ORIGINAL: DKMILLETTE
my son's ZDZ Super 80 is a ***** to start too, I asked him to check and see what carb is on it. he has only had it since january and during a flight the spark plug blew out and stripped the threads in the cylinder. Has anyone ever heard of that happening before? Other than these problems it runs great, tons of power once it is running, I think the spark plug needs to engage more threads. ZDZ People need to look at this problem.
I read about your plug problem on your other thread and it's not a problem with the engine. The problem is the plug gets over tightened and it pulls the threads. The plugs only have to be tightened until the crush washer is crushed. If you pull the plug and you don't replace the washer, then you're asking for trouble. You're hounding on an engine that has an impeccable history, that produces more power and has less troubles than ANY other 80cc class engine.