Author Topic: K75........misfiring and no idle  (Read 3897 times)

Offline keith g

  • Motobrick Curious
  • Posts: 27
K75........misfiring and no idle
« on: January 27, 2015, 12:02:16 PM »
it started to misfire just before christmas put new plugs and wires on her but the problem is still there........i'm open to suggestions as to what may be the cause.....!!
  • UK
  • 1985 K75c

Offline TimTyler

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  • ^ Quintessential Motobricker
  • Posts: 1884
Re: K75........misfiring and no idle
« Reply #1 on: January 27, 2015, 12:09:30 PM »
My money is on "air leak".

Offline keith g

  • Motobrick Curious
  • Posts: 27
Re: K75........misfiring and no idle
« Reply #2 on: January 28, 2015, 05:23:25 AM »
i was hoping it would be simpler than that....:)
but it is an '87 model and all original.......the inlet rubbers are def past there best......oh well......in the garage...pull her to bits...:(
  • UK
  • 1985 K75c

Offline Inge K.

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  • Posts: 1451
Re: K75........misfiring and no idle
« Reply #3 on: January 28, 2015, 05:37:40 AM »
Start With checking the crank ventilation hose......S shaped, at the rear end of the plenum chamber.
They have a rather short average lifetime.............
  • Norway

Offline TimTyler

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  • Posts: 1884
Re: K75........misfiring and no idle
« Reply #4 on: January 28, 2015, 11:41:21 AM »
What Inge said.

Air leaks aren't necessarily expensive or hard to fix, and they can be easy to find with a spritz of carb cleaner.

You could also try replacing your fuel filter which might be clogged and you could check to see if there's a bunch of mice living in the airbox.

Offline keith g

  • Motobrick Curious
  • Posts: 27
Re: K75........misfiring and no idle
« Reply #5 on: March 15, 2015, 05:10:29 PM »
Tim.......you were right.......airleak.......when i took the throttle bodies off,the centre inlet stub came with it...!!!,all new rubbers fitted,runs better than ever...!
  • UK
  • 1985 K75c

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