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I've got the spring, plug screw and valve piston to replace on the oil pump because I've noticed a gradual decrease in oil pressure on my 912ULS over the past 5 years. Will this induce air into the system requiring a purge?

Also, since I replaced my magnetic plug it has leaked a small amount of oil. I've checked torque with a calibrated torque wrench and it is correct. Though a gasket is not called for by Rotax would it be acceptable to try a thin copper gasket? Any other suggestions?

Thanks - Mike
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