We give a basic list of parts needed to build you own tester and give you a short walkthrough and how to preform the test itself. If doing compression test on 125, harbor freight sells a kit. A true cylinder leak down test is done with the piston at tdc or near it, with the crank locked
4 Stroke Leak Down Tester - HVCcycle
In a four stroke, it needs to be on the compression stroke with both valve sets closed
In a two stroke, the piston rings must be above the exhaust port
The test is done with a pair of pressure gauges tee'd into a fitting that places a restricting orifice between them Air pressure (100 psi is. The leak down tester instructions say remove all spark plugs Unfortunately it didn't do anything for me, so my intake area was free of leaks, but that's not to say my whole engine was leak free
My next step was to do a leakdown test, but buying a real deal tester seems to run around $200. I just need to go buy the stuff and try it The parts i used are as follows including the price i paid for each This in turn can result in engine overheating, piston seizure, detonation etc.
Use gauge feelers to check valve clearances on a 4 stroke, and from what i understand leak down test on 4 stroke and 2 stroke kind of different
