Cutting out at high speeds

Discussion in '2-Stroke Engines' started by davidsis, Dec 12, 2006.

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  1. davidsis

    davidsis Guest

    My bike wants to cut out at high speeds. I have always heared that if engines do this it is fuel related, and that usually when it does it at low speeds it is ignition related. Only thing different done to the bike was a 7mm automotive style spark plub wire and boot. Probably easier if I first put the original one back on first hu?

  2. Tom

    Tom Active Member

    Aug 4, 2006
    Likes Received:
    Yeah, try that first. Is the "cut out" sudden?
  3. davidsis

    davidsis Guest

    Cut out

    Ya, at very top rpm, but I think it is the fuel too rich though.
  4. gone_fishin

    gone_fishin Guest

    did it start cutting-out as soon as you changed the plug wire?

    otherwise, look to the fuel: mixture, filter, cookie had a clogged jet i recall...

    i've gotten pretty good at making adjustments "on the fly" by feel, the mixture screw moves fairly quickly on longer runs.
  5. davidsis

    davidsis Guest

    That's it

    It was the mixture screw. It was rich thanks brow. Hey what does that mean if you have to load or unload go to the white side?
  6. gone_fishin

    gone_fishin Guest

    frank zappa
    joe's garage - the story of frank's experiences with warner brothers
    "the central scrutinizer" is always saying that throughout the story
  7. davidsis

    davidsis Guest


    Have to read that
  8. gone_fishin

    gone_fishin Guest

    not read...listen..."joe's garage" is a 2-LP set from 1980 8)
  9. hoggedbike

    hoggedbike New Member

    Jan 8, 2008
    Likes Received:
    Hello folks, I am having this same problem with my 65cc and I am curious if you guys mean the idle speed screw when you say "mixture screw."


  10. fetor56

    fetor56 Guest

    I don't think they mean the idle screw...i think they mean the mixture needle actually inside the carby.It has 4 settings and generally it's on the default factory 2 setting.I needed to place mine on the 4th setting to make it run richer.
    While your there o-ring your carby if u havn't already done so.
    There's heaps of posts about carby' to start searching man. :smile: