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

Could be your fuel pump or your fan is still running.

If it's the fuel pump. You should hear the same sound when you turn the contact on in the morning.
If you can only hear it when the bike is warm and you shut the engine down, it's likely it's the fan spinning. Some Kawa's do it, some don't. My old GPX600R did it. Sometimes it ran (after I shut the bike down) for upto 15 minutes (in hot weather),but my ZZR1400 doesn't do it at all.
My old GPX used to buzz/whistle form the gas cap too, but that shouldn't have anything to do with turning the power on/off.

Hello have you try draining excess oil from engine, I would try that first and see if you can kick it .

I’m happy to assist further over the phone at https://www.6ya.com/expert/michael_18b4936ebf017b21

Use SAE 15W40 for bikes from Castrol, BanRay or any motorbike oil brands. You need about 2.3 litre and a new oil filter suitable for your bike. The oil filter normally lives on the front part of you bike just ahead of your exhaust pipies.
Good enough for thumb ups?

pull your clutch in on the left handlebar push the shifter lever down and let you clutch out slowly while giveing the bike a lil bit of gas. But if you don't know how to ride i wouldn't be jumping on a kx 250

Thats a strange one.For some reason it may be just locked in 2 gears at one time.Lift the bike of the ground onto some sort of stand.Don,t start it.Take the plug out.Run the rear wheel backwards and forward.Clicking the gears at the same time.This might 'unlock' a wound up box.Being off the ground you can't hurt it.Just try different gears and in both directions.I hope this helps,because its a strange problem if all was ok beforehand.Thanks

sounds like too much oil in the mix add more gas & clean spark plug
Cheers Rob

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

NGK brand spark plug BR8ECMVX is the stock plug for the bike. The proper gas / oil mix is 32 to 1. That means 4 ounces of 2 stroke oil per gallon of gas. The posting was not clear as to just what the problem is. If you are burning up plugs there may be a air leak in the intake system making the bike run lean. A lean fuel mix runs hot.

hi murray,

nice bike you have there.

have you checked on the carb ans see if the jet is right and the mixture is normal, this is usually the case if the carb is not tuned right.

better of reset the card, open it clean it, then set to default even if you are using your mixture of gas and 2t. just set to factory default. once it starts give it a few run, 1-2 hours, then set it to how you want your mixture to be.

hope this helps,

regards,

voodoo

It seems your piston ring needs to be replaced since its worn out. i am saying so because of the way the bike is being used. Since its 2 stroke, engine oil from the sump is making its way int the firing chamber and depositing on your sparkplug. Therefore pay special attention to the last ring, thats the one which uses the oil for lubrication...........sodeep