This is speaking from experience on my vj22, the vj21 should be similar.
The power valves should cycle either when you turn on the ignition or start the engine.
There is a grey wire by the battery, touch that against the -ive terminal and the valves should open half way. There should be some markings on the pulley at the cylinder that show when the valves are closed, %50 and open, these arent perfect but are a good indication.
When i want to be %100 sure mine are setup well i take the chambers off and feel the valve position up the exhaust port.
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