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GS750 poor acceleration

  • Thread starter Thread starter casimage
  • Start date Start date
Success?

Success?

Keith:

Wow, you really know your way around Suzuki GS's.

I moved the clips to number 4 position, installed the 120 jets, bench sync'd and put the carbs back on the bike. Followed your instructions to the letter incuding putting a dab of grease on the plate at the throttle arm base. Pilot jet and air jet screws are 1.5 turns out.

It started right up, I let it warm up and then played with the throttle. It is smooth all the way up to 9K rpm. No more hestiation or lagging. Starts popping around 8K but I can live with that until I get time to sync the carbs using the motionpro carb stick.

There is some popping on deceleration when I let go of the throttle

I will fine tune it when I get back from San Francisco next weekend but all the major problems seem to have been corrected.

Thanks again for all the help and advice. I could not have done this without your and other board members' assistance.
 
I'm glad it's running better.
The carbs must be vacuum synched before you can get accurate plug reads and true performance results. I'll wait 'til that's done and read your test results. If it still pops at 8K which I assume was at 3/4 plus throttle (?) we'll have to get plug reads at full throttle. We'll need plug reads at full, 1/3, and minimum throttle positions regardless if it pops or not. The important thing here is throttle position, NOT rpm. We'll make changes according to the plug/performance results. You still have one needle position richer to use if your 1/3 tests are lean and we'll see what the mains say later.

Decel' pop is something that we sometimes have to live with when making intake/exhaust changes, but too much decel' pop isn't acceptable. Be sure your header gaskets aren't leaking though before richening the pilot circuit. You can first try adjusting the pilot fuel screws an ADDITIONAL 1/2 turn out and test. If no joy, you can try a 1/2 turn more. Be aware these richer screw adjustments may help with decel' pop but may create another problem. If no joy still, I suggest returning the screws to about 1 1/4 and installing 17.5 pilot jets. Be sure you get the exact same length/style of pilot jets if needed. But the pilot circuit is sensitive to good/uniform vacuum too, so fine tuning the pilot circuit will wait 'til the vacuum synch is done too.
 
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