Easiest way to find compression of pistons

Update: Eurocarb do not have any K1 needles at the moment - I've ordered a set of 120 main jets instead.

Chris
 
To add to Reds figures 220 psi will give you 12.5 to 1,know because Ive holed two sets of pistons,bike went like shit of a shovel though,if only for a short while  ???
 
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