Author Topic: k100 barely starts, won't hold idle, revs cleanly to 5-6k  (Read 3414 times)

Offline CCalms

  • Motobrick Curious
  • Posts: 13
k100 barely starts, won't hold idle, revs cleanly to 5-6k
« on: June 10, 2016, 03:52:01 PM »
I can only get it to rev out if the starter button is held down, otherwise it just idles as though it's on two cylinders and dies after a few seconds. It's my understanding that the fuel mixture is enriched while the starter button is held down. It seems to sound very nice in the 3k-5k rev range but it doesn't seem to be able to rev all the way to redline.

The bike had 29k miles and sat for 12 years before I bought it. I changed the fuel pump and injectors and rode it for about a year.
Thanks
  • Seattle
  • 1985 K100

Offline Brad-Man

  • ^ Proficient Motobricker
  • Posts: 360
Re: k100 barely starts, won't hold idle, revs cleanly to 5-6k
« Reply #1 on: June 10, 2016, 05:50:48 PM »
The fact that pushing the starter button helps indicates that you are lean.

You also need to know that you have an Air Flow Meter and not a MAS.

Either you have an Air leak - which should pretty much have no effect at high rpm's, or you have a bit of a fuel delivery problem related 1 0r more cylinders.
  • Marietta, GA
  • '85 K100
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Offline Laitch

  • Faster than a speeding pullet
  • Administrator
  • ^ Quintessential Motobricker
  • Posts: 11299
Re: k100 barely starts, won't hold idle, revs cleanly to 5-6k
« Reply #2 on: June 10, 2016, 06:10:19 PM »
What are the compression readings?
  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline jjs1234

  • ^ Proficient Motobricker
  • Posts: 409
Re: k100 barely starts, won't hold idle, revs cleanly to 5-6k
« Reply #3 on: June 12, 2016, 03:14:35 AM »
Coil packs?

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  • Northern California
  • 1984 K100
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