suzuki king quad not staring - Suzuki ATV Forum
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post #1 of 10 Old 09-11-2019, 12:28 AM Thread Starter
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suzuki king quad not staring

ok so this past weekend i bought another king quad for cheap bring it home and it wont start. i knew this when i bought it but im having trouble diagnosing this one. has good compression and clean carb and blue spark on the plug, just wont run. i can get it to fire once or twice but never actually run. any help would be great, thanks in advance!
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post #2 of 10 Old 09-11-2019, 05:30 AM
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Check the valves. Worn or out of spec valves can be attributed to hard starts. First remove the valve inspection caps, and using a feeler gauge check the valve clearances. If out of spec, adjust then accordingly.


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2000 Suzuki King Quad 300 4x4
K&N Air Filter
2300 lbs Superwinch
Kenda Bear Claws (Rear 25X10-12) - (Front 24X9-11)
Differential Lock Mod
14,000 + km/s
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post #3 of 10 Old 09-11-2019, 11:26 AM Thread Starter
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Already checked they are also fine. Really seems like it loses spark after one or 2 fires.
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post #4 of 10 Old 09-12-2019, 03:58 PM
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What year is this Quad?

Spark plug wet or dry?

My bet that it isn't getting enough fuel.



However, I just did battle with a snowmachine that would basically do the same thing. Fire and then die. Pull the plug and check for spark and it was a nice blue spark. Put it back in and try it, pop pop, die.

I happened to have a new CDI and coil for it so I replaced it all. Verified that I was getting voltage out of the CDI to the coil. Put the spark plug in and pop pop die.

Replace the spark plug with another one and same thing. I tried 3-4 different spark plugs and the only one that would give me a blue spark was the one I pulled out. The rest of them were dead. I pulled a spark plug out of another machine and put in this machine and it fired right up. Found out the original spark plug was failing as soon as it fired up. The others should have been compatible, but evidently were not.

technical: Machine calls for a BR9ES. Other spark plugs were BR9EYA and the Autolite equivalent. BR9EYA is nearly identical except for a groove in the anode. They should be 100% compatible. I use the BR9EYA in most of my other machines. In fact, one machine that calls for BR9ES runs better/longer with the BR9EYA's.


Anyway, the bottom line of this long-winded post is that your spark plug may work outside of the motor, but may be failing once under compression.

2013 Suzuki King Quad 500 AXi w/EPS
1990 Suzuki LT-4WD 250
and lots of snowmachines
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post #5 of 10 Old 09-12-2019, 09:28 PM Thread Starter
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It is a 2000 king quad 300.
I have replaced the spark plug already once dosnt look wet. I have tried starting fluid and it does the same thing, i dont think its a fuel issue. I have been thinking cdi box but not sure mabe i will try another fresh plug and go from there
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post #6 of 10 Old 09-13-2019, 06:44 AM
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According to my owners manual, the 2000 Suzuki King Quadís 300 standard plug should be NGK DR7EA. And when itís running hot, it suggests utilizing NGK DR8EA.


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2000 Suzuki King Quad 300 4x4
K&N Air Filter
2300 lbs Superwinch
Kenda Bear Claws (Rear 25X10-12) - (Front 24X9-11)
Differential Lock Mod
14,000 + km/s
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post #7 of 10 Old 09-23-2019, 05:09 PM Thread Starter
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update. so i got the new plug in and its doing the exact same thing any other ideas?
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post #8 of 10 Old 09-24-2019, 10:50 PM
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I'm still leaning toward lack of fuel. Pour some gas into the spark plug hole. Either that, or you have a compression issue.

2013 Suzuki King Quad 500 AXi w/EPS
1990 Suzuki LT-4WD 250
and lots of snowmachines
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post #9 of 10 Old 09-25-2019, 11:00 AM Thread Starter
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still the same 1 fire and then nothing. its also worth mentioning the electric starter is bad on it i can only assume from the previous owner attempting to start it over and over, and the cluster with the speedometer and ignition switch have been swapped out also by the previous owner. i assumed it was done correctly because the key works to cut spark off but its possible it wasn't.
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post #10 of 10 Old 09-26-2019, 05:33 PM
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1 fire then nothing points to not getting enough fuel, still.

2013 Suzuki King Quad 500 AXi w/EPS
1990 Suzuki LT-4WD 250
and lots of snowmachines
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