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I'm running about 1/4-1/2 a turn off the top of my piston with 10-32 threads. With a .376 stroke and 1/2 a turn is .0156... So that makes .376/.0156 compression or 24.1/1. A quarter turn would be twice that.

So I got it to fire with the starter motor. Pops and smoke but it won't sustain running without the motor. I played with the compression and mixture quite a bit and it seemed pretty sensitive, 1/4 turn on either one seemed to be the difference between firing and not. Are there any tuning tips...

So i finished the piston and new contra. The fit is a little snug and makes some drag at TDC but is fairly free below the exhaust port. The increase in compression is significant, my little starter motor I used in the previous video can barely turn it over. If flipped to TDC you can hear it very...

Yes, very fine cross hatch though. The last piston got scratched really bad from the rougher finish so i went to about 1500 grit cross hatch on this one. Got my piston ready for parting and honing. won't make much more progress due to the holidays.

So here a photo of what it looked like after disassembly, after 280 grit valve grinding compound, and the final lap prior to lapping in the piston. Working clockwise from upper left. Not sure how well this is gonna upload but if you zoom in on the original it shows the progress pretty well.

Thanks mechanicboy! I started re-lapping my cylinder today, got down to 400 grit. Rather slow but I should finish and maybe finish the new piston tomorrow.

Ok, so I played with it some more this morning and I have fuel blowing out the exhaust when I turn the mixture out about three turns. Im not sure that it's making the compression it should. When I turn it slowly to TDC it is fairly stiff, about like a cox.049 that I have, but when I hold it...

Didn't know there was a series... thought this was the only one.

No pops or smoke. It's pulling fuel through the line and there's fuel all over the wall behind it... �� https://m.youtube.com/watch?v=OVSeduRfG54 Here's a link to a video of me trying to start it. I kinda felt like it was low on compression and when I put alittle straight two...

Finished building my engine that I started about two years ago, but it doesn't run... It's a .056 diesel and I'm not sure how much it should be making. Like how hard it is to flip over. Any help or tips would be appreciated, should I warm the engine up before trying to run it?