Valve Train Technology
For Kart & Jr. Dragster Racing
If you have any questions concerning installation or proper use
of your new Go-Parts products, call us toll-free at 1-800-976-9376.
instructions are designed to help you determine the existence of
excessive pressure loss from your single cylinder small engine.
Make sure the flywheel is secured!
Leakdown Test For Briggs & Stratton 5 HP Engines
Pressurizing the piston cylinder can force the piston down VERY
quickly if the flywheel is not secured. Severe injury can occur
during leakdown tests if you do not secure the flywheel properly.
Make sure the flywheel can not turn!
Remember that your goal is a hi-performance racing engine, it is
in your best interest to follow these instructions. By not following
these simple steps, you may reduce horsepower, efficiency, and the
performance of your engine.
You can not check for pressure loss without a source of compressed
air (100 psi) or a leakdown tester. This
gauge leakdown tester
allows you to regulate the incoming supply pressure and the cylinder
pressure at the same time.
the engine to your kart frame or a sturdy bench that you can
start and run the motor on.
the engine and run at idle for about five minutes or until the
head temperature is around 200 degrees.
the blower housing and spark plug. Rotate the flywheel until
the piston is at TDC and both valves are closed, lock the flywheel
so that the engine can not turn.
Pay great attention to locking the engine at TDC. When
you pressurize the cylinder, the piston WILL move down in the
cylinder causing the exposed flywheel to rotate very quickly
in either direction if not securely fixed in position.
Personal injury can occur.
a pressurized air supply hose (from your air compressor or air
tank) to the regulator portion of the
. Open the compressed air regulator until the pressure gauge
reads 100 psi. Screw test hose into the spark plug hole of the
engine. You are now ready to pressurize the cylinder.
sure the flywheel is secure. Using the quick-connect on
the test hose, attach it to the leak down tester, this will
pressurize the cylinder. Check that your regulator gauge still
reads 100 psi and adjust if not.
the cylinder pressure from 100. This is the percentage of leakage
in your engine. A 2% leakage (98 using 100psi) is about the
best that you can expect.
leakage can usually be heard at rings, valves, gaskets, or cracks
in anything. Check your installation and condition of these
parts and correct if necessary.
you can't get the correct results, call us toll-free at 1-800-976-9376