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Difference between stock and Hot cams

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I bought this bike from a guys who said it has an aftermarket cam in it. When I checked the valves the other day, I was looking to see if he was telling the truth. Is there a way to tell by looking at it if it is stock or not? Also, one exhaust valve was out of spec (too wide of gap). Can any brand shims work or if I do have a Hot cam, do I need to use their shims?

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You can use any brand of shims of the right size (diameter). Don't know how to tell stock from non-stock, sorry.

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hotcams are black with stenciling on the end of the cam...did the person specifically say that it was a hotcam?

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on the end away from the sprocket opposite the lobe. If he didnt say Hotcam, it could just be a stock regrind and you wont be able to tell unless you pull it out...

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They can make a big difference, what kind depends on the cam grind.

And it's easy to tell a Hotcam from stock, the stock is all silver colored and the hotcam is black(the tips of the lobes will wear to silver over time).

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