Midget backfiring

[Smsbarnett@cs.com]

I recently received a 1976 Midget 1500 from my uncle.  The engine was rebuilt 
about 1000 miles ago (even though it was several years ago. )  

I have a problem with the engine backfiring.  When I let off of the gas to 
shift gears it backfires through the tailpipe.  If I take the rpm up to about 
3000 and wait a few seconds before shifting it does not back fire.  Any 
suggestions?

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