Kawi2strokes.com Forum

Just finished rebuild 74H1. Does anyone know of a site that sells a leak down tester or kit, or something similar? Thanks, Robert

A couple of different methods from mraxl's resources page :

http://kawtriple.com/mraxl/cranksealtest/cranksealtest.htm

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"Only cheat the cheaters, boy - you can't cheat an honest man!" Mordecai Jones - The Flim Flam Man.

A "leak down tester" tests rings in bores, and also valves in 4 striker engines.

A pressure/vacuum tester checks sealing, both directions, in to stroke engines.

Do you need a leak down tester to test rings, or a pressure/vacuum tester to check full engine sealing?

a LEAK DOWN TESTER FOR COMPLETE ENGINE SEAL. HAVE BEEN HAVING RICHNESS ISSUES. COOMPLETE REBUILD OF 74H1. hAVE TRIED EVERYTHING IT SEEMS. i HAVE A USED SET OF CARBS IN NICE SHAPE, I MAY TRY THEM NEXT. IVAN'S PERFORMANCE JET KIT COMES HIGHLY RECOMENDED, FOR A LAST RESORT. i JUST THOUGHT VIA ANOTHER POST OF A LEAK MAYBE SOMEWHERE, BUT, TO MY UNDERSTANDING THAT LEADS TO A LEAN MIXTURE NOT RICH. SO MUCH FOR MY STORY. I SAW A MOTION PRO SET, THEY WANT TOO MUCH MONEY AND ONLY HAS A SET UP FOR A SINGLE CYLINDER OR DUAL, NOT A TRIPLE. I'M THING WITH A NEW SET UP THAT IS CLOSED TO RUNNIBG REALLY WELL, AN AIR IS PROBABLY THE SMALLEST POSSIBILITY. tHANKS FOR LETTING ME RAMBLE. ROBERT

Respectfully, there is no such thing as a "LEAK DOWN TESTER FOR COMPLETE ENGINE SEAL".

As said, a leak down tester fits into the spark plug, has a metered amount of air pressure, and while the piston is held at TDC, the amount of air leakage past the ring/piston/cylinder seal is measured on a gauge.

Also as said, a PRESSURE/VACUUM TESTER IS a tester that checks the entire cylinder/case seal in both directions, pressure for inner seal lip leaks, vacuum for outer seal lip leakage, along with gaskets, other crankcase/cylinder sealing issues.

You are speaking of the pressure/vacuum tester, and it is vastly different from a compression seal leak down tester, wo very different tools, with completely different applications.

As far as the pressure/vacuum tester goes, not so expensive if you use regular auto part stores and hardware store pieces. You will also need a bulb to make pressure, as both tests only use 6 PSI and 6 in/hg (vacuum) to perform the tests. Auto part stores supply the rubber adjustable freeze plugs for all 3 exhausts, 3 soft plugs the size of the inlet manifolds for H1 engines, a hose fitting for use in either one soft plug or modified spark plug body, hardware store can supply 3 no hub connectors and clamps for those soft plugs, to hold them in place on the inlet manifolds. Add a pressure/vacuum gauge that reads low scale, under 20, a hand operated vacuum bulb, and hose, and he pressure/vacuum tester will work on all 3 cylinders at once, with open labyrinth seals. this checks all 3 cylinders at one test each way.

With a closed seal engine, such as those rubber seals that have positive pressure lips to the crankshaft, this test would be for one cylinder at a time.

The "6 and 6" refers to the specification that both pressure, AND vacuum be held in the engine at 6 psi for pressure, 6 in/hg vacuum, for 6 full minutes, NO CHANGE.