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Should I re jet?

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Just bought a 2007 Yamaha grizzly. I am in Utah and I live at 4600ft. I ride mostly at 5k-8k ft. The bike I just bought was jetted for 9k ft. and it is rare that I get that high for long. It idles fine at 4600ft, my Q is should I re jet or just leave it as is? Also will it damage the engine to run it with that jetting at lower altitudes for extended amounts of time? I know running too lean or too rich can cause some series long term issues.

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I'd say if its running fine now and your not having problems then why change it. If that's not the case then I would consider 're jetting it which isn't too hard to do and im no expert so I dont know how your current jetting at a lower altitude will affect your engine in the long run.

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I would definitely rejet.  As you go higher you use smaller jets to compensate for the thinner air.  9000ft to 5000ft is a big jump.  And would probably be 2-3 sizes different between the two.   So at 5000' you are probably running a very lean fuel mixture, which is not good.  I personally would jet for 5000'.  That way as you go higher in elevation you will just get a richer mixture, which is less damaging.  Mainly fouled plugs apposed to a lean mixture which can lead to pre detonation and really do some damage.

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