850 motor

cdnredneck_t3

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I'm guessing you are asking about the Patriot 850. They did some changes for MY20. They have a retaining ring on the outer race of the pto bearing, a procedure change for assembly and a new flash for the 20. There might be a few more changes but those are the ones I can remember. I believe the 19s will get the new ecm flash.
 

dezmitchell

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Search YouTube for bikeman 850 axys dyno. They have a good vid with actual #”s and dyno graphs showing the difference
 
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