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Reply to "2006 Beck Speedster - Black/Tan - 16k miles - $28,499.00"

Valve adjustment would be minor compression loss - too tight and they wouldn't close totally (but would then burn valves/seats quickly). Valve stems stretch too over time (before they break off causing severe damage).  I'd think you'd see blue smoke or hear huffing noises if more than one cylinder was below 100 psi. Hopefully, you just got a bad reading or gauge that day.  I like the gauge with a flexible screw in hose (vs just the push rubber seal - hard to use on VW due to cooling tin). Below is $27 from HF.

Pittsburgh® Automotive 62638 Compression Test Kit 8 Pc

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