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Stalling @ 70-80mph

  • Thread starter Thread starter SOCKinside
  • Start date Start date
S

SOCKinside

Guest
GS1000E, After riding for 5 miles, at a steady 70-80 mph it starts to miss fire, starts popping and power loss, if i pull over and let it idle, bike starts to run perfect again, im not sure if its a floater prob, any ideas:confused:
 
Sounds like it may be a fuel line / fuel tap issue though 5 miles is a long way for it to run ok at that speed. Have you cleaned everything from your tank through the tap, through the carbs to your engine?
 
Does it stall at all throttle positions? Could be a bad AFR in the needle or main jetting.

Otherwise, I think the hog's fuel starvation may be the answer. Try to recreate the problem. Then pull over and loosen the gas cap and see if it happens again. With the loose cap, you can rule out vacuum lock on the fuel tank at least.
 
Fuel flow. Either the gas cap as previously suggested or fuel delivery to carbs. Is there a fuel filter fitted? That can impede flow. Carb vent tubes ok?
 
-"hampshirehog", the lines are clean, carbs i dont know? the might just be dirty, just got the bike a month ago.

-"MisterCinders" ill try that next time, but the thing is that when i actually pull over,its starts riding perfect again, maybe ill try riding with no gas cap on? until once again i keep the throttle steady at a certain RPM, and after a while it starts again, but in the city, with all the stops and goes, it NEVER happens.
 
one of my vacuum ports of my carbs is connected to the petcock actually, can that be a prob, maybe i can try disconecting it while it happens?
 
If your petcock has a lever turn it to prime and try it.. I would also clean the gas cap as suggested..
 
SOCKinside said:
one of my vacuum ports of my carbs is connected to the petcock actually, can that be a prob, maybe i can try disconecting it while it happens?
Click to expand...

That line is supposed to be there. It sends engine vacuum to the petcock which tells the petcock to flow fuel. The petcock stops fuel flow if the vacuum isn't present.
 
Pressurizing fuel bowls?

Pressurizing fuel bowls?

This only applies if you have lines attached to your fuel rail vents and I offer this as an example of the simple things...

On my 750E, I noticed stumbling when I moved my right foot forward on the pegs while running at highway speeds (normal position is on the balls of my feet)...WTF?

I discovered that the vent line on the right side was routed such that when I placed my foot in just the right spot, air was forced into the tube, effectivly pressurizeing the carb bowls. I tucked the hoses back behind the clutch cover close in to the frame and have not had the issue re-occur.
 
SOCKinside said:
one of my vacuum ports of my carbs is connected to the petcock actually, can that be a prob, maybe i can try disconecting it while it happens?
Click to expand...

Don't disconnect it at 70 MPH. You will add a load of air to that cylinder and kill your fuel supply.

Not something to do at highway speeds.
 
SOCKinside said:
one of my vacuum ports of my carbs is connected to the petcock actually, can that be a prob, maybe i can try disconecting it while it happens?
Click to expand...


That was what was happening to my bike, turns out it would loose vacuum to the petcock and fuel would be shut off. Check your carb boots, vacuum line from the #2 carb to the petcock and the petcock itself. If you have a filter might want to take it off, filters tend to restrict the gravity fed fuel flow. Just a process of elimination to discover what the problem is.
 
mrbill5491 said:
, vacuum line from the #2 carb to the petcock and the petcock itself. If you have a filter might want to take it off, filters tend to restrict the gravity fed fuel flow. Just a process of elimination to discover what the problem is.
Click to expand...

Depends on what year GS1000 he has, early ones have the vacuum port on #3 carb

SOCK, since you asking lots of questions, update your signature with you bike so we don't have to guess
 
view of the vacuum port to the tank
55B45555-DA27-43EE-879F-069A19E382C0.jpg

i guess its #2 carb? not sure
0A0B353F-6916-4B6E-AFCA-62384010E26A.jpg

BDE447F9-5315-484B-86DD-72AAE5682083.jpg
 
i rode in to work today, and it started stalling again, it was like if 2 cylinders were to stop working, i heard the carbs back firing, and poping but yet again i pull over the side of the road and all of a sudden, back to normal, i think its a carb prob!
 
SOCKinside said:
i rode in to work today, and it started stalling again, it was like if 2 cylinders were to stop working, i heard the carbs back firing, and poping but yet again i pull over the side of the road and all of a sudden, back to normal, i think its a carb prob!
Click to expand...

Not to send you chasing your tail, but something to keep in mind if it turns out not to be a fuel delivery issue.

One coil cutting out on you at speed would certainly feel as you describe above

Can you recreate the problem if you keep it running at 60mph for awhile?
 
definitely, it happens every time i stay at a steady mph, on a FREEWAY, not the city
 
Is that an inline fuel filter? Try eliminating that. If you need it, you must have rust in your tank, and probably rust in your carbs. If you don't have rust in tank or barbs, you don't need a filter. It might be the resistance that the vacuum from the carbs can't overcome at speed, and your motor is starving for fuel after a long run.
 
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