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A little choke improves..

Discussion in 'Motorcycle Tech Talk' started by Peter S, May 13, 2012.

  1. Peter S

    Peter S New Member

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    A little coughing when acc. from 0 - 30 mph. Trying to adjust the mixture. Cannot figure out if it´s getting better or not. Seems to be intermittent.
    Get the bright idea to pull out the choke a little, may 1/6th of an inch.
    Result: No coughing, better torque and "cleaner" sound (still on 1-2nd gear and low speed).
    That indicates to me that the engine is too lean on low throttle.
    Am I right or wrong?
    Could the best remedy be to step up one size on the low jet?
    Peter
    Peter S, May 13, 2012
    #1
  3. charlie46

    charlie46 Well-Known Member

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    Could be a vacuum leak.
    charlie46, May 13, 2012
    #2
  4. kenfuzed

    kenfuzed Administrator Staff Member

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    +1 this is one of the tell tale signs of a vacuum leak.
    kenfuzed, May 13, 2012
    #3
  5. Peter S

    Peter S New Member

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    What the #¤@:devil:##@#!
    I spent several hours checking the rubbergasket in the manifold, silicongreased it, propaned it and checked again and thought everything was OK.
    What else can cause a leak?
    Peter S, May 13, 2012
    #4
  6. Peter S

    Peter S New Member

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    Excuse my language but I have really been thorough when reassembling so it p. me off to have to do it all over again.
    The bike season in Sweden is short so I´ll rather be out on the roads instead of crawling around in the garage.
    Ken, you mentioned that the aircleaner can pull the carb out of the rubber. I looked into it and I can only see two ways to solve that.
    1: Use double or tripple gaskets.
    2: Remove a fraktion of the plastic from the backingplate where the breather bolts are mounted.
    Any other ideas?
    The manifold itself is never removed from the cylinders so I guess the O-rings must be intact, the bike has only 4000 km on it.
    Peter S, May 13, 2012
    #5
  7. kenfuzed

    kenfuzed Administrator Staff Member

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    Usually the only reason the air cleaner assembly would pull the carburetor away from the manifold is if using an aftermarket assembly. Stock assemblies should be spaced correctly unless using one from another model. An extra gasket will apply additional pressure against the carb forcing it tighter into the manifold boot.
    kenfuzed, May 13, 2012
    #6
  8. bigg824

    bigg824 New Member

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    spray wd40 around intake gaskets and see if rpm changes if it does the gaskets are bad
    bigg824, Jun 5, 2012
    #7

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