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Bike ran for 1 day

  • Thread starter Thread starter scoTTTimo
  • Start date Start date
S

scoTTTimo

Guest
I just bought a 1981 GS850 with stock air box, but straight pipes...

It sat for 3 years so I didn't even bother trying to get it to run without cleaning the carbs. I followed Mr. Nessism's tutorial word for word and dipped the carbs with new o-rings from cycleorings and new float bowl gaskets (also new intake boot o-rings). The pilot jets and main jets are stock I think pilot=40 and main=115. After I got it back together, it fired right up and after warming up I was able to ride it around the neighborhood for about 30 min. It was hesitating badly in the low-mid throttle position momentarily then lurching up to incredible power. After that I put it away and was done for the day. That was 2 days ago. Now it starts and idles for about 5-10 min., but if I give it any throttle it dies. While running cold, if I pull out the choke all the way, the rpms skyrocket, but if I turn the throttle even a smidge, it dies. If I let it idle and warm up, after about 5-10 minutes, it just dies and won't start again until cooled off. I'm not sure where to go next. Please help!
 
....."It was hesitating badly in the low-mid throttle position momentarily then lurching up to incredible power. "

It's craving more attention- it's a step by step process. Good job on carb cleaning, but those open pipes will effect jetting. Do you have a filter element in this stock airbox?
 
tom203 said:
....."It was hesitating badly in the low-mid throttle position momentarily then lurching up to incredible power. "

It's craving more attention- it's a step by step process. Good job on carb cleaning, but those open pipes will effect jetting. Do you have a filter element in this stock airbox?
Click to expand...

Sounds like it's craving fuel to me but your right, pipes are a concern
 
Measure the float height and bench, vaccum sync carbs. Adjust valves then start checking jetting..
 
tom203 said:
Do you have a filter element in this stock airbox?
Click to expand...


Yes but it's really thin, and open ended for some reason.

mpencegs said:
Measure the float height and bench, vaccum sync carbs. Adjust valves then start checking jetting..
Click to expand...

I did set the float heights, but I didn't mess with the sync screws. When I eyeballed the butterflies, they looked to be bench adjusted well already.
(Can I trust my eyes with this?)

So vacuum sync and check/adjust valve clearances? Those will be a first time for me.
 
Not adjusting my valves during initial maintenance phase is why I ended up rebuilding the top end. Its easy to do so do it :)
 
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