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 back fire problems KQ 450

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darkstar
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PostSubject: back fire problems KQ 450   Tue Dec 15, 2009 4:12 pm

My 2008 is back firing more than usual , plug looks good.
What are other causes ?
Think the valves are out of sdjustment ? It seems to do it just whenever .
???
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bamajeepjunkie
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PostSubject: Re: back fire problems KQ 450   Tue Dec 15, 2009 6:13 pm

Is the gas fresh? It could be the valves.
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PostSubject: Re: back fire problems KQ 450   Tue Dec 15, 2009 9:00 pm

check the Valves on it....

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Dan
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PostSubject: Re: back fire problems KQ 450   Tue Dec 15, 2009 11:36 pm

Cracked exhaust coupled with rich mixture when engine brake is engaged. This happens fairly often on BFs.
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PostSubject: Re: back fire problems KQ 450   Tue Dec 15, 2009 11:43 pm

Dan wrote:
Cracked exhaust coupled with rich mixture when engine brake is engaged. This happens fairly often on BFs.

his is a KQ...it don't have a brake like the Brutes have.

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PostSubject: Re: back fire problems KQ 450   Wed Dec 16, 2009 12:35 am

t doens't matter what the machine is. If an exhaust header is cracked and can suck in air, and if the fuel mixture hasn't burned in the cylinder, a back fire will probably happen.
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PostSubject: Re: back fire problems KQ 450   Wed Dec 16, 2009 12:38 am

Dan wrote:
t doens't matter what the machine is. If an exhaust header is cracked and can suck in air, and if the fuel mixture hasn't burned in the cylinder, a back fire will probably happen.

All I was saying was it don't have a engine break like the Brute has on it.

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PostSubject: Re: back fire problems KQ 450   Wed Dec 16, 2009 12:27 pm

Cracked exhaust ? I looked everywhere i cant see or feel a crack .
Crap how could that have happened.

How do i check the valves on that model or point me to a link where someone does it .
Shoot i hope im not messin it up .
It back fired 8 times in about 40 miles.
I used to do valves on old VW's and older chevys but im cluless on the KQ but i need to learn and fast.
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PostSubject: Re: back fire problems KQ 450   Wed Dec 16, 2009 2:10 pm

These guys may have more info.

Quad Crazy

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PostSubject: Re: back fire problems KQ 450   Wed Dec 16, 2009 2:12 pm

My 450 KQ did that as well...it did it worse when it was cold...I just now remembered...lol. co co I called and they told me that is was the cold air....cause mine only done it when it was cold....but I adjusted the valves anyway....I have the specs if you need them. Not sure if it was really cold air but it stopped after the valves were correct.

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Last edited by Bootlegger on Wed Dec 16, 2009 2:27 pm; edited 1 time in total
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Dan
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PostSubject: Re: back fire problems KQ 450   Wed Dec 16, 2009 2:25 pm

Dirt Dobber wrote:
Cracked exhaust ? I looked everywhere i cant see or feel a crack .
The only sure way to detect a crack is to pressure check it. An easy way is to rev the engine with flow restraint on the end of the exhaust. Then feel for hot gases escaping from the header pipe. You can sometimes hear and see the gases blow out.

Just keep looking, you will find the cause.
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PostSubject: Re: back fire problems KQ 450   Wed Dec 16, 2009 7:13 pm

My Big Bear was back firing at times and losing throttle the last time I went to Brimstone and it end up being a combination of stale gas and some debris built up around the filters on the shut-off valve mounted to the tank....I don't know if the KQ's have a similar set up as far as the fuel shut off and all, but I drained my gas...pulled the valve off and cleaned the filters, put new gas in and mixed in some SeaFoam with it to flush anything that might have gotten into the carb and it has cleared up....I also changed the spark plug while I was at it because it had been a while since I put a new one in it.
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PostSubject: Re: back fire problems KQ 450   Thu Dec 17, 2009 7:22 am

Mr. Dobber,

I know that you are on the NYROC site and we all know that the NYROC site is the King Quad Guru site. I found this post down there today and though it might help you.


NYROC wrote:

- Backfires.

A lot of owners have commented that every once in a while their
stock King Quad might give out a loud backfire while decelerating. This
is normal. The King Quad with it's EFI and many sensors is able to
meter fuel for all operating conditions much more closely and
accurately than a carburated motor. Suzuki has taken advantage of this
on your behalf to run the motor close to a lean condition in order to
maximise fuel economy. You will find yourself getting much better fuel
milage on a King Quad than many similar sized but carburated ATV's.

