Two steps forward one step back…
Dropped the engine in and bolted almost everything up. Had to leave the PV cover off the right side because I managed to lose both the new clips I bought between my mailing address and home and the head just came back from Slavens. Bolted the head on and took a compression reading of 180psi, up from 140 with the old head and the wrong base gasket.
So with the engine sitting in the frame it occurred to me that I should do a leak-down test. That’s when the fun started. It wouldn’t hold 6psi for 6 seconds, so out came the soap spray. Leaking base gasket, so I pulled the engine out and removed the jug for a light coating of case sealer on each side of the .002” thick gasket and again the engine was pressurized.
Still leaking fast, this time from the exhaust gasket, so again case sealer was used. Pressurized it again and it started leaking from the factory welds on the exhaust flange. At least 1/3 of the weld didn’t penetrate between the two
parts, so I removed the flange and stuffed the plug into the port and pumped it up again. Still leaking!!! But where???
I ended up soaking the entire engine and couldn’t get a bubble out of it even though it was bleeding off 5psi per minute. Couldn’t hear anything either, so I uncovered the left side crank seal. No leak there so I removed the right side covers to check the other side of the crank, no leak there either, but wait! No more pressure bleeding either!
It held 6psi for 10 minutes, wtf???
I turned the crank slowly and tried to get it to leak, but it didn’t, so I decided to put the covers back on. The whole time the engine is holding pressure, when I went to press the PV rod on I hear a sharp “pssssst” and the gauge dropped to zero. I screwed with it for 20 minutes and could get it to stop leaking with a light touch of a finger, but I couldn’t get bubbles to form. I’ll live with it.
Color scheme is going to be very un-KTM, pics and fire up next week.