It's pretty basic and old school on all 550's and 380's unplug the back of the ignition ( it will now start without the key using the pull cord) remove the rubber boot from the ignition and unscrew the nut holding the ignition. Don't know why it needs replacement they pretty much never fail my 09 gtx 550 has over 12k and no problem except freezing occasionally.
SOURCE: MY SNOWMOBILE(SKI DOO TUNDRA LATE
I had a similar problem, my '89 Tundra would only run if the primer was being pumped. Turned out a piece of dirt was caught in the carb's needle valve. Check/clean your carburator. Disassemble it and blow aerosol carb cleaner through all the passages. Before removing any valves and jet screws, turn the screws in until they are first snug (while counting exactly how many turns it took to tighten them) so that when you reassemble it, you can turn them in all the way again and then back them off the right amount to get the same carb settings that you had before disassembly --- you need to count them right or it might not run nicely and could even blow a piston. This is not a hard job at all, just make sure you have something to dump the gas in that will spill out of the carb's bottom bowl.
Good luck
Osprey
SOURCE: 1982 kawasaki 550 stand up ski-doo,starving for fuel
fuel pump ? checked pop off presure in carbs?
SOURCE: I have a Ski doo 583 RAVE motor theat backfires
It sounds like you have a reed problem they should be in a "cage" just behind the carbs on the cylinder and if they were missing a piece or if they were cracked it would cause the engine to backfire. If they are in good condition they should close against the cage and stop the back pressure coming through the carbs.
SOURCE: What is the cause for the engine check light to come on, on a ace 900 ski-doo from 2014
There are issues with valves sticking on this machine. How to display ski doo fault codes on the dash
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