Did leak down test today and found a leak in the base gasket. Took it apart and put on an old gasket I had just to give it a try, and it leaked too. Ordered a new set of gaskets for the top end and a new Dykes piston ring. Hope to have it back together by the end of the week, do another leak down te...

Thank you. That makes lotta sense, I’ve never really understood How the air in the crank case Works. Heading out to get hot on that leak down test. Thanks again guys

I Tried that the first time and got 45 pounds. I disassembled the top end replace the gaskets check the gap on the piston ring. This time I did not hook up the exhaust or the carburetor and got 45 pounds again. I’m having a hard time understanding how compression once the piston passes the exhaust a...

Thanks buddy going to get hot on it and hopefully find the problem. Checked all the parts and they’re all 93. Trying to understand why a compression of 45 could be anything but piston, rings, cylinder, cylinder head or cylinder head gasket. I understand the bottom and will make it go lean with a lea...

Setting up to do the leak down test now. Question on the Dykes ring the L shape is upwards is that correct. I checked ring gap today and it’s .009 of an inch. Change the cylinder head gasket and the bottom jug gasket. When ahead and did a Second compression test today and I’m still only getting 45 p...

42CF8B51-2F51-4849-84F5-F37E4D59D0E0.jpeg 67BA6889-4BFD-4420-AFDE-9B7276F70608.jpeg B8D74BA3-D399-4A78-B041-5DFBF1B3EE6A.jpeg Hey guys thanks for the input. You’re right the hole in the piston is supposed to be there and does not go through. The piston look really good as do the cylinder walls. Wit...

Here are a couple photos. Two are of the current plug. Two are the piston currently installed on the bike. And two are the piston that I took out before this one. Did a compression test and it only read 45 pounds with the current pissed installed A2518673-EC3A-4782-8FDB-E15643B54EB2.jpeg A2518673-EC...

Hi I have a 1968 Ace 100 and for the second time I have a tiny hole in the direct center of my piston right under the spark plug. I’m pretty sure I am jetted OK. Any idea why this is happening, is it because the bike was lean or is the plug too hot. Any suggestions would be greatly appreciated. Than...