Results 1 to 6 of 6

Thread: 86-89 fourtrax woes

  1. #1
    cox's Avatar
    cox is offline Just Too Addicted Arm chair racerJust too addicted
    Join Date
    Aug 2009
    Location
    Edmonton alberta canada
    --
    552

    86-89 fourtrax woes

    Ok guys, we CANNOT figure out what is going on with this machine. It was bought as a 89, and from the work we have been doing looks like its a 86-87. It will not idle. We have tried everything. Have two carbs now, ones totally rebuilt. The other is sparkling from being cleaned so many times. The metal is going to start falling apart from being cleaned so much. Quad starts up good, but will not idle no matter what the carb setting is at. When cold, sounds like its misfiring almost, like a pre-detonation sound. But when warmed up, sounds fine. The quad revs fine, and if you constantly molest the throttle, its rideable. Have changed the plug, and cleaned everything. has good spark. Can a valve issue cause this? i have tried to adjust valves in the past with unsatisfactory results. Not looking to do it again, unless someone can really stupid it down for me to understand. I really just dont get it, lol. Any help would be awesome.


    R.I.P. Yamahondaman
    Still practicing my NoobiX cube, take it easy on me...
    1982 Yamaha YT175J ( Not much left but the 's)
    1982 Yamaha YT175J
    1983 Yamaha YT125K + 175J =
    1984 ATC 200ES BR - running again - Camchain noise holding me back....
    1984 ATC70 -SOLD-

  2. #2
    Join Date
    Jul 2006
    Location
    United States
    --
    7,765
    adjust the valves, I bet they never have been adjusted and in that many years, they are most likely WAY out of spec

  3. #3
    Join Date
    Apr 2007
    Location
    UP of MI
    --
    804
    Yep. I would adjust the valves and see if your timing is on.
    1973 Honda CB350
    1973 Honda ATC70
    1978 Honda ATC90 (FOR SALE!)
    1982 Honda ATC110 (FOR SALE!)
    1982 Honda ATC200
    1983 Honda ATC200E
    2002 Honda Recon

  4. #4
    cox's Avatar
    cox is offline Just Too Addicted Arm chair racerJust too addicted
    Join Date
    Aug 2009
    Location
    Edmonton alberta canada
    --
    552
    and im on my way...
    R.I.P. Yamahondaman
    Still practicing my NoobiX cube, take it easy on me...
    1982 Yamaha YT175J ( Not much left but the 's)
    1982 Yamaha YT175J
    1983 Yamaha YT125K + 175J =
    1984 ATC 200ES BR - running again - Camchain noise holding me back....
    1984 ATC70 -SOLD-

  5. #5
    Join Date
    Nov 2003
    Location
    Front royal, va
    --
    2,186
    pilot jet clogged
    1985 With "86" Plastic's,Custom 12" Alluminum Extended Swing Arm,39MM PWK,"TRX" Filter,9 Paddle TALLER HALLER'S on 11" Wide Rim's,LOT'S of Stainless,LOT'S of Alluminum,LOT'S of PowderCoating,NOTHING Stock..

    FASTEST Tri-Z on The Planet...MAKE A NOTE !! and the SECOND FASTEST, WRITE IT DOWN AGAIN!!!

  6. #6
    Join Date
    Jul 2005
    Location
    leroy, new york
    --
    1,025
    ever figured it out, i always wanted one of them.

//ArrowChat Integreation Code //