Valve tapping noitced valve tapping on 30 hp briggs while running after setting up @ 4months.will this go away,how to remedy ?

Question edited for clarity and make sentences.
Question moved form Cars and Trucks to make model category.

My guess is you have a leaking valve. The compressed air in the leak down test is closing it. Remove the heads and lap the valves. Check the valve stems are true and not sticking. The variation is compression 50 v 30 is too great.

https://www.google.com/search?q=Briggs+%26+Stratton+23+HP+VANGUARD.+right+side+runs+cold

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fuel supply problem
check the tap for internal corrosion, blocked hose or float stuck in the closed position
check for blocked filter in the fuel tank at the end of the hose

my thought is the valves are out of adjustment. that is the popping you hear or backfiring. i think if you take off and clean the carburetor and set the valve lash it will probably run like a new one.

Intake 003 - .005
Exhaust .005 - .007

Adjusted with the piston 1/4" past TDC of compression stroke for each cylinder.

clean all the passages i usually drain the oil and replace with diesel fuel run for 30 seconds drain and replace with oil sae30

check the air gap on the coil and resistance of the lead.

I realize you have a 10 Hp Briggs engine. The symtom your describing is often caused by the valve lash gap being to narrow on the EXHAUST valve. You may have a 0.001 gap cold but when it warms up that gap is less and you get just a bit of compression blow by but not enough to impede power output. Over time it will usually get harder and harder to start. The remedy is to reset the valve tappet gap
Depending on what engine you have the GN series the gap for intake and exhaust is 0.002 with the flywheel directly at TDC.
Standard OHV Briggs are adjusted with the flywheel 1/4 inch past TDC to a gap of .004 - .006.
The Jam nuts are torqued 65 - 85 inch lbs

Non OHV engines L-head are adjusted .004 intake and .006 Exhaust at TDC by changing valve stem length with a grinder or replacing the valve if necessary.

If you still have the problem after doing the above... replace the spark Plug... (again even if yours is new) After spark plug replacement you still have the problem respond here and I will help you until this is resolved.

This could also be a case of the fuel mixture just a tad lean..

Thanks for choosing FixYa,
Kelly

Need help I set the valves on my 13.5 Briggs and now it won't stay running unless I close off the airflow to the carburetor

could be fuel vaporising.... re rout the fuel line away from heat sources this may help or the fuel is not getting to the carby fast enough....check fuel filter and lines for cleanness .

The white smoke may have been caused by having water in the fuel, or fuel tank [due to condensation or exposure to rain and snow]. It may have been that the mower got tipped for cleaning purposes, blade inspection, etc. and oil from the low lying oil pan got into the piston.

Either way, I recommend installing a brand new spark plug and new gasoline [you can purchase a little gas siphoning hose for a dollar or so at any auto parts store] If you have gasoline left over in a can from last year it is safe to use it in your car as it mixes with lots of new gas, but not in your small mower tank as it is basically outdated fuel.