Hi Jeff,
I can't even get a splutter out of either motor, even with starter fluid, pull them off and put back on a standard base and they will fire up first pull. I have had this problem with everyone of these 600's fitted with the PT motor. Fuel is new just mixed it, belt and spindle seem fine, I do have shoulder issues that have developed over the last few months that doesn't help but on a standard base no problems starting them