Take the muffler apart, and lock-tite it real good before
you run it. They come loose....and after they get all oiled up....they don't hold lock-tite as well. Make sure the carb
is down tight on the o-ring.

I use a Fox Miracle plug in mine....it has been in there for
two years....won't burn out....15% Powermaster fuel.
Mine took a while to break-in....I found out not to baby
it too much....let it run....

Dave.