I don't abuse my machine, but have been running it at over 50 mph average of 40 mph on dirt roads in eastern maine. It has been a great machine, but recently I had a plug fowl and I thought it was a carborator problem. When I brought it to the garage I was told it was a plug wire off, so he replaced the plugs put some gas treatment in it and said it ran fine. I was 60 miles into the woods on a 80 mile trip when I started to hear which I thought it was an exhaust leak. I stopped an thought it was a rock in the exhaust spring, but nothing so I continued on, the sound stopped so I thought the rock must have cleared. about 20 minutes later when descending down a hill my left plug blew out, the only thing that didn't happen was a gas tank didnt explode..So have I ruinned the engine, why did this happen?

 

Sounds to me that the left plug wasn't tighten I would check the right one also. As long as it didn't mess up the treads you shold be fine. If it did mess up the tread you will have to have them rethreaded.

 

Yep, I agree, It wasnt tightened properly. Hopefully theres enough thread left in the hole. If not, they make helicoil, repair kits for this.