I have a 1993 Polaris 350L 4x4. It has been running great. Well 2 days I jumped on it and it started right up. I rode it to the front and the gas was low so i filled it up and as I was hooking up a trailer to bring things to our dumpster it started running rough and then stalled. I was able to get it started again and rode it with the trailer towards my driveway and then it stalled again and will not start again. I thought maybe it was bad gas but I had also filled up my ride on lawnmower from the same gas can and that is running fine.

Today I decided to get it running and it will not start but turns over easily. I put a compression tester on it and I only get about 70 psi. I do not think that is enough but its been running great for the last few months? Do ATVs just lose compression while they are running?

 

Is 1993 a 2 cycle? Needing oil and gas mix?

I would imagine it could always break a ring or stick a valve to loose compression.

 

We have the information you seek on the ATV Connection homepage, here:

https://atvconnection.com/articles/a...pression-loss/