Discussion in 'Introduce Yourself' started by mean lean, Feb 2, 2008.

  1. mean lean

    mean lean Member

    Hi my last name is Lean, the mean is a **** take. Ived raced road and xc mountain bikes, bout 8 yrs total. Work in a bicycle shop, mechanic and sales. worked bout 3 years as bike courier. Live in Adelaide, South Australia. We've got great hills to cycle through. I own 2 mountain bikes kited with 48cc, I think?, engines. I could never hope to get my girlfriend fit enough to come up in the hills for a cycle, camping expedition. But these things could be the answer!
    having a great time,
    mean lean.

  2. azbill

    azbill Active Member

    welcome to MBc ! :D
  3. BoltsMissing

    BoltsMissing Active Member

    Yipes !,
    Another one from Adelaide, we got the best hills east of the city BTW.
  4. Abeagle

    Abeagle Guest

    Welcome to MBc. :cool:
  5. Scottm

    Scottm Guest

    welcome to MBc. Wow another Adelaide rider. Hope you guys get a rally or good ride put together.
  6. mickey

    mickey Guest

    Welcome aboard
  7. mean lean

    mean lean Member

    cheers for the quick replys. I got turned on to these mutant bicycle things through an old school buddy, and ive infected 2 of my cycling buddys already, few others real keen. my first motored went together so well!, the second has had some carby problems, only runs on half choke? also leaked a lot, petrol tank tap doesnt switch off properly. I have limited understanding of motors, but keen as to know more. I took carby apart, as far as i can work out, the more the choke is on the more air is being brought in? I adjusted the setting of the jet, to the top notch, less fuel? hasnt changed anything, figured id approach the wize before I do anything else.
  8. mickey

    mickey Guest

    If you're having to choke the engine to get it to run, you might have an air leak forward of the carb. More choke means less air and a richer mix. Use the search function to find out about ways to fix that. Carb + o-ring. If full chock won't shut the motor down, you definitely have a leak and are risking you're motor by running too lean, mean.

    Edit: True story. My son called me after he started riding my bike at college and complained that he was having to ride with the choke partially on as the motor just wouldn't run with the choke all the way off. Hmm, says I, so when you push the lever all the way down, the engine quits? Down?!?, says he, er, I thought that up took the choke off. Har, har, says I, no my son, it pivots and the intake is at the bottom of the carb. So, without meaning to insult your carb mojo, you are sure that you are taking the choke off when you mean to?
    Last edited by a moderator: Feb 2, 2008
  9. mean lean

    mean lean Member

    cheers mickey, full choke, lever all the way up shuts her down. does that rule out air leak?
  10. Dockspa1

    Dockspa1 Guest

    no, but it rules out a large air leak.
  11. mickey

    mickey Guest

    Helps. Is the problem at idle or do you need choke even at wide open throttle when the motor is warm? Choke full on kills it even if you are giving it gas? or kills it at idle? Does it stumble and then catch up after a second or just die off? Has it always been this way? Run the same mix as your other bike? If you still have your first bike, and you switch carbs, does the problem follow the carb?

    Edit: Have you looked at you sparkplug? Is it black and wet/oily? Gapped correctly?

    You could try riching up the mixture by moving the c-clip further down on the needle. Most of them seem to come from the factory on the 2nd slot, some people run better on the 3rd slot. I don't know anyone who runs better on the bottom slot but you could try it.

    I think that there have been a couple of threads with similar problems. I'll try a search.
    Last edited by a moderator: Feb 2, 2008
  12. mickey

    mickey Guest

    A question for the real carb gurus: If lean's float level were too low, would having the choke on improve the flow through the jet, vacuum it up, so to speak, or is fuel flow through the jet a function of the velocity/volume of the airflow? (the venturi effect?)
  13. mean lean

    mean lean Member

    these bikes are super fun and this forum super helpful!
    Last edited: Feb 2, 2008
  14. mickey

    mickey Guest

    Any progress?
  15. fetor56

    fetor56 Guest

  16. mean lean

    mean lean Member

    Cheers mickey, Problem solved, plummers tape at intake pipe near carby also on thread where throttle attatches to carby. few dodgy finishes on these chinese motors, pay for what you get! problem solving part of the fun, thanks again.
  17. mickey

    mickey Guest

    Excellent. Rock On!