Took the 450 out and did some awesome trail ridding and she had a little miss down in the lower RPM's but up top she ran awesome. I just picked this up and dont know a whole lot about the jetting of carbs. With a problem like this could it be I just need more octane ( I had a full tank of 91 ) of could it be I need to tweak the carb a little. Is there a set number I should be running for the fuel and air. Thanks a ton for some info.