Briggs & Stratton Tools & Hardware - Others - Recent Questions, Troubleshooting & Support

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..

Briggs will send you a local dealer. Check Jack's smallengine.com
Cheers.

Ps I just overhauled one.

The solenoid on carb was bad causing reduced gas to motor and low power

Motorcycles are usually fitted with a permanent magnet rotor type alternator that supplies a 3 phase alternating current to a combined rectifier/regulator, the DC output of which should be sufficient to charge the battery and supply enough current to power all the ancillary equipment. A fully charged 12 volt battery in good health has a terminal voltage of 13.2 and the output of the regulator should be in excess of that or half for six volt systems. Some motorcycle systems can be remarkably complex so it is best to use a wiring diagram to aid understanding. Motorcycle batteries won't tolerate a sustained high rate of charge so some systems provide a reduced supply until the headlamp is switched on - just one of the many possible complications that could be encountered with motorcycle electrical systems, ballasted rear lights is another...

Ring problems will do this

Yes it is probably the rings or a hole in the piston.

Check for intake leaks. restricted fuel line. air cleaner anf fuel filter.

Check batt voltage, start then disconnect batt. connect voltmeter between pos. cale and battery voltage should read 12.6 and then 13.6 when testing voltage.

The engine is not getting enough fuel. Lean burn=overhot engine.

Sounds like your valves are sticking, possibly bent w/piston damage.

Replace coil

Your choke is stuck

Sounds like the ignition coil is overheating. But make sure there is oil pressure and that there is no restrictions on the fuel line. A lean fuel mixture can also cause it to stop.

If there is a check valve in the breather it may be stuck. However this is usually indicative of broken rings or burned pistons(piston) . Compression bypasses rings and pistons causing excess crankcase pressure and oil spillage.

It will give you a bit more service. However one should also replace bearings in crank and rod. I would purchase a new 6 hp from harbor freight for $100 BUCKS.

I think you have the rocker arm clearance set wrong on the one that you worked on. See if this video will help - Lawn Mower Repair Valve Adjustment Twin

Is the choke staying on perhaps? check spark and plug check airflow, get compression test maybe the oil/compression rings giving way... sounds like its getting hot and increasing fuel flow for some reason??? perhaps clean carb with some cleaner while running (remove air cleaner) spray directly into carby while running run at full throttle as you spray it will try and die ... relax on the spraying and see how it goes.. check air cleaner for blockages as the same time :) hope you get it working!