Polaris 350L 2X4 two stroke no spark and have replaced basically the whole electrical system and still no fire. Can anybody please help before I pull all my hair out?

2 stroke no valves.

https://www.babbittsonline.com/oemparts/l/pol/5034200bf870023468a7390d/1998-trail-boss-w98aa25c-parts

need to replace your coil windings in are going bad has to be blue will do nothing but pop and crank with yellow fire

Hope this helps:
https://thequadconnection.com/Manuals/1985-1995%20Polaris%20Atv%20Service%20Manual%20Repair%20All%20Models.pdf

test spark plug or replace w/good new gaped correctly. gas mixed correctly and in good condition. kill switch off ? key on? fuel **** on? if spark goo can use starting fluid in carb air intake. use sparingly !!! should fire with starting fluid. they dont like cold weather to well from my experiances. if you got good compression and good fuel and spark it will start w/start fluid just use very much at a time. plug fouled i bet.

Try and check your timing?

Dead battery .,? Pull charge,.,or replace.,.go from there .,. First Try jumping it to even see if it fires if it dose then you know u need new battery...

hi seth if you remove the spark plug from the cylinder head and rest it against the side of it against the cylinder head you should be able to see if it is firing while you crank the motor. otherwise a spark plug tester can be installed in place of the spark plug

DOWNLOAD POLARIS TRAIL BOSS REPAIR MANUAL

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Polaris atv manuals

Did u choke it ? -stroke are very cold blooded Mine(2003) needs a choke after sitting 1/2 hr at 70 degrees.