Spark plug on 94 Yamaha 250 4x4 keeps fouling out?

Question

It was running fine then we had oil changed and put in new spark plug. then it started running bad and hard to start. So We took it to different place and they said it was wrong plug so they put in different plug and it started right up and started fine first 5 or 6 times. Then it wouldn't start. After a few tries got it to start and then it ran rough and won't hold an idle . Checked spark plug and looks black and fouled out again. Does anyone know what would keep causing this?

Answer 1

You are probably flooding the spark plugs with gas. Don't press the gas when you are starting it. You can pump it a few times. But not too much cause that's when it gets flooded with gas then won't start. Maybe 2-4 times. Check with the manufacturer to make sure you have the right spark plug.