little advice on backfire - Kawasaki Versys Forum
 
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post #1 of 18 (permalink) Old 11-27-2011, 05:53 PM Thread Starter
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little advice on backfire

violent back fire and surge when i was rideing today. first of such problem ever. i think it might be the timeing or valve issue or any other thoughts i might check, dont have any time now but will start to braker down in a few weeks. Thanks, jet:feedback
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post #2 of 18 (permalink) Old 11-27-2011, 10:27 PM
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How much mileage on your 08, and when does it backfire exactly? Are you on original spark plugs?
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post #3 of 18 (permalink) Old 11-27-2011, 11:44 PM
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mine backfires sometimes when i twist the throttle at very low revs
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post #4 of 18 (permalink) Old 11-28-2011, 03:14 AM
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Originally Posted by fineout View Post
mine backfires sometimes when i twist the throttle at very low revs
Mine did too with aftermarket exhaust, until I adjusted my main throttle sensor (TPS).
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post #5 of 18 (permalink) Old 11-28-2011, 04:05 AM
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jettexas, are u on stock exhaust? What actions caused it to back fire (like decceleration, off throttle ?)

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post #6 of 18 (permalink) Old 11-28-2011, 07:48 AM
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Pretty sudden this backfiring. See if the anything has come loose causing mixture being too lean. Any chance taken bad fuel?

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post #7 of 18 (permalink) Old 11-29-2011, 05:23 AM Thread Starter
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about 25k miles maybe 15k on the current set of plugs. seems to happen at random times starting out and at speeds. happend maybe 4 times on a 20 miles ride.
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post #8 of 18 (permalink) Old 11-29-2011, 06:21 AM
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Start by replacing spark plugs, while checking for any vacuum leak. Have you checked your valve lash clearances yet?
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post #9 of 18 (permalink) Old 11-29-2011, 02:38 PM
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are you twisting the throttle hard at like 1500rpm-2000rpm... that would cause bucking and sputters because you have no power then. but year first sparkplugs... what mods do you have?
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post #10 of 18 (permalink) Old 11-29-2011, 09:49 PM
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sounds like plugs to me.

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post #11 of 18 (permalink) Old 12-05-2011, 10:01 PM
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Check the exhaust pipes at the head. If the fasteners have backed off, any air leak will cause backfires.

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post #12 of 18 (permalink) Old 12-18-2011, 11:12 AM Thread Starter
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well i have changed the plugs they looked good and cleaned the air filter. seems to be happenning more in slow excelleration. also ran a batch of sea-foam carb and injector cleaner through it. still is happening and maybe a little more. do you think i should have bought a new airfilter? all i did was clean the old one and put it back. but with the change of cleanning the airfilter seems to be happenning more. I checked the timeing and it looks good.

being that the backfire is happenning on excelleration that would lead me to think it is in the intake somewhere. any thoughts on where I might be to check for an intake vacume leak.

thanks
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post #13 of 18 (permalink) Old 12-18-2011, 11:51 PM
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Backfiring through the intake or exhaust? If it's intake on acceleration then it's too lean. Could be vacuum leak, low fuel pressure, possibly bad fuel, water, or dirty injector.
Maybe sink the throttle bodies. If it's intake backfire I guess it could have blown the vacuum caps off where you sink them.
I guess it could be the tank isn't venting like it's suppose to.

It is possible that it's ignition. I have seen many coils break down under acceleration in the automotive world but that's more of a dead miss and not so much backfiring.
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post #14 of 18 (permalink) Old 12-19-2011, 12:05 AM
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Originally Posted by jettexas View Post
well i have changed the plugs they looked good and cleaned the air filter. seems to be happenning more in slow excelleration. also ran a batch of sea-foam carb and injector cleaner through it. still is happening and maybe a little more. do you think i should have bought a new airfilter? all i did was clean the old one and put it back. but with the change of cleanning the airfilter seems to be happenning more. I checked the timeing and it looks good.

being that the backfire is happenning on excelleration that would lead me to think it is in the intake somewhere. any thoughts on where I might be to check for an intake vacume leak.

thanks
You mean under moderate acceleration? Does it happen more at near 2800 rpm (where the A/F mixture is normally leanest)? Have your tried adjusting your main throttle sensor (TPS)?

Have you adjusted your valve clearances and synchronised your throttle bodies yet?

Do you have an aftermarket exhaust? If so, have you sealed off the PAIR valve?

Last edited by invader; 12-20-2011 at 06:49 AM.
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post #15 of 18 (permalink) Old 12-19-2011, 08:56 AM
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Do you have an aftermartet exhaust? If so, have you sealed off the PAIR valve?
My 2008 V, purchased used, came with a Leo Vince, and I get some occasional backfire on de-accel.

What is the PAIR valve, and how do I seal it off?
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post #16 of 18 (permalink) Old 12-19-2011, 09:33 AM
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My 2008 V, purchased used, came with a Leo Vince, and I get some occasional backfire on de-accel.

What is the PAIR valve, and how do I seal it off?
The pair valve bleeds air into the exhaust to help the catalyst burn off hydrocarbons. When the cat is removed, it's no longer necessary and it then causes backfires.

Lift the tank, and you'll see a large hose coming out of the airbox. Pull it off the fitting and put something inside to plug it, then put it back on the fitting. Replace tank.

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post #17 of 18 (permalink) Old 12-19-2011, 09:55 AM
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Thanks... I'll do it when i clean the air filter!
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post #18 of 18 (permalink) Old 12-19-2011, 10:11 AM Thread Starter
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I'm going to try synchronizing my throttle bodies and adjusting my main throttle sensor when i get time. Thanks for all the advice i will let yall know what the results are.

JET
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