[Sethcfrider]

Hello all, I have a 2021 Cfmoto force 800 trail. And the problem I am dealing with one cylinder not firing. I have checked cam timing, compression, spark, and made sure injectors are squirting. It is only running on cylinder, cylinder 2(cylinder that is towards the front of machine). Cylinder one(cylinder towards the back of machine) has spark and strong compression. So at this point I am pretty stumped. If you have any incite on this I would really appreciate it. 

[NMKawierider]

Hello all, I have a 2021 Cfmoto force 800 trail. And the problem I am dealing with one cylinder not firing. I have checked cam timing, compression, spark, and made sure injectors are squirting. It is only running on cylinder, cylinder 2(cylinder that is towards the front of machine). Cylinder one(cylinder towards the back of machine) has spark and strong compression. So at this point I am pretty stumped. If you have any incite on this I would really appreciate it. 

If it has fuel & air, compression and spark at the right time it will detonate. Something is missing..obviously. Sometimes what's missing is only missing under certain conditions, such as spark under compression verses in open air. You can have a bad plug or low ignition voltage and get a spark in open air but not in the combustion chamber under compression. IS the battery and charging system to spec? What exactly is is the compression reading? Is the plug getting wet or is it staying dry? How did you check the valve timing?