Starter "O" ring is new, I haven't had any problems with the ones I have been using, but the fact it won't give a hint of firing with a squirt of starter fluid in the plug hole that is the strange one. This bypasses any of the suction side of the motor and usually is an indication that it has been straight fueled which I know it hasn't. If it wasn't for the fact that it is on a 600 that makes it a bit of a job to change the motor I would have just swapped it over, might get a chance to look at it tomorrow
