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Author Topic: 2 stroke Kawasaki ks125 HELP!  (Read 213 times)

Offline drewfinn

  • Posts: 60
2 stroke Kawasaki ks125 HELP!
« on: Aug 10, 2017, 00:44:42 »
 I'm at wits end ( and wallets end). I've been working on a 74 ks125 since June. Bored cylinder,new piston+rings,new con rod,balanced cam shaft, bottom and top both rebuilt. Starts and idles great,but, under load,at upper rpms (5-6k) she sputters and misses, power loss. The only thing I can think of is that at some time in it's life the timing got advanced to far...any ideas,folks?
Ride the heck out of it!

Offline firebane

  • Posts: 425
  • braaaaaaaaaaap
Re: 2 stroke Kawasaki ks125 HELP!
« Reply #1 on: Aug 10, 2017, 00:47:19 »
You done a leak down test?

Offline advCo

  • DTT BOTM WINNER
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  • Posts: 2189
  • Nick Ol' Eye
    • adventur Studios
Re: 2 stroke Kawasaki ks125 HELP!
« Reply #2 on: Aug 10, 2017, 01:00:18 »
Have you set the timing with a dial gauge in spark plug hole, finding TDC and then using service manual specs for timing BTDC? Timing is everything on these old 2 strokes.

Also have you considered your carburetor jetting? Sounds like it could be main jet territory.

I'm sure one of the carb gurus here can offer 2 cents.
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
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Offline drewfinn

  • Posts: 60
Re: 2 stroke Kawasaki ks125 HELP!
« Reply #3 on: Aug 10, 2017, 01:00:52 »
Leak down test all good,held pressure like a champ.
Ride the heck out of it!

Offline drewfinn

  • Posts: 60
Re: 2 stroke Kawasaki ks125 HELP!
« Reply #4 on: Aug 10, 2017, 01:04:21 »
 I was leaning towards timing- the set screw has been loosened and tightened so many times that it was stripped- just haven't gotten to that piece. I pulled the main jet to check it this afternoon,but it hasn't any numbers marked on it so I'm flying blind with that end of things.
Ride the heck out of it!