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81 gs850g seems to die at 65?

  • Thread starter Thread starter zedlipplin_69a
  • Start date Start date
Z

zedlipplin_69a

Guest
ok i have rebuilt the carbs synced them with a manometer bike had no problem in doing that! but when the bike gets warm it starts to high idle i just let the clutch out a little and it normals out when stopped,but it seems like everytime i head out on the highway at around 65-70 it just die and starves for fuel, i have rebuilt the pitcock ,changed the air box and boots from the carbs and still the same issue any ideas would sure appreciate it thanks!!
 
First, adjust your idle speed and mixtures with a completely warmed up engine, if it needs a little extra throttle or choke to idle cold, that's fine. If it needs a LOT of extra throttle to idle cold, there's a problem somewhere.

Clogged fuel filter, clogged petcock screen, clogged fuel tank vent, clogged screen in the needle valves, a kink in the fuel line, a crack or leak in the vacuum line, anything else that can reduce fuel flow...

Are the correct size main jets in there? Is the fuel level correct?

It could also be something clogging up the exhaust. Is the exhaust stock? If not it could be a re-jetting issue.

Good luck.
 
This points to a petcock problem, how much does it flow, with a hose going into a bucket when vacuum is applied to the vacuum hose? There should be a steady stream of fuel.

If it flows less on ON than it does on PRI, you need a new petcock, or at least take it apart to find out why.
 
tkent02 said:
First, adjust your idle speed and mixtures with a completely warmed up engine, if it needs a little extra throttle or choke to idle cold, that's fine. If it needs a LOT of extra throttle to idle cold, there's a problem somewhere.

Clogged fuel filter, clogged petcock screen, clogged fuel tank vent, clogged screen in the needle valves, a kink in the fuel line, a crack or leak in the vacuum line, anything else that can reduce fuel flow...

Are the correct size main jets in there? Is the fuel level correct?

It could also be something clogging up the exhaust. Is the exhaust stock? If not it could be a re-jetting issue.

Good luck.
Click to expand...
okay the jets are stock so is the exaust,there is no sock on the pitcock or no fuel filter either just straight flow!what i have been concerned about is the routing of the gas lines seems suzuki wasnt thinking very clear on that the line off the pitcock bends where the line requires a sping to keep it from cremping in and the new line is bigger than the stock lines on outside diameter because suzuki dosen't make it anymore in a smaller size so maybe theres a vacum leak also thanks for the advice
 
Try an independent Volvo or BMW dealer for good quality fuel and vacuum lines in the correct metric sizes for the old Suzukis.
 
Greetings and Salutations!!

Greetings and Salutations!!

Hi Mr. zedlipplin_69a,

I have collected most of the information you need to get your bike running well. It's a full list of items that must be checked, cleaned, replaced, repaired, adjusted, etc. It's a little something I like to call the "mega-welcome". :rolleyes:

Anyway, let me dump a TON if information on you and share some GS850G lovin'. :D

I just stopped by to welcome you to the forum in my own, special way.
big_hi.gif


If there's anything you'd like to know about the Suzuki GS model bikes, and most others actually, you've come to the right place. There's a lot of knowledge and experience here in the community. Come on in and let me say "HOoooowwwDY!"....
hat1.gif


Here is your very own magical, mystical, mythical, mind-expanding "mega-welcome". Please take notice of the "Top 10 Common Issues", "Top 15 Tips For GS Happiness", the Carb Cleanup Series, and the Stator Papers. All of these tasks must be addressed in order to have a safe, reliable machine. Now let me roll out the welcome mat for you...

carpet.jpg


Please click here for your mega-welcome, chock full of tips, suggestions, links to vendors, and other information. Then feel free to visit my little BikeCliff website where I've been collecting the wisdom of this generous community. Don't forget, we like pictures! Not you, your bike! :D

Thanks for joining us. Keep us informed.

Thank you for your indulgence,

BassCliff
 
Interesting problem, at first I was thinking float level to low until he mentioned being able to run the bike on prime.
 
TPL said:
Interesting problem, at first I was thinking float level to low until he mentioned being able to run the bike on prime.
Click to expand...

Typical GS problem with the vacuum petcock.
At least they don't leave you stranded. Just remember to turn to run when you get off. ;)

Daniel
 
thanks again guys for all this information and as everyone said it is a pitcock issue! had it checked out and there is a spot inside that when it is in the on position it pinches the o ring and blocks the flow in one of the flow holes, and i am guessing it dosent let the tank vent well at high rpm?just one little missing piece of thread inisde (pot metal) so out with the old and ordering a new one!! thanks again guys..
 
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