The tradeoff is the odd bang. Nothing to worry about (unless you are hunting, I suppose


Follow this link if you want to see it.

http://www.nyrocatv.com/techtip.cgi?viewcat=11&viewtopic=511
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Moose
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PostSubject: Re: back fire problems KQ 450   Thu Dec 17, 2009 8:08 am

Is the spark arrester still in the end of the muffler?

If its has been removed that will cause it to backfire every now and again.
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PostSubject: Re: back fire problems KQ 450   Thu Dec 17, 2009 11:12 am

I don't know how fresh your fuel is...but I do know that this gas that you get nowadays with ethanol in it will seperate in a very short time. That will cause one to backfire too.
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PostSubject: Re: back fire problems KQ 450   Thu Dec 17, 2009 12:00 pm

Vamped450 wrote:
I don't know how fresh your fuel is...but I do know that this gas that you get nowadays with ethanol in it will seperate in a very short time. That will cause one to backfire too.

My fuel will only last about a month before it starts to detonate and backfires bad.
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PostSubject: Re: back fire problems KQ 450   Thu Dec 17, 2009 2:48 pm

I use to keep a gas can full and on hand at all times, not anymore, the gas just doesn't last.
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PostSubject: Re: back fire problems KQ 450   Fri Dec 18, 2009 2:03 pm

Yall all know that i run through the gas way to fast for it to go bad hehe. Wheeler

Seems like just about everything causes backfire , anyhow yeah Rooster i checked NYROC and learned how to adjust valves and it says there that the KQ450 's valves must be checked alot . Every 500 miles or so if im not mistaken however the KQ750 gets its initial valve check and one more then is supposed to be good to over 15,000 miles hail

I would have bought 2 750's had i known and for sure i see power steering in my future if i ever have any money.

For now though ive been sick from night riding in the cold rain so i havent done anything but i did get the Kimpex cargo thingie , real sweet for those longer rides or overnighters at the cove.

Ill let yall know what i find , Dan i havent been able to detect any cracks in the exhaust header .
Also the Zuki tech said i should bring it to him for valves and everything he said they were pretty tricky but NYROC has step by step directions hmmm.

Thanx for the advice fellows and happy trails.

When yall coming to the cove ? better hurry befor the rock harvesters demolish it all
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PostSubject: Re: back fire problems KQ 450   Fri Dec 18, 2009 2:52 pm

Got plug out and it looks dark but not sooty.
More of a shiny dark almost wet look the end of the plug is in great shape .
Oily if anything and black.
I really really cant find a exhaust leak either.
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PostSubject: Re: back fire problems KQ 450   Fri Dec 18, 2009 3:25 pm

Dirt Dobber wrote:
Got plug out and it looks dark but not sooty.
More of a shiny dark almost wet look the end of the plug is in great shape .
Oily if anything and black.
I really really cant find a exhaust leak either.

its way too rich if its oily and black looking. what mods do you have on it?

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PostSubject: Re: back fire problems KQ 450   Fri Dec 18, 2009 3:31 pm

At the moment im running it stock.
I was running a VDI in it .
It looked alittle oily not to bad however on second inspection .
Black more than it should be .
Spark arrester is out and its bone stock.
It back fired worse and worse on our last 50 mile trip and its doing it upon acceeration.
it would not backfire right now, IT S pretty cold but it seemed to be putting out more steam than usual for a second.
i plugged the exhaust and no leaks anywhere near the head at all , im sure of that.
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PostSubject: Re: back fire problems KQ 450   Fri Dec 18, 2009 3:35 pm

I would say alittle oily but not like syrupy or anything , would over oiling my uni filter cause it to run rich ? Or back fire , because i might need to clean it up a bit.
NYROC says valves need checking no matter wht , i think i can handle it maybe not today though.
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PostSubject: Re: back fire problems KQ 450   Fri Dec 18, 2009 3:59 pm

Check the valves...your plug should be brownish tint to it....Rooster did have a pic of his somewhere...I don't have any of mine. Is the VDI tuned right? I know they have some problems outta them.

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PostSubject: Re: back fire problems KQ 450   Fri Dec 18, 2009 4:32 pm

Im running the stock ECU ,,,,NOT the VDI.

Ok checking valves .
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PostSubject: Re: back fire problems KQ 450   Fri Dec 18, 2009 5:31 pm

Dirt Dobber wrote:
Im running the stock ECU ,,,,NOT the VDI.

Ok checking valves .

I have the specs if you need them....let me know.

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