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81 GS850 kills once it warms up.????

  • Thread starter Thread starter nisom512
  • Start date Start date
N

nisom512

Guest
Hey all.

I was wondering why my bike is killing once it warms up. I know the reason is warming up because it runs just great idles great, it doesnt waver up and down. Air box great and sealed with Uni filter(oiled), intake boots good no leaks, carbs rebuilt the right way and with o-ring kits, intake boot o-rings, new battery, new R/R, valves adjusted, oil changed(with filter), new coils(not sure how new bought bike with them they are Accel brand), runs and drives but here is the catch. I start it, then let it sit for a bit with the choke on for about 2 min then I back out and drive off. but I can only get about 3 blocks and it will just kinda slowly kill out. it starts to get non responsive and then eventually kill.

Also ryonker and I were working on it tonight and both came to the conclution that it was killing out once warmed up. We were trying to sync the carbs just because we wanted to see if just maybe. but every time we let the bike run for more than 2 min and were trying to balance it would eventually do the same thing just kill out. so.....we would wait for about 5 min with the fan goin on it and it would start up and run for about 1 min and then kill again. and the thing runs just great so I dont know what it is.

Oh and after my 3 block drive we checked the plugs and from left to right 1=really lean(White)
2=really ritch(Black)
3=really lean(White)
4=mildly lean(grey)

I also have aftermarket 2 into 2 exhaust with baffles, its been rejetted from stock to 42.5 and 122.5.

So my question is. Is there somehting on the bike that would kill once the bikes warms up?

and why would the #2 cylander be so rich?
I tryed adjusting the mixture screw and the #2 got better but the #1 and #3 didnt really.

Any advise is really helpful

Thank you
Jake
 
Since your problem happens when the bike gets hot it would lead me to suspect one of your electrical components, rather that a fuel related problem.

What is the condition of the stator? Are the coils getting hot when this happens. Is the ignitor getting hot?

I wouldn't draw any conclusions yet on the rich/lean conditions of the engine until you can get it running on a consistent basis.
 
Hey Jake,

Rich #2 could be fuel dumping backwards down the petcock vacuum line. If you have a piece of clear tubing you might want to try that to see if there is fuel in the line.

Regarding the bike, sounds like you are running your float bowls dry. Could be bad petcock, vacuum leak from a bad gas cap or something wrong with the floats (unlikely).

You might want to try the bike and next time it craps out open the gas cap and listen for suction, which means the tank is not venting. If that seems fine, as soon as the bike craps out remove a couple of float bowl drains to see if there is fuel in there.

Hope this helps.
 
If it was fuel related, why would the bike restart and run when it cools down and cut off when it get hot?
 
almarconi said:
If it was fuel related, why would the bike restart and run when it cools down and cut off when it get hot?
Click to expand...

Petcock could be restricting flow. Running the bike drains the fuel and petcock can't keep up to fill the float bowls. Running the bike on Prime might answer some questions as well. pull off the fuel line and check to see if you get full fuel flow when in the prime position first.
 
I was working on the bike with Jake. When we were trying to sync the carbs, we were running it off a satalite gas container and it was doing the same thing...killing after it ran a little while. Then after it sat for a minute or two or three it would start up just fine. The engine sounds great and seems to run really well and then just starts to die and then kills.

Rick
 
Is there a fuel filter in the fuel line? Again, be quick next time and remove a couple of float bowl drain screws and look for gas in the carbs. If there is gas, pull a plug right away and look to see if the plug is wet or dry, also check for spark. Work fast after it craps out and check stuff. If it repeats the problem, you should be able to chase it down.
 
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Nessism said:
Petcock could be restricting flow. Running the bike drains the fuel and petcock can't keep up to fill the float bowls. Running the bike on Prime might answer some questions as well. pull off the fuel line and check to see if you get full fuel flow when in the prime position first.
Click to expand...

When we were trying to sync the carbs we were using a separate tank with clear fuel lines and rick has used it on CV carbs before I beleive. but there wasnt a hook up for the vacume line. but even so the bike did the same thing with the bikes tank on or off so I would have to reject the conclution of the petcock and tank venting. I was really thinking it was an electrical. but again I could be wrong.

Thank you guys for the quick and great responses Please keep them coming.

Jake
 
Nessism said:
Is there a fuel filter in the fuel line? Again, be quick next time and remove a couple of float bowl drain screws and look for gas in the carbs. If there is gas, pull a plug right away and look to see if the plug is wet or dry, also check for spark. Work fast after it craps out and check stuff. If it repeats the problem, you should be able to chase it down.
Click to expand...

