follow the throttle cable all the way down to the engine. Have some one move the throttle up and down to see if the throttle plate is opening and closing all the way. You can loosen the screw holding the throttle cable and move it back and forth to see if it will allow the throttle plate to open and close correctly. It may have slipped when the assembler tried to tighten it.

Mar 10, 2012 | Craftsman Garden

1 Answer

My tuscon revs it's RPMs while I'm driving and the drops back down. It's happening pretty often. But check engine light doesn't come on


Clean the throttle interior and throttle plate edge. It is likely that oil deposits are lining the throttle opening and this causing the plate to stick so that when you press of the accelerator the throttle plate stays closed and then pops fully open leading to the is surge and slow effect.

Mar 22, 2011 | Hyundai Tucson Cars & Trucks

1 Answer

Engine revs wide open when starting


Check to see if the throttle shaft on the carburetor is actually moving (with engine off) Does it slow down when you move the throttle control on the dash?
Start it up and try moving the linkage on the governor shaft, if there is little or no resistance but the engine slows when you move it, most likely you have a broken governor gear inside the engine. Another possibility is that the screws that hold the throttle plate to the shaft have come loose and the plate is jammed in the throat of the carburetor

Sep 14, 2009 | Garden

2 Answers

I have a 1988 318 John Deere garden tractor and it revs really high when i turn the throttle up and revs comes back down after a few seconds. But overall,, full throttle engine is over-revving, can only...


If your rpm's are high/sluggish and slow reacting its do to your govenor inside your engine needing to be fixed.There is a plastic housing with fingers on it that will break and allowing metal balls to free float.Another problem with them is that the washer under the retaining ring will fail or loose tolerance,also located inside engine.

Jun 28, 2009 | Garden

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