06 Beta REV 250

Discussion in 'Trials' started by thegraydog, Oct 4, 2012.

  1. DrKayak

    DrKayak Retro Rider

    Joined:
    Mar 2, 2010
    Oddometer:
    815
    Location:
    Shingle Springs CA
    I stopped my Beta from leaking fuel by puting a fuel filter on it. It has only started that leading when on the kickstand a very few times since adding the fuel filter. When it does I turn off the gas and run it dry then turn the gas back on and no leak. I think that carb is is very sensitive to dirt getting in the float needle.

    Mine came with 27.5/145 jetting. Going to a 30 pilot made a huge difference in the way it runs. I live at 2,000ft and our club has property at 6,000ft. I think it runs great at both altitudes. Never even had the plug out of it. Best behaved 2T I have ever owned.

    Never considered dropping the main to 135. Would that be too lean at 2,000ft?
    #21
  2. lineaway

    lineaway Long timer

    Joined:
    Oct 1, 2011
    Oddometer:
    3,377
    Location:
    nm
    Yes, a 135 would be too lean at 2000ft. We are talking riding around 7000. You might get by with a 140, but it will be close depending on your bike and how you do the air filter.
    #22
  3. BikePilot

    BikePilot Long timer

    Joined:
    Jul 5, 2005
    Oddometer:
    11,251
    Location:
    Tampa
    Often at high altitude it helps to cut the head to increase compression to get cylinder pressure back up to about where it'd be at sea level.
    #23
  4. laser17

    laser17 Been here awhile

    Joined:
    Mar 6, 2008
    Oddometer:
    957
    Location:
    Boston,Massachusetts
    I know you said you machined some weight off the flywheel - but did you ever check for the optional FWW under the clutch basket? Some of the 250's had these mounted in seemingly random years. May explain the super slow revs. I think they added an additional couple of lbs!
    #24
  5. thegraydog

    thegraydog 2 wheels X 6 ways

    Joined:
    Aug 29, 2004
    Oddometer:
    694
    Location:
    the Coconino
    Laser, I'm off to see my gurus tomorrow. I will present this conundrum....
    #25
  6. lineaway

    lineaway Long timer

    Joined:
    Oct 1, 2011
    Oddometer:
    3,377
    Location:
    nm
    I can`t wait till I get to ride this Beta Dog!:D
    P.S. I have not heard of anyone taking that much weight off a modern bike, since they now use plastic in the crank itself!
    #26