If you backfired through the carb, you have most likely blown your power valve- unless you have done the update. Pull the bowl, remove the power valve and check it out. Then check the routing of your plug wires. If they all go to the correct holes in the proper order, check the timing. Hopefully on of those issues and not a flat cam.
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ONE PACKAGE AVAILABLE AT THIS PRICE
5 14X5.5 T06 WHEELS W/GUNMETAL INLAY
5 ST215/75R14 KENDA LOADSTAR KR03 RADIALS
STAINLESS CENTER CAPS, LIFETIME CHROME LUGS
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SNOWMOBILE TRAILER TIRES & WHEELS
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LED lights, Chrome & Powder Coated Lugs