For those asking questions about their machine, adding a signature listing the mods and miles helps other help you.
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In this thread, the miles are not known and as once warm the grizz is good to go, I figured there was less chance of a fuel restriction, and a higher probability of valve lash on the low end of the recommended range, so as the temp comes up the intake valves seal more firmly.
The deal is, to get to the valves, the carb is right there so pulling the carb to remove the bowl for a look-see is no big deal.
I don't like messing with the carb unless needed because of the throttle and choke connections on the 660, and the fact the bowl screws can be easily rounded. When I did experiment with changing jets, I replaced the Phillips screws with Allen head drive bolts for ease of removal the next time.