It is important that a two stroke engine is pressure tight and to check my DT175MX I made a a test rig and did some testing today. This is the test rig I made, it fits nicely in the inlet manifold where the reed valve is,
So I removed the silencer and blocked off the exhaust using the original connecting rubber from exaust to silencer, I bunged the end up using a copper piping stop end.
and then fitted the test rig into the manifold and pumped the engine and exhaust to 10 psi
And bugger...it leaks
so the only place I can test is the right hand crank seal, to test this one put the engine breather pipe in some water
No bubbles here so the leak is elsewhere, It could be on my blanked off exhaust, the exhaust manifold, cyl head or base joint, my test rig, inlet manifold or left crank seal.
All I know is it drops from 10psi to 5psi in just over 3 mins, so I'm going to have to get some leak detector spray, I suppose I could use soapy water but I have the real thing at work so abandoned the job for now....