Compression Tester for Flatheads with Limited Accessability
Posted: Sun Dec 04, 2022 9:41 pm
In a recent thread here on the forum a comment was made about the difficulty of attaching a compression tester to a flathead engine due to space constraints between the cylinder head and gas tank. Thought this adaptor might be of interest as it is compact (about 2.75” length) and allows easy compression tests to be performed on a KHK. I suspect it would likely have broader applicability on flathead hogs than just the KHK.
The base is a sparkplug with the porcelain knocked out. A brass pipe coupling was silver-soldered to the base and a brass street elbow and quick disconnect added to the coupling. Inside the sparkplug base a length of valve stem with internal Schrader threads was soldered in place and a Schrader valve installed. That’s about all there is too it and it works well in this application with limited space/access.
The base is a sparkplug with the porcelain knocked out. A brass pipe coupling was silver-soldered to the base and a brass street elbow and quick disconnect added to the coupling. Inside the sparkplug base a length of valve stem with internal Schrader threads was soldered in place and a Schrader valve installed. That’s about all there is too it and it works well in this application with limited space/access.