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Message: [QUOTE="dpawl, post: 1231570, member: 52146"] It ran 100% for quite a while, did this pop thing randomly every now and then... would come back for a bit, then happen again. Then it just won't go away now, but it wasn't anything gradual like a blown piston etc. Oh by the way it's a 4 stroke. And I assume the spark system is OK because it tries to rev up, and you can adjust the idle low to high and it sounds great, flawless infact. I am beginning to suspect a plugged exhaust pipe but I have never dealt with that. Hopefully we will see that as the case- we are going to remove the white brothers end cap and rings to see if that is the cause. [/QUOTE]