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82 gs750 won't idle when hot.

  • Thread starter Thread starter quigman
  • Start date Start date
Q

quigman

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I bought my gs750 two months ago, it didn't run when I got it. I put a new battery in it and it fired right up. After idling smoothly for about 5 minutes the bikes idle started getting lower and eventually died. It wouldn't fire back up. I go out a half hour later and it started right up and did the same thing again.

I checked the plugs and they were black I replaced them. I checked the petcock no fuel came out the vacuum line and fuel only flows from the fuel line. I changed the rectifier. The carbs are clean from what I can tell. And the choke isworking fine.

If anyone has any ideas please let me no. I'm stuck!
 
Thanks guys all give them a good cleaning here in the next few days.
 
Thanks guys all give them a good cleaning here in the next few days.
 
And when you've done them (using liberal amounts of solvent and an airline), even if you think you've done it right, be prepared to do them again. Many folks have cleaned out their carbs only to have to do them again. There's a lot of luck involved in getting it right first time.
 
Hmmm, five minutes is about how long it will idle if it's not getting enough fuel to refill the float bowls. Are you sure the petcock is flowing fuel correctly when the vacuum is opening it?? Just curious how you tested it? Could be barely opening, so as it idles the fuel level gets lower and lower until it quits, then the petcock leaks enough to refill it over the half hour it sits.

I have seen this before with exactly the symptoms you are describing.
 
what the other said, clean your carbs, also, have a look at your coils when it dies, see if the still spark when it dies.. maybe they fail when they get hot..
 
Iwas told to test the fuel cock by sucking the vacuum line and if fuel flows through the fuel line and not into the vacuum line it was good. I am taking the tank off this coming weekend to check for rust in the tank so I'll take the fuel cock apart then.
 
I checked the coils after they were hot and they were still sparking . I have no way to measure the voltage to compared before and after.
 
Hey guys! New here, I am having this same problem and was curious to the outcome of the problem. I have my carbs apart and am waiting for new orings and jet plugs. I plan on taking them to a friends and dipping them in acid, can I put the jets in acid as well?
 
Acid?!?! What kind of acid are you talking about? I have always had good luck with Berryman' s carb dip.
 
Thanks for the info, just got done dipping the last carb in berrymans. Decent stuff,just waiting for orings to put carbs back together,and tring to get rust out of the tank.
 
Agree on the valves. In fact, do all the maintenance. Check the Newbie Mistakes thread linked in my signature for a list of items to be aware of.
 
Carbs are back together, runs great until it warms up then still stalling, valve clearances range from .001-.003 inches, I am going to adjust all valves to .003 inches and see what happens. Thank you Nessism I will check that out.
 
Can i ask is this stalling (only when hot) ONLY when it is idling ? and has been for 5 minutes ?
(Ill be honest i dont think my bike would want to idle for 5 mins)

Just that you dont say - so does it stall after the 5 minutes if you are riding it ?
what if you gave it a good reving when idling would that extend the 5 mins until stalling ?

Is the pilot air screw set correctly ? on carbs. Think factory setting is 2 turns out ? ish.

My old bike was transformed with new carb to head rubber circular o ring seals and ticks over perfectly now.
(All other tuning obviously done too)
 
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Ok getting ready to give up! This bike was sitting for 12 years and was givin to me. I have taken care of a charging issue, set all valves to .0025-.003, soaked carbs and jets in carb dip all jets are factory spec jets. Replaced carb boots, orings and clamps also replaced carb. orings. When the bike stalls it will not restart until it cools back down. I have not had it on the road but if I keep reving it it will stay running, battery voltage is 12.6-13 volts strong.
 
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