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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Originally Posted by Bouyhead
Installed my carb that was rebuilt by thatsmrmastsercraft, Thanks Peter!! Hot or cold this boat starts and runs like it fuel injected.