Summer Camp Engine Update

[smudvapor]

I would double check the firing order

It's good.

[jerseybigfoot]

Good compression in both cylinders, good spark, good fuel, timing checked. I don't get it.

I would double check the firing order

[smudvapor]

All joking aside Smud, I wish you quick success in finding the problem. I hope your new parts are not damaged.

Good compression in both cylinders, good spark, good fuel, timing checked. I don't get it.

[philipatmaxfour]

Must be something. I put a new cylinder, piston, rings in and it still won't start.

All joking aside Smud, I wish you quick success in finding the problem. I hope your new parts are not damaged.

[smudvapor]

must be those Gremlins
https://www.youtube.com/watch?v=dar2HKImK-0

Must be something. I put a new cylinder, piston, rings in and it still won't start.

[jerseybigfoot]

must be those Gremlins

https://www.youtube.com/watch?v=dar2HKImK-0

[philipatmaxfour]

summer camp engine update

the fact that the grooves are not parallel to the piston travel tells me that something with some size to it was floppin' around in a port and hitting the skirt. a piece looks to have dropped into the the bottom end and back up the side by the wrist pin

[smudvapor]

The second image is very perplexing! How did whatever was in there "walk" one way or the other and not drop to the bottom! And still not be found! Image one seems to show that whatever it was went from top down through the rings...but how it jumped 90 degrees to other position and not score the rings? Was engine running when you got it? Or was it DOA from the start? Maybe previous owner did something dumb?

NO, I completely rebuilt it and drove it in a machine three years ago. It has spent the last couple of years sitting in my garage on a shelf waiting to be used in something else. It ran fine.

[hipowerone]

The second image is very perplexing! How did whatever was in there "walk" one way or the other and not drop to the bottom! And still not be found! Image one seems to show that whatever it was went from top down through the rings...but how it jumped 90 degrees to other position and not score the rings? Was engine running when you got it? Or was it DOA from the start? Maybe previous owner did something dumb?

[smudvapor]

Did the engine run when you acquired the machine?

Yes, I rebuilt it three years ago and ran it all summer. It was then removed and put on the shelf in the basement until now.

[Nubs]

the fact that the grooves are not parallel to the piston travel tells me that something with some size to it was floppin' around in a port and hitting the skirt. a piece looks to have dropped into the the bottom end and back up the side by the wrist pin.

[Nubs]

Looks to me like something got sucked into one of ports, piece of the baffle from the exhaust? what side was the damage on

[ARGOJIM]

Plugs were good.

Did the engine run when you acquired the machine?

[smudvapor]

A possibility, burnt off or broken electrode.

Plugs were good.

[smudvapor]

Did you happen to look in the exhaust pipe for the piece?

Nothing in there either. Must have come out after the damage was done.