In my Satalite gas system there is a fuel filter. Still seems to flow ok though.

Are you thinking one or more of the carbs isn't getting enough fuel and that causes it to kill?
 
Regarding venting, be sure your temporary fuel reservoir is vented. Be sure the gas cap venting is clear. Compromised venting WILL result in fuel starvation exactly as you describe.
As stated earlier, you can immediately check for fuel as it dies. Remove floatbowl drain screw(s) and see how much fuel comes out and compare.
I also wonder about the black plug/cylinder you have. If the bike is in otherwise decent tune, including proper idle rpm, the bike will not die when running on 3 cylinders due to a fouled plug. But if black, then you're getting poor combustion which must be fixed. Determine if the black plug is fuel mixture or oil fouled. Test for good bluish spark before start up and after it dies.
 
KEITH KRAUSE said:
Regarding venting, be sure your temporary fuel reservoir is vented. Be sure the gas cap venting is clear. Compromised venting WILL result in fuel starvation exactly as you describe.
As stated earlier, you can immediately check for fuel as it dies. Remove floatbowl drain screw(s) and see how much fuel comes out and compare.
I also wonder about the black plug/cylinder you have. If the bike is in otherwise decent tune, including proper idle rpm, the bike will not die when running on 3 cylinders due to a fouled plug. But if black, then you're getting poor combustion which must be fixed. Determine if the black plug is fuel mixture or oil fouled. Test for good bluish spark before start up and after it dies.
Click to expand...

It was black at first then I monkeyed with the mixture screw and the plug was less black.
 
if you tell me where the igniter is I will test this
Click to expand...

Under the right hand side cover.

Put your hand on the coils and see if they are hot after the bike is running for a while.
 
almarconi said:
Under the right hand side cover.

Put your hand on the coils and see if they are hot after the bike is running for a while.
Click to expand...

but the bike doesnt run for a while it will stay alive for about 4 min. if that today I couldnt get it to stay alive for more than 2 min so now I am really confused but if I can I will try and see if the coils get hot.

Jake
 
but the bike doesnt run for a while it will stay alive for about 4 min. if that today I couldnt get it to stay alive for more than 2 min so now I am really confused but if I can I will try and see if the coils get hot.
Click to expand...

Let think about this logically. You hook the bike to a test tank that runs straight to the carbs, leave the cap off the test tank. When you cleaned the carbs did you set the float height correctly? Assuming that you did the bowls should fill with fuel. Open up a drain screw to see if there is gas in the bowl. Let us assume that there is gas in the bowl. The engine starts and runs for a couple of minutes then shuts off. I find it hard to believe that the float bowls have run dry and remote tank can't keep up. Do your floats..float?? After it stops check the float bowl to see if there is gas. If there is gas I would tend to think that it is not fuel related. There is no gas cap to create a vacuum, no petcock to leak or malfunction. What your describing sounds to me like an electrical problem. When the motor shuts off, pull the plugs, crank the engine and see if you have spark. When the bike was running did the stator and R/R check out OK? You said the coils were new to you, did you check the primary and secondary resistance? What about your plug wires? Have they been replaced lately? Feel the coils and the ignitor for heat.
 
When I worked on the bike with Jake last night, the coils didn't seem very hot. Although it hadn't been running that long.

The portable gas tank has a hole in the top of the cap so I know gas was flowing just fine. Plus, like Jake said, we would start it up after a few minutes and initially it sounded great was responsive to blipping the throttle. Then it would die. Weird :cool:.

So issues could be

Stator? R/R? Coils? Ignitor?

Coils and plugs look pretty new (Yellow Accell ones).

Help us :confused:.

Rick
 
Coils and plugs look pretty new (Yellow Accell ones).
Click to expand...

What is the voltage at the coils? I think something is either overheating and cutting out or something is loose.

When it cut off did it just stop dead or slowly lose power like it was struggling to idle and then cut off?
 
almarconi said:
What is the voltage at the coils? I think something is either overheating and cutting out or something is loose.

When it cut off did it just stop dead or slowly lose power like it was struggling to idle and then cut off?
Click to expand...

no it pretty much had its intentions once it starts to die you try and give it more gas and it is not responsive at all. it slowly cuts but very quicky then dies.

The thought of something heating up and then the engine starting to kill is what my conclutions were.

Jake
 
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Did you guys check to see if there is fuel in the float bowls yet?
 
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