Question about 2003 kawasaki KX 250

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I have a 2003 kx 250 with full pro circut exhaust im runnin 50:1 whats the best plug to use?

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Run 40:1 for starter wull seize engine iff not enough oil and the plug use a BR8EG the g stands for racing use or the BR8EIX IRIDIUM PLUG

Posted on Oct 08, 2009

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Whats up with my bike?

jet size and exhaust muffler are not connected
failing at high rpms indicates a problem coil or capacitor or failing ignition control module
if it has points or cdi ignition it could be from worn shaft that is wobbling at speed causing the miss

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Jun 09, 2010 | 2003 kawasaki KX 250

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What could be causing a 2001 kawasaki kx 250 to continue burning spark plugs out?

incorrect jetting
incorrect ignition timing
incorrect plug heat range(could run a 9 or 10)
intake leaks
exhaust leaks
incorrect fuel oil mixture
is it burning the electrode off or carbon fouling the plug
sorry for the long list, there is probably a few you might discount as you have already checked

Apr 26, 2010 | 2003 kawasaki KX 250

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Mar 10, 2010 | 2003 kawasaki KX 250

1 Answer

My 2003 sx 250 is fouling plugs at cold starts etc

Why 50:1?
All bikes should be 32:1, and then jet to match that.
Your oil is fine, and yes...go smaller on the pilot.

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Motorbike wont start after running engine kawasaki kx 250 if i ride my bike for 2 minutes or 50 minutes when ishut down the engine it will not start again until i clean the spark plug

possible bad rings allowing excessive oil seep up and wash spark out on next fire. do a compression check, ck for proper spark, and fuel....hope this helps

Sep 13, 2009 | 2003 kawasaki KX 250

1 Answer

My kx 250 backfires

Two stroke? never heard one backfire while running. But, a leak doesn't make it run better.

Jul 29, 2009 | 2003 Suzuki RM 250

1 Answer

My KX 250 keeps dying on me

try nexted hottest plug for ex. i had a b8eg standard and went to b7eg

Jul 11, 2009 | 2003 kawasaki KX 250

1 Answer

What oil ratio for a 250 kx 2003

i run mine 50:1, if i go 32:1 it doent burn clean and drips out the pipe

Feb 23, 2009 | 2003 kawasaki KX 250

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