wont start

[joesawyers24]

I have had my 91 kdx 250 for a couple months. It ran strong and very reliable. But last week my neighbor put mix in it he used in his weedeater. I didnt know it. We started bike it ran fine for about a minute. Then just kind of bogged down and died. Now it wont start at all.

 

[dirt bike dave]

Drain the gas out of the tank and the carb float bowl. Replace with fresh premium gas, with good oil at the right mix.

Might as well put in a new spark plug (the stock KDX jetting is rich, and plugs foul easily). Try again.

If it doesn't go, you will need to make sure you are getting spark.

 

[EYY]

I can almost guarantee that the pilot jet is blocked. Take apart the car and clean both jets, regardless of how clean they look. Good luck! :)

 

[joesawyers24]

Thank you. I took the plug out earlier today and cleaned it. Its getting spark but wont start. I havent had a chance to change the fuel though. i hope that will do the trick?

 

[dirt bike dave]

An old plug can spark when you test it outside the bike, but still be weak.

Just go ahead and replace it - they don't last forever.

FWIW, low compression from worn rings can cause difficult starting. Chipped, warped or cracked reeds can also cause hard cold starting.