I know the older GY6 engines had a oil galley plug on top of the cylinder where the new ones don't. The performance cylinders don't have them as well. I was thinking of drilling and taping my cylinder to install a gauge. I once put a manual gauge on my origional Yerf engine and the pressure was 35 @ idle and would go as high as 55 psi at higher rpm. I was totally surprised at the pressure that tiny pump produces.
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