Severe backfire

[tonyjh63]

Question: what would be the cause if, after installing a new carb, on first crank it backfires so badly that it blows the intake gaskets? Thanks!

 

[airshot]

Check your timming, is something really out...like ignition or valve timming??

 

[tonyjh63]

Well, this is something that happened last year, and I've been curious since.

 

[Bondo]

Well, this is something that happened last year, and I've been curious since.

Ayuh,.... Have you don't any testin',..??
Set the timing,..??
What motor,..??