A guy in our club had one with probably hundreds of hours on it. Absolutely no compression, took a starter 20 seconds of spinning to get it to fire. He would fly it till it ran out of fuel, and it would feather down to nothing over a long time. You really could not feel any bump at all. It was cowled, and likely ran very hot, as it was black. He flew it a lot for years. Good strong runner too, only slightly less than a schnuerle. The bearings should come out easy with a bit of heat, as it has a removable front. If you think it is needed.