Just Moved from Arizona to SLC utah.

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The air is much thinner up there so you will notice a loss of power. I'm not too sure about running mid-grade fuel in there, so you may want to look into that. You could always go get the bike tuned :O

How many miles was the trip?

Perhaps you should check your air filter and spark plugs? basically do a tune up and see if it resolves it :O

The fuel grades in Utah are already corrected for altitude.
Here in Vegas we have 87 as the regular, in UT it is 85.
So if your bike calls for premium, use whatever octane the premium has up there

636NMP said:

i just moved up here this week an I rode my 636 up here. I have realized a significant loss of power (my wife says its all in my head) but I have to give it a bit more throttle to get up an go from a stop. Just laying into the throttle I feel the bike put two cyclinders on vacation. I understand higher altitude means less power. My dad told me to use medium grade fuel instead of premium. Is there anything I can do to get the bike to run like it did in Az. Besides move back lol would I have to have my bike tuned? Thoughts?

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Since the bike is fuel injected, there's very little you can do that it isn't already doing to adjust for altitude.

The fuel/air mix is automatically adjusted for, so that's already where it should be. Everything else is pretty much constant as far as what can be adjusted.

Dropping a tooth on the front sprocket, or going up on the back or both will get you higher in the RPM sooner, which will give you a little more snap.

If you could set up an intercooler, so the air would be colder and therefore a bit denser, it would act like it's at a lower altitude. If there is actually more air in the cylinder, the bike will add more fuel so you get more power per firing.

A turbo, or supercharger will of course give you higher pressure in the cylinder.....

I live up there (well a little bit south) I've never really felt that much of a power difference. I've had the bike dyno'd in Salt Lake, and I was making about 110hp without a tune. So it seems like the altitude isn't sapping that much power. Oh, and I run premium all the time.

zx6ixxer said:

How many miles was the trip?

Perhaps you should check your air filter and spark plugs? basically do a tune up and see if it resolves it :O

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Air filter an everything was changed the day before I left at Ridenow in Goodyear Az. The trip was about 700 plus miles.

Good to know on the fuel so I don't screw up my bike. I'm definitely going to go get it tuned. I read alittle last night about the ECU an what not. So I know that the bike already adjusted. Some place up here said to install the bazzaz fuel system. Might get a liter bike but I love the hell out of my bike, I was just used to how torquey the bike felt down there. If you live in higher altitude I'm sure you don't notice the change bc you bought the bike here an live here. But i can definitely feel the bike has lost some go go juice. I'll probably change the sprockets. Just found a job up here start on Monday. So I'll do some work to her on payday. Thanks everyone for your input.