I am having troulble with my 92 quadrunner 4wd. it runs fine when u first start it but after it runs for 20 minutes it runs rough for a minute and then shuts down. i pull the plug and it is completly fouled out can any help . thanks

 

Depends on the type of fouling you have. Compare this chart w/ your own plug. You may not be getting a hot enough spark, plug could just need replaced, or you may need a ring job. That is a 4stroke machine correct? Is there a bluish/blackish color to the exhaust?

 

it is carbon build-up. yes it is a four stroke. the exhaust looks normal. I will try a cooler plug next adn see how that goes.