Originally Posted by baih
my hyper 21 is a pull start. i couldn't get this motor to run for about two weeks. someone told me to seal the pull start. mine runs fine now. it starts right up and holds a tune. try sealing the back plate.
Yep, I had one in my Pirate 10. Same thing, it ran horrible. The guy at the LHS suggested sealing it. I had some excess fuel by the pullstart. So I sealed up the back plate. It ran like a banshee after that.
I've been doing it ever since.