Sputtering and cutting out! Help! - Kawasaki KFX450 Forum :: KFX450HQ.com
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post #1 of 10 (permalink) Old 11-17-2019, 07:36 AM Thread Starter
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Sputtering and cutting out! Help!

I have a 2009 KFX 450r with cp 98mm piston, +3 hot rod, fuel custom intake, open air box, NGK jeep coil, full fmf power bomb Ti 4.1 exhaust, PCv and auto tune. Low to mid throttle it starts to shit and pop then clears up. Once in a while I'll go thru the gears and runs clear. Thanks in advance!
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post #2 of 10 (permalink) Old 11-18-2019, 02:29 AM
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Quote:
Originally Posted by Jerry Moseley View Post
I have a 2009 KFX 450r with cp 98mm piston, +3 hot rod, fuel custom intake, open air box, NGK jeep coil, full fmf power bomb Ti 4.1 exhaust, PCv and auto tune. Low to mid throttle it starts to shit and pop then clears up. Once in a while I'll go thru the gears and runs clear. Thanks in advance!
What does your spark plug look like...sooty black, coffee brown or white...???

Also what octane fuel are you running...105~112 octane is recommended 13.5:1+ piston compression

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Last edited by Dust Devil; 11-18-2019 at 02:31 AM.
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post #3 of 10 (permalink) Old 11-18-2019, 11:40 AM
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I have just built a kfx with +3 hot rod, stage 2 cam, dasa exhaust, PVC autotune, fci intake, jeep coil, and dasa has the head porting it right now. I havent quite got it back together yet. I'm wondering have you had the chance to ride yours for a while with the current mods, and it was running correctly?

And cutting out is usually lack of fuel. What kind are you running?

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post #4 of 10 (permalink) Old 11-20-2019, 07:51 PM Thread Starter
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Im running 110 VP ....I checked the screen and fuel pump. Appear to be ok and working. Don't have a fuel pressure gauge so not sure if it's up to pressure. I did order a rebuild kit anyway. The roll over sensor has been glued already. Made sure the map sensor vacuum is intact. Im really hoping the pump rebuild does it
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post #5 of 10 (permalink) Old 11-20-2019, 07:53 PM Thread Starter
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Vp 110 plug looks like a coffee color
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post #6 of 10 (permalink) Old 11-20-2019, 07:59 PM Thread Starter
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If the pump don't do it im going to try a different coil
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post #7 of 10 (permalink) Old 11-20-2019, 08:46 PM
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I would take a peek at the harness ground wire on the frame right behind the gas tank just to make sure.
Widebands die over time. It will stop reading clearly at low rpm before it doesnt read well at high rpm.
Do you know your map is correct?

Spark plug color is right. But if it just started this than it would look right.

Make sure the wire from the coil to the plug is not coming lose/out of the coil.

At high rpm the spark plug is almost lit constantly so if there were a misfire, here and there, then you would notice in low rpm far more than at high rpm.



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post #8 of 10 (permalink) Old 11-21-2019, 02:01 AM
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If your fuel is leaded it destroys wideband sensors and that's what your pcv autotune uses. If its leaded I'd switch the wideband out first. I'll be using sunoco unleaded 260GT fuel.

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post #9 of 10 (permalink) Old 11-21-2019, 01:24 PM
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I’ve had a failing ignition coil and low fuel pressure cause the exact same issue

If your not running an upgraded coil it’s a good time to pick one up

08 KFX450r- DASA, FCI, Stg 2 Hotcams, Wiseco FI, Dynatek Coil

Race Tech dual rate front springs, GT thunder XC Link and Race tech spring, LSR +2 Arms and LSR Axle

Poly Case Saver, Streamline Stabilizer, PRM Skidplates, Pro Armor Bumpers, Tusk Heel Guards, IMS 3.7 tank, 6K HID

Next up: Dasa Port Job, JE Pro 12 12.8 piston
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post #10 of 10 (permalink) Old 11-21-2019, 01:33 PM
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I agree...! check your O2 sensor...!

Check your fuel pressure 43 psi...Also check your injector is misting the fuel properly or starting dribble...

Also check your map in your software to be correct..also check for the latest firmware update from dynojet...

If everything checkout to be good...

Check your compression ratio

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Save 5% off $100 or more, use coupon code: KFX450HQ

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(Discount Tire)
At The Store: www.discounttire.com
To Your Door: www.discounttiredirect.com
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