Firing stronger on one side

[ststock23]

I have an older Vanguard 16 hp V twin engine. I replaced both magnetos. I’ve also replaced the diode’s on both magnetos. After running for 30 seconds I can’t touch the right side exhaust without burning myself but the left is nowhere near as hot. Any suggestions on what to look for? Thanks

 

[bertsmobile1]

Valves moving