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  1. Question Why is my blaster backfiring?

    Ok, let me explain. My blaster was running fine. I did not ride it for a month. I tried to start it and it ran and sputtered and died. So, I then thought...I know it needed an overhaul. So I rebuilt the top end. I put new reeds in also. I then regapped the spark plug and tried again. Same problem! except this time it back fired and sputtered and died, lots of smoke. I pulled the spark plug and it was very wet. Hmmm. I then overhauled the carb. (thinking I had a clogged jet or something from setting a long time.) Tried again after the overhaul. SAME PROBLEM!! then my thoughts went to this...Could it be the gas? Todays gas is not very good anyway. I use 91 octane and add 101+ octane boost to the 1:32 mix. Do you think the gas could've broke down in a month enough not to work? I poured some of the gas on the patio and set it on fire to see how it would re-act. It did catch on fire but not as I thought it would. Help, what do you experts think? I have been working on 2-strokes for about 4 years now. I never came across this problem.

  2. #2

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    Jets,air in the lines, dirty carb,

  3. #3
    Join Date
    Jan 2011
    Location
    Wi
    Posts
    407

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    woodruff key sheered off timing screwed.
    GASGAS WILD 240HP MODS: It needs none its everything you want in a quad from the factory.

  4. #4
    Join Date
    May 2010
    Location
    coopersville,mi
    Posts
    227

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    another thing is i never use octane boost some of that stuff eats away at the reeds

    1989 Trx250r: +4mm crank, mx ported, airbox removed, vforce 3 reeds curtis sparks TT pipe
    I'M THE ONLY ONE WITH A 2 STROKE NOW IN MY FAMILY. AND I'M THE FASTEST LOL
    1969 Harley Sportster: a lot of work done to the motor
    1971 Firebird: my car
    1973 camaro: my dads car

  5. #5
    Join Date
    Jan 2011
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    octane boost does nothing been proven many times before. unless you are buying stuff from snow performance or adding methanol its a waste.
    GASGAS WILD 240HP MODS: It needs none its everything you want in a quad from the factory.

  6. #6
    Join Date
    Aug 2008
    Location
    ohio
    Posts
    2,694

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    check that fly wheel key, and if that aint it check yur timing marks on yur trans cogs...keep us updated

    don't use octane boost :(

    jenny is her name!
    2001 yamaha blaster

    1991 Honda CR 250R
    (under construction)

  7. Default

    Why do you think the timing skipped or something like that? IT RAN PERFECT WHEN I SHUT IT OFF. Then I started it and it would not start. Do you think it skipped when I turned it off? Or something? I will look at the timing. Also, I recently blocked off the oil injection doo hickey. lol. I pre mix my gas. And I will kill the whole 101+ Do you have an alternative gas additive that will raise 91 octane to approx. 97?

  8. #8
    Join Date
    Jan 2011
    Location
    Wi
    Posts
    407

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    methanol injection. No octane boost works it is marketed to schooks who wanna believe. Trust someone who builds and drives 600hp cars on the track it d ont work. you want octane boost mix in some turbo blue
    Last edited by dude54758; 06-22-2011 at 05:39 PM.
    GASGAS WILD 240HP MODS: It needs none its everything you want in a quad from the factory.

  9. #9
    Join Date
    Jan 2005
    Location
    Virginia
    Posts
    13,051

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    the only real alternative for higher octane is race gas or the equivilent.
    the only thing you should add to your gas besides the oil is some Sta-bil at the end of your riding season and then run about a half of a tank with that at least before storing it. it will help keep your carb from getting gummed up real bad while being stored. todays gas has way too much ethanol in it, and it's wrecking havoc on float needles and other parts inside of carbs. 2 stroke and 4 strokes alike.

    if you look at your flywheel, you will see a crank trigger tacked to the outside. if it does not line up with the coil pick up at the right time, you will have firing issues. a sheered flywheel key can cause this by letting the flywheel spin out of time on the end of the crank. also, the coil pick up should be within .020 of the crank trigger. you can use a match book to get you close if you dont have feeler gauges.

  10. Thumbs up

    Thank you, I have feeler gauges. lol. I will check this. Maybe something happened when I rode last. Don't remember. I will check this weekend. Thank all of you for your imput!