08 teryx backfires through intake
Hello i am new to this site. I have an 08 teryx with 66 hours on it. It is completely stock. Just over idle to about 1/4 throttle it backfires through the intake. I put an afr gauge on it and it goes way lean just over idle, like 20afr on rear cylinder 18afr front cylinder. So i ajusted a/f scews and can lower afr at idle but as soon as you step on it it goes way lean and backfires. So then i ajusted the valves intakes on rear cylinder were tight. I ajusted valves to speck and still having same problem. Do not know what to do next. I also checked for vacuum leaks. Any help would be greatly appreciated.