I started a new thread for you and will study the infoIm in a similar boat. Ive got a 2005 polaris ATP 500ho and seems to have a weak spark to me. New cheap carb, new fuel pump, Measured 500v from the cdi out, tried a different stator / pickup with the same results (185 ohms on trigger and 0.3 on stator), different coil pack (0.2 on primary and 12k on secondary, adjusted valves to 0.006, compression is 50 on stone cold and 70 with a little oil. Swapped ECM, Is it just the low compression numbers? Factory service says 50 - 100 psi. The kicker is I do not have the original cluster but was told it ran without it but no 4x4. It has been sitting for around 4 years. Starter fluid doesnt seem to have any impact and really need some expert advice.