Stuck throttle - gn250

[FruitLoop]

Hey guys, so on my way to work I noticed that even when I was laying off the gas my bike was still pushing forward more than usual (being a 250 and all it tends to pretty much stop when you lay off the gas). Coming off the motorway and I notice that no matter what gear, it is stuck at approx 3500-4000 revs. Managed to get it into the garage at work safely by using the clutch and neutral.

Come to my question: is this likely to be a frayed cable? Or what else?

[driftn]

Lucky its not a gixxer thou eh :yes:

I would be checking the cable first.

[FruitLoop]

Ahh yes.

Well I have ended up just taking it into Wellington Motorcycles as they were able to look at it this morning, decided after searching the web a bit it was probably not worth trying to get home in one piece in this wet and windy weather here today for my 45 min ride!

[The End]

Check the idle of the bike. It could be set too high; I sometimes find that when my bike warms up fully/after around 20 mins of riding, it idles about 500 rpm higher than usual.

[skippa1]

Check the idle of the bike. It could be set too high; I sometimes find that when my bike warms up fully/after around 20 mins of riding, it idles about 500 rpm higher than usual.

did you read his post? He said it is stuck at 3500-4000rpm. Thats not the idle being "set too high" and certainly wont "come right" when warm..

[Katman]

Push the choke in.

[FJRider]

Push the choke in.

She's taken it to "Crashers mob" to look at ... no doubt they'll find the issue.

It costs money maybe ... but better that a weeks worth of internet diognosis to sort it ...

[The End]

did you read his post? He said it is stuck at 3500-4000rpm. Thats not the idle being "set too high" and certainly wont "come right" when warm..

Her post*

A high idle has the potential to produce forward momentum - Just look at how "stunters" keep their bikes going while they are holding onto the pillion grab behind the bike...

[skippa1]

Her post*

A high idle has the potential to produce forward momentum - Just look at how "stunters" keep their bikes going while they are holding onto the pillion grab behind the bike...

mmmmm.....I understand the mechanical side of how a "stunter" keeps their bike going, its not rocket science. I dont think *she is a stunter or has purposfully set the idle to give her 4000rpm. It is also highly unlikely that the idle has just crept to 4000rpm. I guess she might have brought a bike from a crazy GN250 stunter.:blink:
It is far more likely that there has been a mechanical failure in a cable, or a cable might be lacking in lube, or a throttle return spring might have failed.
I am sure Petes crew will sort it

[Lozza2442]

Hey guys, so on my way to work I noticed that even when I was laying off the gas my bike was still pushing forward more than usual (being a 250 and all it tends to pretty much stop when you lay off the gas). Coming off the motorway and I notice that no matter what gear, it is stuck at approx 3500-4000 revs. Managed to get it into the garage at work safely by using the clutch and neutral.

Come to my question: is this likely to be a frayed cable? Or what else?

Oh shi- Must've gotten up to like 100km/hr. Hahaha.

But srsly. That's scary..

[FruitLoop]

Thanks for all the posts - and yes *she*is definitely not a stunter!

So the throttle plate and throttle hammer weren't connecting, so they took her apart, cleaned her up and she's all go again. Didn't cost a fortune either so was pretty pleased. Glad I didn't have a go at it this time...would have had the bike in pieces for ages and wouldn't have enjoyed the train (sorry train/bus) journeys (which would have cost almost as much as fixing her!) until I had her fixed up again this weekend.

Oh, and thanks the end, but the idle is generally 1500 cold and just under 2000 warm. My problem is that it slips every now and then and produces a lower idle, so have to adjust that fairly regularly. So anything over 2000 and I know something is up.

[Paul in NZ]

A GN250 idles at 2000 rpm? Egad......

[ducatilover]

A GN250 idles at 2000 rpm? Egad......

Mine's at a tad under 1500 when warm.

[FruitLoop]

Mine's at a tad under 1500 when warm.

Okay so I checked mine and when warm it is actually just on/over 1500, not so close to 2000 after all.

So after getting her back from the shop I have noticed that when in 4th/5th and going steady speeds or slowing down she has been acting as if she is running out of fuel.

First off I put it down to the strong winds as I could only just feel it, but then when the wind died down a bit the other day I was still noticing it but put it down to being almost empty on fuel. Then I got sick so haven't been out, but on the way in this morning I filled her up and it is still happening.

Would this be in any way linked to them fixing up the throttle plate/carb? A quick search on the net showed that it may do but to be honest I didn't understand half of what they were talking about.

