All Small Six 200 rebuild.

[kaden_.adams]

Hey! Started putting my 200 back together. It had all the machine work done, and was only ran for 2 weeks, got new bearings, and it has 0.40 over pistons, all I did with the pistons was dingleball the cylinders, I think im hearing air from below the pistons, I have no oil pan on so it might just be load because of that. Any help is appreciated
View attachment 110901aa-8f9e-4c98-8bb1-c76ebe0b8751.mp4

 

[ActionYobbo]

It’s normal on slow turn to hear hissing as compression escapes past the rings.
Compression test is the only way to tell if you have a low compression cylinder.
What oil did you use for break in? What did you coat the cylinders with when assembling?