My 2004 Polaris Magnum 330 won’t run, it has spark and I just recently made the spark better by cleaning the flywheel contacts. It has compression, I don’t know how much but I know it does. Finally, it does have fuel because I am spraying either straight into it, bypassing the carburetor. I can’t think of why it wouldn’t run does someone know why?

https://www.polarisatvforums.com/posts/1621383/bookmark

 

My 2004 Polaris Magnum 330 won’t run, it has spark and I just recently made the spark better by cleaning the flywheel contacts. It has compression, I don’t know how much but I know it does. Finally, it does have fuel because I am spraying either straight into it, bypassing the carburetor. I can’t think of why it wouldn’t run does someone know why?

Log in

2 things are possible that the compression is not high enough or spark is not strong enough.
A spark plug takes a lot more power to spark under compression than just testing it on the head.
I already know this from years of experience but I saw it again just the other day because my Scrambler XP1000 S was idling and started skipping and I could hear popping and I looked at it and the spark was jumping out of a small cut on the boot to the engine about a 1/2" away so that tells you that the spark will jump wherever it's easier for it to jump and think about it the spark was easier for it jump 1/2" thought the boot to the engine than jump 40 thousands of and inch at the spark plug under compression.

 

2 things are possible that the compression is not high enough or spark is not strong enough.
A spark plug takes a lot more power to spark under compression than just testing it on the head.
I already know this from years of experience but I saw it again just the other day because my Scrambler XP1000 S was idling and started skipping and I could hear popping and I looked at it and the spark was jumping out of a small cut on the boot to the engine about a 1/2" away so that tells you that the spark will jump wherever it's easier for it to jump and think about it the spark was easier for it jump 1/2" thought the boot to the engine than jump 40 thousands of and inch at the spark plug under compression.

Appreciate it, would you happen to know how to increase spark strength and/or compression strength?

 

The valves should be checked routinely (once or twice a year) as they lose clearance with use. If the clearance is zero or less, it causes hard starting issues and progressively gets worse until it will not start until the engine is warmed first.