Random high revving during stop

**dontgiveajack** · 04-30-2012, 11:49 AM

While at a stop and in first gear, my 2009 Ninja 250 will shoot up to around 4000 RPM and stay there. It isn't until I let the clutch out a bit (engaging the clutch a bit), it drops down back to 2000 RPM. I've even shifted into neutral while it is revving high and it stays stuck there.

What could be the issue possibly? I've searched "sticking throttle" but that's not really what's happening.

TIA!

**jay-d** · 04-30-2012, 11:53 AM

Is it carbureted? Is this happening at operating temperature or when the bike is cold? Maybe your throttle cable needs adjusting and if it idles at 2,000rpm, that seems a little high and your idle needs adjusting as well.

This doesn't seem like a big issue, just some minor adjustments, but a little more info could pinpoint the problem.

This should also be in the Technical forum.

**absolute** · 04-30-2012, 12:21 PM

check to see if you left ur choke on, after ur bike is warmed up. the little lever on the left grip of ur handle bar

**rich6969** · 04-30-2012, 12:30 PM

try adjusting your idle screw...

**SANI-SAAB** · 04-30-2012, 01:22 PM

Originally Posted by rich6969

try adjusting your idle screw...

this

**mindactivated** · 04-30-2012, 01:35 PM

I'm surprised I haven't seen this posted more often. I see so many riders with this same problem. Particularly cruisers with straight pipes...

...okay I'm done now.

**dontgiveajack** · 04-30-2012, 01:36 PM

Thanks for all the suggestions!

I'm just wondering though... if it was the idle screw, why would the RPM's drop back to 1500-2000 after I let the clutch out a bit then back in again? If the idle screw is the culprit, shouldn't the RPM's stay at 4000 at every idle?

**ZX600** · 04-30-2012, 12:42 PM

Originally Posted by absolute

check to see if you left ur choke on, after ur bike is warmed up. the little lever on the left grip of ur handle bar

This

**dontgiveajack** · 04-30-2012, 01:20 PM

I never use choke to start up but I'll double check when I get home that it's completely closed. Is it good practice to use choke even though she starts up without it?

This high revving happens at operating temps. When coming to a stop in 1st gear and clutch in, the RPM's are already at 4000.

When this is happening, I'll close the throttle till it won't turn anymore to make sure the throttle isn't sticking but the RPM's stay at 4000 until I let out the clutch a tad to the friction zone. Only then it goes back down to 1500-2000

**mindactivated** · 04-30-2012, 01:43 PM

Originally Posted by dontgiveajack

I never use choke to start up but I'll double check when I get home that it's completely closed. Is it good practice to use choke even though she starts up without it?

This high revving happens at operating temps. When coming to a stop in 1st gear and clutch in, the RPM's are already at 4000.

When this is happening, I'll close the throttle till it won't turn anymore to make sure the throttle isn't sticking but the RPM's stay at 4000 until I let out the clutch a tad to the friction zone. Only then it goes back down to 1500-2000

Do the rpms stay at 1500-2000 after you let out the clutch for a bit and then put it back in?

If it's a carb'd bike, when's the last time they were clean?

Also, does it stay at 4,000rpm or does it go down to about 2,000rpm and then when you come to a stop w/ your clutch in it shoots back up?

What would happen if you would slow down in 1st and just slow down naturally? Would it not go below 4k?