300/440/550 550 Conversion Issues

My 550 conversion ski won't draw any fuel. Engine is a bored out 750sx. Rebuilt the carb, checked the lines for clogs and didn't find any. When I blow through the pulse line air comes back out through the top of the carb, so I'm thinking the reeds are bad.

Reeds don't look great but for the most part seal ok. The pistons and rings are torn up...looks like someone put in the wrong size and they were rubbing.

The engine ran fine when I first bought it, then every time I pulled the killswitch it would take 30 min to start again, now it won't start at all...Suggestions?

I don't want to drop a ton of money on parts if I don't have to, but I'm thinking I'll probably have to replace the pistons and reeds at the very least.
 
if you blow through pulse line and air comes out anywhere, there's your problem. The pulse line goes to one side of a diaghram pump and shouldn't leak air. Maybe your diaghram is shot?
 
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