I need more info make , model , engine size.
Ngk BR9ES
Clean plugs new ones maybe new points
Could be a few things. Possible to be the CDI box or the Stator.
.028"-.030"
Before buying a snowmobile, you should consider the costs and the brand and also the manufacturer.
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.
Use your spark plug wrench to adjust your rear suspension
First check compression. This can be done by putting a finger over the spark plug holes. There should be a good pop of air out of them. If you have compression and spark, next pour a little fuel in plug holes see if you can get it to try to run, if it does the fuel may not be getting through the carbs.
simple,design,it doesn't effect cylinders that are not on compression ,it allows single spark controll
120psi
go to ngk.com type your model in and they will tell you
For someone who owns a snowmobile a good insurance would be Progressive snowmobile insurance. You should probably get the bodily injury and property damage liability. progressive.com