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Thread: 83 250r running weird any thoughts?

  1. 10-25-2016, 02:02 PM #1
    seth6025
    seth6025 is offline First Time Rider Arm chair racerNew to the board
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    83 250r running weird any thoughts?

    Hi I just got the bike and I was wondering if you think I might have a carb issue or something else? I start the bike and let it warm up....It starts easy and idles fine. But when I take off there seems to be an issue. First though 3rd it wont rev out...it just kinda spits and sputters at the high rpm (or lack of) Then I hit 4th and it opens right up and so does 5th. I then gear down all the way and start over. All gears seem to open right up now.....If I shut it off this process starts all over again. Any ideas?
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  2. 10-25-2016, 03:17 PM #2
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    yaegerb
    yaegerb is offline yaegerb The day begins with 3WW
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    Need some information first.
    1. What model of carb is it? OEM or Aftermarket?
    2. How many turns out is the airscrew?
    3. What size is your pilot?
    4. What clip is your needle on?
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  3. 10-25-2016, 03:22 PM #3
    seth6025
    seth6025 is offline First Time Rider Arm chair racerNew to the board
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    I just got it and I am actually taking the carb of tonight so I will post the results that I find. It is a mikuni carb and there is a number on the side that says 30 I believe. Don't think that is the correct carb for the year is it?
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  4. 10-25-2016, 03:32 PM #4
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    yaegerb
    yaegerb is offline yaegerb The day begins with 3WW
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    Stock was Keihin, not Mikuni. However, if you find that it is a Keihin, then the stock carb specs for that model/year is the following:

    Model: PE30A (30MM)
    Float Level: 20MM
    Air Screw Turns Out: 1-1/2
    Needle Clip: 3rd from top
    Pilot: 50
    Main: 130
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  5. 10-25-2016, 03:35 PM #5
    seth6025
    seth6025 is offline First Time Rider Arm chair racerNew to the board
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    Awesome thanks I will compare that tonight....Also am I correct that a nice upgrade for my bike would be a Keihin 34mm PJ carburetor?
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  6. 10-25-2016, 06:07 PM #6
    seth6025
    seth6025 is offline First Time Rider Arm chair racerNew to the board
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    Ok so this is what it was...and yes it was a keihin carb

    Model: PE30A (30MM)
    Float Level: 20MM
    Air Screw Turns Out: 3.5 turns out
    Needle Clip: 2nd from top
    Pilot: 50
    Main: 130

    I switched it to the above statement. About to try it out but one question on the air screw turns. Is one turn really a complete turn or just a turn with screw driver which would really kinda be half turn? I know kinda stupid question sorry lol
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  7. 10-25-2016, 06:12 PM #7
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    TwiZ
    TwiZ is offline At The Back Of The Pack Arm chair racerFirst time rider
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    One complete turn and half turn,or 3 half turns

    1984 Honda 200X
    1984 Honda 200S Bonecrusher
    1975 Jeep CJ5
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  8. 10-25-2016, 06:24 PM #8
    seth6025
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    ok thanks...it still seems to be doing it but I am gonna let it sit and try again because it will come out of it anyway after going through the gears. One more note is it has a FMF slipon but the expansion chamber looks original. And I have a makeshift air filter on it right now cause the old one fell apart when I touched it. It is still wraped in foam though. Would I need to make any other changes to carb to take into account the slipon? Also I am at sea level here
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  9. 10-25-2016, 06:30 PM #9
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    TwiZ
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    Geeze...hope it hasnt been suckin in pieces of foam. Idk yaeger or the other guys here could be more helpful in that department. Be different if i was there i could have a better chance of helping dial it in

    1984 Honda 200X
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  10. 10-25-2016, 06:35 PM #10
    seth6025
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    Don't think its sucked anything in....it still has the inside metal filter with the foam around it. I did just notice the plug wire was a little loose going onto the plug so I tightned that up and will try again....thank for the help and quick responses
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  11. 10-25-2016, 07:00 PM #11
    seth6025
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    nope no luck still doing it.......is the pj34 34mm a good upgrade?
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  12. 10-25-2016, 07:48 PM #12
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    TwiZ
    TwiZ is offline At The Back Of The Pack Arm chair racerFirst time rider
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    With the right mods probably. Gotta be careful,if you go to big your bottom end will suffer dramatically. With what you got going on i dont see you benefiting from a bigger carb. I could be wrong,not big on two smokers,but i know for sure a 4 stroke will be a boggy pig. You get it dialed in that things gonna rip

    1984 Honda 200X
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  13. 10-25-2016, 08:05 PM #13
    seth6025
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    ok thanks for the input.....I will look into it further......one other question as I am new to 2 strokes, should it be smoking at idle or no....The way it is right now it don't smoke at idle and only a bit on throttle.....I can turn the air screw in a bit and it will smoke. Guess I just don't wanna be running too lean. I know my sled smokes like a bitc! but its a tripple
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  14. 10-25-2016, 09:00 PM #14
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    yaegerb
    yaegerb is offline yaegerb The day begins with 3WW
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    So do you have the oem airbox and lid on? I would try and get this carb running right before investing in an upgrade. It should smoke some on idle and clear out when running down the road.

    Have you checked for airleaks around the carb and intake boots?
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  15. 10-26-2016, 07:38 AM #15
    seth6025
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    Yes it has the oem airbox and lid on....there are a few small holes in the top of the airbox (maybe drilled or normal not sure) I have checked the boots for cracks and did not see any and the carb slides into them pretty tight. Its just weird that it does this and then comes out of it. Its not a huge deal but I know something is not right and that bugs me lol
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