Author Topic: Two stroke Tech question  (Read 2299 times)

Bob Purton

  • Prolific Poster
  • *****
  • Posts: 5041
    • Inter microcar
Two stroke Tech question
« on: October 10, 2010, 06:20:02 PM »
As smallish two stroke motor with disc valve. The motor will only run with full revs range when on choke. Runs in the higher rev band without choke but not lower or idle. Whats your diagnosis? My guess is idle jet passage in carb blocked or hardened crankseals. Any other ideas?

Big Al

  • Prolific Poster
  • *****
  • Posts: 4578
  • Ranttweiler, biting the breeze block of banter
Re: Two stroke Tech question
« Reply #1 on: October 11, 2010, 08:25:17 AM »
Sounds like blocked jet. Hard seals is an air leak or oil leak. If air leak then the mix is weakened. If oil leak you can normally smell it in the exhaust as engine oil smells differently to 2 stroke when not burned completely. Crudded ports/exhaust might be considered. Not up on disc valves.
Messerschmitt set, Goggo Darts, Heinkel 175, Fiat Jolly, Autobianchi, Fairthorpe Electron Minor, Borgward, Isuzu Trooper
Citroen BX 17TZD & GTI 16v
Held - MG Magnette ZB & 4/44
For sale - Vellam Isetta, Bamby, AC Type 70, Velorex, Church Pod, Reliant Mk5, KR200,  Saab 96, Bellemy Trials, Citroen BXs