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Complete upgrade package to upgrade a Rotax Max Evo Junior to Rotax Max Evo Senior.
Keep in mind that when you are still replacing the cylinder, it is time to replace all o-rings and gaskets. But also check that the piston has not done too many hours. If you are not sure which piston dimension you should have, 53.96 is the most common dimension and fits in all cylinders.
Here you will find a link to the Rotax Max Repair Manual
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