[ducatilover]

I'd check the air filter and spark plug first, both pretty easy to do

[FruitLoop]

I'd check the air filter and spark plug first, both pretty easy to do

Thanks, I shall do this weekend. Was surprised that the bike was working fine again this morning, might have something to do with the wind? Beautiful day for a ride today!

[Paul in NZ]

Okay so I checked mine and when warm it is actually just on/over 1500, not so close to 2000 after all.

So after getting her back from the shop I have noticed that when in 4th/5th and going steady speeds or slowing down she has been acting as if she is running out of fuel.

First off I put it down to the strong winds as I could only just feel it, but then when the wind died down a bit the other day I was still noticing it but put it down to being almost empty on fuel. Then I got sick so haven't been out, but on the way in this morning I filled her up and it is still happening.

Would this be in any way linked to them fixing up the throttle plate/carb? A quick search on the net showed that it may do but to be honest I didn't understand half of what they were talking about.

Go back and ask them... They are nice chaps and they won't bite.... much...

[FruitLoop]

Go back and ask them... They are nice chaps and they won't bite.... much...

I would but I don't have any moneys right now for that, got to wait for pay day..

[Dave-]

Okay so I checked mine and when warm it is actually just on/over 1500, not so close to 2000 after all.

So after getting her back from the shop I have noticed that when in 4th/5th and going steady speeds or slowing down she has been acting as if she is running out of fuel.

First off I put it down to the strong winds as I could only just feel it, but then when the wind died down a bit the other day I was still noticing it but put it down to being almost empty on fuel. Then I got sick so haven't been out, but on the way in this morning I filled her up and it is still happening.

Would this be in any way linked to them fixing up the throttle plate/carb? A quick search on the net showed that it may do but to be honest I didn't understand half of what they were talking about.

what speed are you doing in 4th and 5th when this happens? if you speed up does it go away?

[FruitLoop]

It seems to happen at any speed. Only when accelerating fast does it go away.

I had a bad weekend so didn't get to checking it out much more, but did notice that the battery cover hasn't been holding very well and coming loose in the high winds. When I fastened it (good old sticky tape for testing!) it seemed to fix the problem which makes me worry it is something electrical which is a wee bit over my head.

There also seems to be a small tube only connected to one end...so am going to have to ring up the bike shop and ask them whether anything they did would have affected this as is quite peculiar that this has happened when I got her back as its never done this or come loose in winds before

[Dave-]

It seems to happen at any speed. Only when accelerating fast does it go away.

I had a bad weekend so didn't get to checking it out much more, but did notice that the battery cover hasn't been holding very well and coming loose in the high winds. When I fastened it (good old sticky tape for testing!) it seemed to fix the problem which makes me worry it is something electrical which is a wee bit over my head.

There also seems to be a small tube only connected to one end...so am going to have to ring up the bike shop and ask them whether anything they did would have affected this as is quite peculiar that this has happened when I got her back as its never done this or come loose in winds before

The small tube is probably an overflow for the battery (can you see liquid inside it? is it between the red lines?) or is the battery a bright yellow one?

My girlfriends GN250 had a bit of trouble when one of the screws holding the jumper to the battery came loose, I thought I'd tightened it up but the wee nut had actually rounded off and was spinning in the terminal, when I tightened it it did tighten but it was fake, just tricking, and came loose again.

give the cables sitting on the battery a wee tug, especially up and down, if they're loose then it might be as you ride along the wind buffets the terminal causing it to connect and disconnect which would result in a choking sensation (does it backfire? when it feels as though it's running out of fuel?)

this is only speculation, it could be something else, but yes a bike shop ought to see you right.

[ducatilover]

Check that there's a tube going from the righthand side of the carb and over the top of the battery box, in a place where the wind won't get it.
I've had a similar issue form wind/turbulence changing the air pressure on that line (carb bowl vent)
It wants dead still air.

[gammaguy]

A GN250 idles at 2000 rpm? Egad......

so this is what they mean by idle conversation...

[FruitLoop]

Check that there's a tube going from the righthand side of the carb and over the top of the battery box, in a place where the wind won't get it.
I've had a similar issue form wind/turbulence changing the air pressure on that line (carb bowl vent)
It wants dead still air.

I do believe that is it. So in theory if I can make sure my cover is secured properly (like I have managed with tape so far) that should do the trick? The rest seem to be fine, and taping the cover on seems to have done the trick this week.

[ducatilover]

I do believe that is it. So in theory if I can make sure my cover is secured properly (like I have managed with tape so far) that should do the trick? The rest seem to be fine, and taping the cover on seems to have done the trick this week.
Could be it, I had issues because I run mine without the covers