Question about 2005 Honda CB 250 Nighthawk

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Motor surges at full throttle

How do you set timing

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  • paul erickson
    paul erickson May 11, 2010

    are you sure you want to mess with the timming

    i think you have a fuel problem

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  • 83 Answers

The timing is not the problem if your bike is surging at top end. The timing is fixed on these models and it's not like the old days or like a car. Your problem can be one of many.
First: does the bike idle ok after it is hot?
Second: Have you changed the air filter to an after market type? Changing the filter to an after market filter will lean the motor out which will cause a "surge" at full throttle. You will need to possible jet the motor richer to compensate for the leaner filter design.
Third: Try rolling out og the throttle from full throttle by about 1/8th and see if the engine RPM's increase and the surge goes away, if so the motor is to lean.
Let me know the answers to these questions and I can help you resolve your problem.
Third: how long has it been since you have set the valves? a tight valve can cause many many problems including this one.

Posted on Nov 30, 2008

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Posted on Jan 02, 2017

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1 Answer

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http://s.productreview.com.au/products/manuals/32141_563ae9ef16ab5.pdf

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Idle stabilisation valve or TPS (Throttle Position Sensor)
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Turn the throttle to full on - release, do this three times.
Turn the bike off.
Turn on and start.
The idle stabilisation valve can be cleaned, but a replacement is relatively cheap and easy to replace. They get gunged up and liberal so can't close fully - the ECU tries to open and close it to the required setting, hence the surging idle. Use carb cleaner around the butterfly and stepper motor areas and see if that sorts it.

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1 Answer

Throttle


and had the bike souped for it. Anyway the throttle is SUPER touchy.. You breath on it and it takes off.. Because of this I ended up dumpin it 30 min after I got on..haha... My question is is there a way to stiffen up the throttle so that i have to crank the grip harder to give it gas? I am very inexperienced, and when it took off, i tensed up, hittin the throttle even harder. I know i will appreciate the the responsiveness when I get more experience, but i dont want to die in the process..lol.. thanks for you help! ,UYou need to learn to hold on to the bike with your legs, so you aren't pulling on the bars during acceleraion. The throttles are supposed to be easy to turn, so that it will snap completely closed when you let off. You can replace the throttle cam (the part that the cable attaches to) with a slower-opening unit that will give you more control. The amount you have to turn the throttle from closed to full-open will stay thesame, but it will open slower in the first half of the throttle pull, keeping you from getting such an abrupt surge of power. Once you get a little more time on the bike, you won't have this issue any longer. You will learn proper throttle control, and your wrist will get used to the throttle pull. ,,,

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1 Answer

Throttle


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1 Answer

Throttle


and had the bike souped for it. Anyway the throttle is SUPER touchy.. You breath on it and it takes off.. Because of this I ended up dumpin it 30 min after I got on..haha... My question is is there a way to stiffen up the throttle so that i have to crank the grip harder to give it gas? I am very inexperienced, and when it took off, i tensed up, hittin the throttle even harder. I know i will appreciate the the responsiveness when I get more experience, but i dont want to die in the process..lol.. thanks for you help! ,UYou need to learn to hold on to the bike with your legs, so you aren't pulling on the bars during acceleraion. The throttles are supposed to be easy to turn, so that it will snap completely closed when you let off. You can replace the throttle cam (the part that the cable attaches to) with a slower-opening unit that will give you more control. The amount you have to turn the throttle from closed to full-open will stay thesame, but it will open slower in the first half of the throttle pull, keeping you from getting such an abrupt surge of power. Once you get a little more time on the bike, you won't have this issue any longer. You will learn proper throttle control, and your wrist will get used to the throttle pull. ,,,

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1 Answer

Throttle


and had the bike souped for it. Anyway the throttle is SUPER touchy.. You breath on it and it takes off.. Because of this I ended up dumpin it 30 min after I got on..haha... My question is is there a way to stiffen up the throttle so that i have to crank the grip harder to give it gas? I am very inexperienced, and when it took off, i tensed up, hittin the throttle even harder. I know i will appreciate the the responsiveness when I get more experience, but i dont want to die in the process..lol.. thanks for you help! ,UYou need to learn to hold on to the bike with your legs, so you aren't pulling on the bars during acceleraion. The throttles are supposed to be easy to turn, so that it will snap completely closed when you let off. You can replace the throttle cam (the part that the cable attaches to) with a slower-opening unit that will give you more control. The amount you have to turn the throttle from closed to full-open will stay thesame, but it will open slower in the first half of the throttle pull, keeping you from getting such an abrupt surge of power. Once you get a little more time on the bike, you won't have this issue any longer. You will learn proper throttle control, and your wrist will get used to the throttle pull. ,,,

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