Low speed turnin stumble...
Thread Starter
geezer
SuperSport
SuperSport
Joined: Jan 2008
Posts: 556
From: Honolulu
Low speed turnin stumble...
Just recently the engine on my Hawk has been exhibiting a minor stumble when leaning to make a sharp low speed turn, such as into a driveway or when making a tight 180. It's only a momentary hiccup that happens at low RPMs and goes away with throttle application...this occurs when turning in either direction.
Anyone experience this and/or know what the fix is?...don't want the engine dying on me in this situation...
Anyone experience this and/or know what the fix is?...don't want the engine dying on me in this situation...
Last edited by oahu hawk; Feb 24, 2009 at 11:32 PM.
Senior Member
SuperSport
Joined: May 2008
Posts: 530
From: Central Fl.
Mine did it too, back in the dark ages, symptom went away after extensive modifications including high compression pistons and sport cams.
You might want to check your idle adjustment or carb balance. Huge throats on those things, when the engine speed drops and the velocity of the air goes down, the venturi effect weakens. Idle too low and/or balance being just a little out will cause what you describe.
Good luck out there.
You might want to check your idle adjustment or carb balance. Huge throats on those things, when the engine speed drops and the velocity of the air goes down, the venturi effect weakens. Idle too low and/or balance being just a little out will cause what you describe.
Good luck out there.
Senior Member
Superstock
Joined: Nov 2008
Posts: 286
From: texas
mycarbs where stumbling at low rpms when i first got the bike but after a jet kit was installed the mechanic said the carbs were dirty and that was most likley the cause? after the jet kit a cleaning and a synch no more stumbling.
Senior Member
MotoGP
Joined: Aug 2006
Posts: 2,934
From: altoona, pa
I want to jump in here since you mentioned tank filter. Is there a certain procedure for removing the petcock/filter? I have sputtering, backfiring, stalling since I took the air cleaner off to find a couple bolts i dropped. I tried to remove the petcock and couldn't get the filter out. Didn't want to force it/
What's the trick?
thanks, Nathan
What's the trick?
thanks, Nathan
Moderator
MotoGP
Joined: May 2005
Posts: 2,708
Just recently the engine on my Hawk has been exhibiting a minor stumble when leaning to make a sharp low speed turn, such as into a driveway or when making a tight 180. It's only a momentary hiccup that happens at low RPMs and goes away with throttle application...this occurs when turning in either direction.
Anyone experience this and/or know what the fix is?...don't want the engine dying on me in this situation...
Anyone experience this and/or know what the fix is?...don't want the engine dying on me in this situation...
The fuel level in the float bowl may be creeping up when the bike is at an angle. Check the float needles for wear.
Any other symptoms?
Thread Starter
geezer
SuperSport
SuperSport
Joined: Jan 2008
Posts: 556
From: Honolulu
Senior Member
Back Marker
Joined: Jun 2006
Posts: 194
I want to jump in here since you mentioned tank filter. Is there a certain procedure for removing the petcock/filter? I have sputtering, backfiring, stalling since I took the air cleaner off to find a couple bolts i dropped. I tried to remove the petcock and couldn't get the filter out. Didn't want to force it/
What's the trick?
thanks, Nathan
What's the trick?
thanks, Nathan
Senior Member
MotoGP
Joined: Aug 2006
Posts: 2,934
From: altoona, pa
I too had the same problem. I didn't want to risk tearing the mesh, so I pulled it out as much as possible and cleaned the bottom of the filter as best I could. I'm told I just need to man up and remove it. Anyway, it seemed to get rid of a stalling problem I was having, turning right, up a steep driveway.
thanks, nathan
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