So I got this in from a friend. A little long in the tooth and has never been serviced, but in use. Has a bogging issue so I inspected it and usually stock a carb or two for it. Threw one on for testing, dumped the fuel, and inspected everything, lines, filter, spark arrested, ports for carbon, etc. Still bogging when throttling up. So I figured I would start digging deeper and I'd best start looking for leaks but wanted to check compression first. When releasing the pressure from my compression tester, a bunch of yellow oily goo came out of the valve. It looked and smelled like oil, like regular motor oil. The plug, the cylinder, and this substance smelled nothing like gas. So I thought I'd take another run at it. Checked everything again, purged the fuel, ran it again and it bogged. So I stuck my tester hose on it again and the same thing. A yellow oil was coming out of the compression tester.
I'm wondering if something is pooled up in the crankcase. This is weird. It's not a machine that has been sitting around. It's been in use. I've seen and smelt bad fuel in machines before but this is different. Dare I classify it as a foreign substance?
However, the customer is a friend but the user is an employee of his and I haven't spoken to him. But putting something foreign in the machine would be unlike this employee. But I don't have a full chain of custody is my point. If this stuff is coming out of my tester, it's no wonder it's not running right. Any opinions are welcome. Thanks.