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Posted on Apr 15, 2017
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I have an 81 gs750 and I have pod filters shortened exhaust,

I have outer and 145 inner mains, pilots are 50, slides have two extra spacers in the needles and the air mixture screws are out 1.2 to 3 turns.. I have no porblems idling and revvingin neutral.. but under load ( actually riding it) it bogs at about 1/2 turn and sputters until I let off the throttle a little bit then it revss up and goes.. I've been messing with these carbs for three weeks now and this is the bes they 've acted however I want it more crisp when riding.. not knowing what else to do.. oh.. the exhaust isn't straight through.. just the emd baffles have been cut off.

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  • eyetod
    eyetod Apr 09, 2012

    oops the outer two mains are 140..

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1 Answer

dhnguyen

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  • Expert 281 Answers
  • Posted on Apr 16, 2017
dhnguyen
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Well you made 2 mistakes here.

1. pod filters
2. shortened exhausts.

These engines are designed and tuned specifically to run the best with the stock air filters as well as the stock mufflers and exhaust. Putting pods on and chopping off your exhaust pipes may look cool but it will cause the bike to run very poorly My advice would be to put it all back to stock and see how she rides and then change things one at a time.

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Anonymous

  • 27 Answers
  • Posted on Jun 02, 2011

SOURCE: 99 kawasaki kx 125 2-stroke wont start or stay

I would check the compression of the piston, the rings could be stuck and not have good compression. It should show 120 psi or more. Also can pull off the exhaust and look in the exhaust port to see the rings, piston, and cylinder walls. If the motor has a power valve make sure that is not gummed up or stuck. Mark C

Testimonial: "It was good advise, I still have not fixed the problem, but we are working on a solution as we speak. trying to narrow it down and we are close"

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Anonymous

  • 1623 Answers
  • Posted on Aug 03, 2011

SOURCE: i have a 1999 yz250

Hello Rick...Try backing the idle air screw out another half to 3/4 turn. The mid range stutter on these bikes is usually from the interface between the needle and the brass bushing just above the main jet. Also check your reeds, a chipped reed will cause the same problem. Clean all the carbon and gunk out of the expansion chamber. If it's real bad you may have to use a torch. Make sure your air filter is clean.
A 165 main jet will give you better response with a 40:1 mix, specially if the plugs are fouling.
..You can also go up a heat range on your plug... I hope this helps.

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