Well, I just told you, if it cold starts just fine, but you cant get it to idle properly its NOT your rings.
Im not saying this to have you NOT replace your rings, cause maybe yours are kinda tired and needing replaced, but Im saying this cause youll do it, and it will still have problems cause you avoided the issue in the first place.
You have an airleak, or an issue with your carb circuit. You need to fix that. It isnt your rings. It could be something as stupid as a clogged up air filter. It could be a loose coupler from the airbox to the carb. It could be a hole in the rubber tube between the airbox and the carb. It could be a clogged pilot jet. It could be a problem with your reedcage even.
What Id do if this was my quad is before I rode it and caused even more damage, Id do a compression test. That right there will tell you if you need rings. Once I did that, if I could, Id do a leak-down test. That will tell you if you have a seal in the crankcase going bad. If you do, it will create an airleak and cause problems. Id also pull the carb off, clean the outside with some brake cleaner and compressed air, and Id take it apart. Id remove the jets, clean all the passages out, etc. Id check the float level (you can search on here how to check and adjust the float level), etc. Id go through the carb. Id inspect the rubber passage from the airbox to the carb. Id check for leaks, cracking, failed clamp. Id pull the intake manifold off (the rubber thing the carb connects to on the engine side), and check THAT for any cracks, failed metal coupler etc. Id pull the reedcage out and inspect them all and make sure the petals are closing like they should. Make sure theyre not cracked.
Theres a lot you can do to it to test, that wont cost you any money. If you want to just throw money and parts at it, be my guest, its your wallet, but usually idle issues are caused stuff other than rings (again, assuming the bike starts up just fine and runs if you give it gas).
Most of the time, if your rings are shot, you cant get it to kickstart. You have to pullstart it with another quad or a car to get it to run, and it will ONLY run if you hold the throttle. It wont change, it wont surge, it just wont idle.
Your description of the issue doesnt sound like that at all. I dont think its your rings.
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