87- Strange symptom or normal
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  1. #1
    Senior Member demarko69's Avatar
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    OK- Finished all the general maintenace. 1987, 6100 miles all stock

    Went out this morning 45degree and it fired right up after 2 kicks, big smile on my face. Idled purfectly, still a big smile. Let it warm up several minutes all is good, still smilin..



    Went for a test ride down the steet, easy and smooth. Never rev it too high just putted it around the block. 1-2-3 gears then 3-2-1, then slow cruz 2-3

    now the issue- After a mile or so it seemed to cough/ like a missfire. maybe even a small pop thru the carb. drove it home a mile with no problem. then I let it sit idling in the driveway. and it seem to cough/ like a missfire every couple minutes. It never stalled out or died.



    I dont want to run to long or hard until i determine if its normal, carb problem- timing- valves.. any input would be greatly apreciated.

    still smilin', just not a big.

    thanks

  2. #2
    Banned qwerty's Avatar
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    it could be mecanical, electrical, or fuel related. Have you tried the troubleshooting procedures in the service manual?



    Since you just did all the general maintenance, did the bike do the same thing before you messed with it? If not, it is probably something you did. Valve too tight? Carb boot not tight? Plug wire not all the way down? Plug wire pulled loose from coil?




  3. #3
    Senior Member demarko69's Avatar
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    Quote Originally Posted by qwerty View Post
    it could be mecanical, electrical, or fuel related. Have you tried the troubleshooting procedures in the service manual?



    Since you just did all the general maintenance, did the bike do the same thing before you messed with it? If not, it is probably something you did. Valve too tight? Carb boot not tight? Plug wire not all the way down? Plug wire pulled loose from coil?


    Thanks for the reply. Yes, same as before



    Allthe usual double tripled checked, new plug, airfilter, new in/out carb boots, fresh gas, plug wire seated, ect ect.

    Starts very easy, even cold. Idles great, runs smmoth under normal riding. The problem is under hard acceleration, any gear. Goes away when cruzing at a constant speed. I feels like a mis, sounds like a studder. Is this a lean/rich condition?, the pilot scwrew still has the brass plug on it. Should I drillit out, and adjust. thanks

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  5. #4
    Senior Member mrlmd's Avatar
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    Is the carb clean? You might run some Berryman's or Seafoam in the gas and see what happens. No rust or crud in the tank?

  6. #5
    Banned qwerty's Avatar
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    1987, with low miles, still has the cap over the pilot screw? Hmmm?




  7. #6
    Senior Member demarko69's Avatar
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    Quote Originally Posted by mrlmd View Post
    Is the carb clean? You might run some Berryman's or Seafoam in the gas and see what happens. No rust or crud in the tank?


    yes the tank has been cleaned, flushed. Added an inline filter to catch any thing else. Did a lazyman carb clean, but have not completely disassembled it unyil I can get all the parts/orings/gasket. Just added 2 oz seafoam, will ride it for awhile, thanks for your ideas & help.

  8. #7
    Banned qwerty's Avatar
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    Well, you're doing things in the right order. Next on the list is clean the carb. Might as well do a little rejetting while you have the carb apart.




  9. #8
    Senior Member srs713's Avatar
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    The symptoms point to fuel or air delivery problem at high flow conditions.



    Could be a partially clogged (varnish choked) jet. or a problem with the floats or float valve.



    Or spider webs in the air filter box?



    Many odd things can upset the balance of fuel and air.

    Stephen S.

    '07 TW200:

    15/50 sprockets, O-ring chain, D2Moto foot pegs

    tweaked carb (127.5 jet, 0.019 needle shim, idle screw @2.25),

    Rubbermaid "Action Packer" on homemade brackets

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