Is your reduction nozzle bored? If you're looking for more bottom end you'll probably want a lower pitch like 7/14 or something similar call or email impros
It would be lean only if the leak was between the intake and carbs any other leak will cause the motor to run rich crank seal base gasket ect good luck hopefully it's a easy fix
A pop off Guage will only check the psi need to open your needle and seat a leak down check is when you plug your intake and exhaust with whatever you want I use plumbing plugs from home Depot then with a pump you pump up pressure in your cases to 8 psi if your motor doesn't hold the 8 psi...
You probably have a air leak in your motor preform a leak down test if you're not able to hold around 8 psi for at least 10 minutes you need to reseal your motor I'd guess you won't pass the leak down
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