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Backfiring, engine dies
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  (#1)
opossum puncher
 
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Backfiring, engine dies - May 14, 2007, 12:20 PM

Background:
1998 Kawasaki ZX6R, 20000 miles. 1999 Motor, 13000 miles. Full Yosh, Jet kit, ignition advancer tuned by Rick Beggs summer of 2005.
Plugs were replaced at that time, which was probably 5000 miles ago.
Bike is kept in a shed and ridden verry regularly.

As of Friday the bike began backfiring. First happened on 495 at 75mph, constant throttle, two pops and bike lost power, then rode regularly from there home. Over the weekend again a few back fires. Today on the way to work backfired twice on 66, then on the exit ramp to 495 while rolling on the throttle backfired and cut out. After a min it started up and rode fine till 95 south, where two more back fires occured.


My thoughts: Wednesday of last week I was low on gas, very very low, so I stole about 1/3 to 1/2 a gallon of gas from my dads lawn mower can. The gas I dont believe to be older than a few weeks, is 87 (Rick told me to run only 93). However I have already gone through half a tank of good gas (93)

Plugs are a bit old, I had planned on doing them this week anyway.

I also planned on having the carbs synched the week after next while I am out of town.

I need to fix the petcock, it dose not switch over to reserve/there is no gas in reserve, so once I run out when the knob is in the on position there is 0 in the tank.

I have concerns about cam chain tensioners but only because that is why I have a 99 motor, I destroyed the first one when the tensioner went and chewed the motor apart. However I do not hear any noise from the tensioner.


Thoughts, Ideas? Halp.


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#47 GODSPEED BAMBAM
 
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May 14, 2007, 12:30 PM

Sounds like the bike is running rich and over time has fouled the plugs. Check this site out for tuning help. http://www.factorypro.com


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May 14, 2007, 12:34 PM

any chance that the fuel for the mower had some premix in it? dont know if that would do it, but its a thought.
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May 14, 2007, 12:41 PM

Dodge, thanks Ill give the site a try. I do know (Rick told me) that at idle and low RPMs the bike dose run richer than Rick would have liked, he ran out of adjustment on the needles and said to get the factory pro titanium ones if I could.

ECK, The gas should not of had any premix, the mower is a 4 stroke.


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May 14, 2007, 12:58 PM

What do the plugs look like? http://www.pdm-racing.com/features/plugs.html
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May 14, 2007, 01:00 PM

Quote:
Originally Posted by nunyadambusiness
They are these round thingys with a metal thing sticking out to a white thingy with black stuff all over.


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May 14, 2007, 01:11 PM

.... "I am serious and dont call me Shirly"

Nunya,
Have not had a chance to pull them, hoping to take a peak tonight, regardless they are getting replaced, I should of done it when I first started riding this spring.


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May 14, 2007, 01:18 PM

"I picked the wrong week to quit sniffing glue!" I love that movie!!! Lloyd Bridges was the man!!!


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May 14, 2007, 01:34 PM

Quote:
Originally Posted by zx6rfool
.... "I am serious and dont call me Shirly"

Nunya,
Have not had a chance to pull them, hoping to take a peak tonight, regardless they are getting replaced, I should of done it when I first started riding this spring.

^ u are da POOP B-RAD!!!
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  (#10)
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May 14, 2007, 01:55 PM

Maybe fouled plugs but I would be suspect of it creeping up all of a sudden like that. I would check your voltage coming out of your rectifier and at the plugs. Easiest change is doing the plugs so start there.

If the cam chain jumped a tooth you would know it. I would run like sheet.
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May 14, 2007, 08:56 PM

The plugs has some ash as you can see.




According to a chart "...leading to misfire and hesitation. Caused by excessive amounts of oil in the combustion chamber or poor quality fule/oil."

The air filter had a good amount of filth on it, which I cleaned, mostly, the rest I will do later with the proper solvents, and re oil. The fule filter looks like crap and I am ordering a new one, that will take a week.

Hopefully this will solve the problem, if not I will resurect this thread shortly.


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Last edited by zx6rfool; May 14, 2007 at 09:18 PM.. Reason: fixing pic
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  (#12)
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May 14, 2007, 09:58 PM

Plugs aren't fouled enough to cause that noticable of a problem. I would look at voltage and fuel delivery as you are sort of doing now.
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May 14, 2007, 11:19 PM

is it possible that the gas you put in the bike from the lawnmower had build up condensation and therefore a good amount of water mix.
just a thought


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May 15, 2007, 08:28 AM

Water is a theorteical probability, however the amount from 1/3 to 1/2 a gallon, after 2 1/2 gallons of fresh gas have gone through is negligable.

Gonna give a friend with a good multimeter a hollar and we will measure whats comming out of the regulator tonight.

Over the week I will eventually pull the carbs and give them a cleaning too.

What a pain, Id rather be riding.


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May 17, 2007, 09:54 PM

Pulled the tank, drained and started inspecting everythingtonight.

Petcock will be a simple fix, I have ordered replacement gaskets, looks like over time it just lost its sealing ability.

Fule filter is definitely in need of replacement. There was sediment in the bottom once I put some carb cleaner thought it.

I will need to tear the carbs down and clean them out.

Now to the bad news.

In the tank it looks like there is some rust. Multiple spots, including along the seam down the clutch (left) side of the tank.

Nunya, Harvey both of you have restored tanks. I need to know the details, if either of you could PM me Id really appriciate it. I have to decide now between restoring, and replacing.


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