Many things can cause a snowmobile engine to back fire. Ignition coils ( spark plugs, coils) or water in fuel. Check these and maybe it will solve your problems.
unburned fuel in the exhaust ignites
Unburned fuel in the exhaust system causes the backfire from the exhaust pipe.
I think you are hearing pressure pops. Not a backfire.
a backfire is caused by incorrect timing or not enough back pressure in the exhaust pipe
It's lean.
Yes, a backfire can potentially damage your snowmobile. It often indicates an issue with the fuel-air mixture, ignition timing, or exhaust system, which can lead to further complications if not addressed. Repeated backfiring can harm engine components, exhaust valves, or the spark plugs. It's advisable to diagnose and fix the underlying cause to prevent long-term damage.
It's lean.
Backfire is normally caused by engine out of time, or spark plug wires installed incorrectly.
Your car is running too rich.
bad gas
Too much PSI.
Out of time.