250 Compression Test
You need a compression test gage.
-Warm the engine
-Remove both spark plugs and install the gage in place of a spark plug.
-Turn the petcock to off.
-Open the throttle ALL the way.
-Then press the starter button.
-Watch the gage until it stops rising. Compression should be 159psi or 11.2 kg/square cm or 1,100kPa for the second generation and for the first generation, 198 psi give or take 28 psi, 1,400/200 kPa, 14/2kg/cm2.
-Repeat for the other side.
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Silver '86 450
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