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Thread: 250R backfired??

  1. #1
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    250R backfired??

    My 85250R has backfired 2 times out of 25 while trying to start it. Stock fresh top end, stock carb, Boyeseen reeds, FMF silencer with stock exhaust. Everything is fresh and spotless and otherwise seems to run perfect. Any ideas??

    Thanks!!

  2. #2
    Lots_Of_Nothing's Avatar
    Lots_Of_Nothing is offline So bombed at TF I needed both hands to hold my beer Teaching quads a lesson
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    change your spark plug.

    let me know how it works.
    Give me no lip and I tell you no lie.

    -TF 05' , And cant wait till 06!


  3. #3
    Tri-Z Pilot's Avatar
    Tri-Z Pilot is offline Check my feedback before buying from me Got the holeshot
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    Check your fuel mixture screw too.
    Current Rides-Soon to be 85 350X, 84 200X
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    86 250SX 85 Tri-Z (yellow) 85 Tri-Z (silver) 86 200x 01 Blaster 99 Blaster 85 ATC250R 86 ATC250ES 84 Tri-Zinger 60 ATC500R Project
    Originally Posted by atctim
    I prefer to be called a "3 wheeled American" I find the term "Trike People" very offensive and derogatory!
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  4. #4
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    Quote Originally Posted by Tri-Z Pilot
    Check your fuel mixture screw too.

    Well it wouldn't start first kick so I turned it out a bit more - with a 250R I can't hear the difference like I could with a 4 stroke so I don't know where the hell to put the fuel screw!!! I guess your saying it's jetting???

  5. #5
    Tri-Z Pilot's Avatar
    Tri-Z Pilot is offline Check my feedback before buying from me Got the holeshot
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    If you have had a sudden drop in temperature where you live its likely you have a lean pilot circuit. If your mixture screw is behind the slide of your carb (airbox side), turn it in to richen the mixture. If your mixture screw is in front of your slide (motor side) you turn it out to richen the mixture. Richen it up a bit and see what happens.
    Current Rides-Soon to be 85 350X, 84 200X
    PastRides
    86 250SX 85 Tri-Z (yellow) 85 Tri-Z (silver) 86 200x 01 Blaster 99 Blaster 85 ATC250R 86 ATC250ES 84 Tri-Zinger 60 ATC500R Project
    Originally Posted by atctim
    I prefer to be called a "3 wheeled American" I find the term "Trike People" very offensive and derogatory!
    SOON MY PRECIOUS!

  6. #6
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    ..............who cares.....it's a backfire thats all.... :?
    Wanna race? ;-)
    85' Tecate (still looking for entire front brake asembly...)
    bonanza mini-bike
    if you cant ride with the big boys...put it back on the trailer

  7. #7
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    If its backfiring two out of every 25 times you start it, and you are worrying about it, Id suggest upping your dose of prozac, and switching to decaf.

  8. #8
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    Quote Originally Posted by TimSr
    If its backfiring two out of every 25 times you start it, and you are worrying about it, Id suggest upping your dose of prozac, and switching to decaf.

    LMAO!

    Sorry DirtCrasher ...
    1986 Tecate
    1984 Tecate
    1985 Tri-Z
    1986 ATC350X
    1985 ATC250R (2)
    1985 ATC125M (2)
    1982 ATC70 - Original Owner

    175 TriMoto Frame with Pro-Tec Rear Suspension

    3-Wheelin' since '82

  9. #9
    lol

  10. #10
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    Quote Originally Posted by TimSr
    If its backfiring two out of every 25 times you start it, and you are worrying about it, Id suggest upping your dose of prozac, and switching to decaf.

    It was just a question. I haven't owned a 2 stroke in years but when I did they never backfired. Normally one of you might post the possible damage that may occur by an engine backfiring rather than a comment like that.

    I though maybe something was wrong with it but I'll take your reponse as "normal operation". Thanks for the help.

  11. #11
    2 out of 25 times its prolly just a cold start.

  12. #12
    Levithan is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    ROFL @ timsr! geez, talk about wake up joke for the masses!

  13. #13
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    Sorry Dirtcrasher, didnt mean to be insulting. Backfiring is a buildup of fuel that finally decides to ignite, usually from like an intermittent spark that didnt ignite each rotation. Common causes - bad plug boot, bad plug wire, or bad or fouled plug, when it happens a lot, but more often, its simply nothing to worry about, and its caused by the gas buildup you get from kicking something over a few times before it finally fires up.

  14. #14
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    Quote Originally Posted by TimSr
    Sorry Dirtcrasher, didnt mean to be insulting. Backfiring is a buildup of fuel that finally decides to ignite, usually from like an intermittent spark that didnt ignite each rotation. Common causes - bad plug boot, bad plug wire, or bad or fouled plug, when it happens a lot, but more often, its simply nothing to worry about, and its caused by the gas buildup you get from kicking something over a few times before it finally fires up.

    The thing is you have had some fantastic posts here and I've learned quite a bit from them - anyhow I was just curious as I am new to this motor. I'm running a bit rich to break it in and have fouled a couple of plugs so that makes more sense. Thank you :-D

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