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Broken cam 2017 Sportsman 450 HO

mxracer13

By mxracer13
in Polaris ATV Forum

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mxracer13 Apprentice

mxracer13

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Somehow the pin that holds the timing great in place broke the the camshaft. I am trying to figure out how this happened. I found a small ballbearing in the head and after trying to figure out where it goes I think mystery solved. It appears like it fits in a hole on the back side of the exhaust lobe. anyone know for sure? 

 

20210705_134835_resized_1.jpg

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mxracer13 Apprentice

mxracer13

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My guess is it came out of the hole it was in and got bounced around until it broken something. It seems like a really poor way to design it. I am guessing there was a spring behind that bearing that I haven't found yet. 

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