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Thread: 89 trx250r jeting / porting question

  1. 01-13-2010, 04:52 PM #1
    PAPA250r
    PAPA250r is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    89 trx250r jeting / porting question

    i have a 89 250r stock bore lrd adjustable pipe . motor was ported by prior owner and i dont have too much info on the port work. i have lots of compression about 180#s

    i have been trying to jet this thing in right for a long time and cant seem to get it right. i put a fresh set of reeds in it . i run 32:1 amsoil in the gas.

    it fouls plugs and just dosent rev like it should it sounds rough on the low end and smokes . once i get past this "flat" spot it screams . it is also hard to start when cold ?

    i have tryed playing with the clip to lean it out and went down a few sizes gradually nothing seems to help ?

    can it be a crappy port job ? bad carb ? im stumped . im ready to throw the carb and jug in the garbich and start fresh..lol

    i have ridden other quads that are jetted in and im so jealous..lol

    any ideas ?
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  2. 02-09-2010, 05:43 PM #2
    KASEY's Avatar
    KASEY
    KASEY is offline weee weeee weeeeeeeeeee ! ! ! The day begins with 3WW
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    porting has NOTHING to do with starting................................... what pilot jet are you running? what needle? what slide # ..? if it fouls plugs are they black? if so your rich,, will it start cold without the choke?
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  3. 02-10-2010, 09:10 PM #3
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    Jason Hall
    Jason Hall is offline Power User Roostin Away
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    First thing to check, make sure the carb slide Is In with the cut out toward the rear of the carb (PJ Carb Stock In 89). Then start playing with the choke knob/Idle adjuster with the air screw set 1-1/2 turns out. If the slide Is In wrong, It will load up like crazy at Idle and through the mid rpm range. Find out what size pilot jet Is In It.

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  4. 02-10-2010, 09:19 PM #4
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    Is the Carb stock ?
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