2 stroke fouling plugs? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 14 (permalink) Old 03-21-2010, 11:52 PM Thread Starter
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2 stroke fouling plugs?

I am new to the 2 stroke dirtbike thing. I picked up a rebuilt ktm 250. The previous owner said he always mixed the fuel at 40:1 which is what Ive been doing. I use it just to pretty much play with around the farm/trail riding. Im using an NGK BR9ES plug. Any ideas as to why it's fouling plugs left and right?

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post #2 of 14 (permalink) Old 03-22-2010, 10:23 PM
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Too much oil in the mix. Should be closer to 60:1. Does it mix it itself? or do you pre-mix?

1992 W250-P-pump and some extra air, gone, but not forgotten.

2003 SVT Cobra

1984 Chevy K10

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post #3 of 14 (permalink) Old 03-22-2010, 10:39 PM
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too much will definitely foul plugs....but it will lubricate the hell out of the cylinder...

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post #4 of 14 (permalink) Old 03-22-2010, 11:25 PM Thread Starter
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Quote:
Originally Posted by BigRed Cummins View Post
Too much oil in the mix. Should be closer to 60:1. Does it mix it itself? or do you pre-mix?


It's pre-mix. I just cant understand why it's fouling and the previous owner had no problems at 40:1 (or so he says).

2008 Lariat, CC, SB, 3.73, stock 20's
-High idle mod

1987 Mustang GT
-331 CI A4 block
-95# injectors
-90mm TB
-80mm turbo
-Powerglide
-3.27 gear
-28x10.5 ET Drag


"The strongest reason for people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government." -- (Thomas Jefferson)
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post #5 of 14 (permalink) Old 03-22-2010, 11:55 PM
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What mixture does the manufacturer recomend? That is what you should go by.
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post #6 of 14 (permalink) Old 03-23-2010, 01:36 AM
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Everything I've found on KTM 250's from the manual says 40:1 - 60:1 ( I guess the company gives a fudge factor)...so try leaning it out a bit...slowly...after a couple tanks,..get it closer to 60:1...and see where it runs better.

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2005 F-250, CC,SB,PSD, MANUAL TRANNY

Icon 4.5" lift, 41" IROKS, and some other stuff

Special thanks to:


TrustedPerformance.com
KLMperformance.com
Black Ops Bumpers
FarmboyFabrications.com


TIRES AND WHEELS- 41" IROK Super Swampers, 20 x 10 AR Mojave Teflon-STEERING UPGRADE- Donahoe Racing Dual Stabilizers -FRONT SUSPENSION- Donahoe Racing 4.5" lift -REAR SUSPENSION- 6" Procomp Springs, Farmboy Fabrications Custom Traction Bars-FRONT AXLE UPGRADES- ARB Air locker/ 4.56 Precision Gears -REAR AXLE UPGRADES- ARB Air Locker/ 4.56 Precision Gears -ENGINE UPGRADES -SCT XCAL II w/ Extreme track file- ARP Headstuds - TRUSTED PERFORMANCE Stage II fuel and Oil system - ACCUFAB Intake Elbow - AFE Stage II Intake - MBRP Turbo back Stainless Steel Exhaust - MERLIN controls SPEED WIZARD-TRANSMISSION UPGRADES- Southbend 550+ HP Clutch -INTERIOR MODS-Gauge Works Quad A-pillar pod - Autometer Cobalt Series Gauges Pyro, Boost, Tranny - Cobra Inverter Remote Switch - Cobra Limited Edition Harley Davidson CB - Python Custom alarm system, wired into train horns - Hi-Lift Extreme jack w/ off road base -10,000 watt inverter - 15 gallons of air - Porter Cable 115 volt, 2.5hp Air Compressor - Rhino....Bed liner - EXTERIOR MODS- Harley Heads & Smoked tails- Crown SS braided Brake Lines -Custom Fabricated Front Bumper/ Brushguard w/ Custom Herculiner - (2) 8" Procomp Spotlights -(2) 5" Procomp Spotlights - (2) 5"Procomp Fluted lights - (2) 12 ton Recovery Shackles - Custom Fabricated Safari Rack w/ Custom Herculiner - (8 ) 3" x 5" Procomp Fluted lights - Grover...Triple Train Horns - Wilson 4' Fiberglass CB antenna - Stealth Bulbs Chrome signal bulbs - Dominator...Cowl Hood - Custom Herculined Rocker panels - AMP Research Powersteps - Bushwacker Cut-out Fender Flares - Ventshades - LEER Bed cap - Recon Line of Fire, rear light bar,...and a couple other things
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post #7 of 14 (permalink) Old 03-23-2010, 02:18 AM
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Check the air filter. A dirty air filter will make it run rich and foul plugs. I would not lean the mixture 60:1 is way too lean. If the air filter is dirty your problem is probably solved. Clean it with gas and let it dry, get some foam filter oil, lightly oil it, let it dry and put it back in and wfo. I always keep 2 filters so I have one to go in and not wait. If ur still fouling plugs I would change the jetting before I changed the mixture. If u need help with jetting let me know.

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post #8 of 14 (permalink) Old 03-23-2010, 05:25 PM
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try running 32:1 mix and ngk br8es plugs i did this with all my yz's and banshees and it works awesome aweso check your air filter and carb jets might be clogged

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post #9 of 14 (permalink) Old 03-25-2010, 02:27 AM Thread Starter
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Im going to look at the air cleaner. Ive heard this from a few people besides just reading it on here. Thanks for the help guys.

2008 Lariat, CC, SB, 3.73, stock 20's
-High idle mod

1987 Mustang GT
-331 CI A4 block
-95# injectors
-90mm TB
-80mm turbo
-Powerglide
-3.27 gear
-28x10.5 ET Drag


"The strongest reason for people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government." -- (Thomas Jefferson)
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post #10 of 14 (permalink) Old 03-28-2010, 08:31 PM
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60:1 for the mix is perfect. I'm not sure how you are riding the bike, but any 2-stroke is not meant to be ridden at low rpm for a length of time.
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