Are you disabling the decompressor valve, when doing the compression test?
Either by applying suction to the vacuum tube, or removing the valve and plugging the mounting hole with an old spark plug.
Cheers,
Gadge
"ODK Mods can explain it to you, but they can't understand it for you..."
"Crazy can be medicated, ignorance can be educated - but there is no cure for stupid..."
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