Problem with low idle speed

Discussion in 'Carb/Tuning' started by kungi, Dec 21, 2017.

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  1. Dec 21, 2017 #1

    kungi

    kungi

    kungi

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    Can someone give me any hints, from where should I start, if motor running at speed ~1000-1500 rpm and making those strange puffing hedgehog noises (from 0:15)? Those hickups are coming from somewhere above the motor, below airfilter box.. Is there problem with carburetor seals between carb and motor? She is also reacting really slowly, when hitting the gas.
     

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  2. Dec 21, 2017 #2

    AJBinVA

    AJBinVA

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    Start with cleaning the carb. Bad diaphragms clogged idle circuit could all cause the coughing/blowback.
     
  3. Dec 21, 2017 #3

    93max

    93max

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    What AJ said! Carb sync to follow.
     
  4. Dec 21, 2017 #4

    MaxMidnight

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    I would be inclined to synch. carbs first.
     
  5. Dec 21, 2017 #5

    kungi

    kungi

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    Most likely the second guess, because I just made second carb sync/cleaning during 1 year. After that I have driven just around 400-500 km. And it's 3 years, since I replaced diaphragms. Those rubber parts, to be exact..
     
    Last edited: Dec 21, 2017
  6. Dec 22, 2017 #6

    dannymax

    dannymax

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    Diaphragms should last longer than 3 years, I'm leaning toward cleaning being the culprit.
     
  7. Dec 22, 2017 #7

    Bill Seward

    Bill Seward

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    I'm thinking my 25 year old diaphragms probably look like Swiss Cheese by now..
     
  8. Dec 22, 2017 #8

    liptoss

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    Sounds to me like low speed/idle circuit plugged. Snorting back through carbs.
    Shotgun or pull carbs and clean.
    Welcome to the WONDERFUL WORLD OF VMAX!
     
  9. Jan 8, 2018 #9

    kungi

    kungi

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    OK, it is now pretty cold time here in EST anyway, so I will try all suggestions one by one. No hurry getting back on the streets.
     

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