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I rode my Yam TX650 through the Colorado Rockies, to my cousin's home at 10,250 feet. The engine felt quite soft, but with a downshift or so, it could still maintain highway speeds. You may have to run your bike on the new plugs and then read them. Look up how to do a "plug chop" as it will give you an idea of your mixture.

Also, make sure you do not have a mouse nest in your airbox. The OEM air filters are OK, but the foam in them tends to degrade and turn to bits. A Uni Filter or K&N will help there. Could be a hundred other things, but it sounds really rich.

Q: Are you a "big guy"?
 
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