Topic: When these bikes left the factory

[gregk]

When these bikes left the factory, were they set up to run at any specific elevation or was this the responsibility of the dealer? 
I stopped at Red's Country Store to talk to Bill who knows alot about bikes and as I was having some problem with my 400F, he suggested that maybe I need a smaller jet to compensate for the high elevation ( Rocky Mountains). 
I have never given this much thought and would elevation change make that much difference to an owner tuned bike?

Greg

[TwoTired]

Does your bike still have all its stock components?

What is your elevation?

What are your problems?

Dealers handled issues related to elevation.  It's a bit tricky.  Particularly when the bike is then operated at sea level.

[gregk]

To the best of my knowledge, the bike (400F) has all stock components.

The elevation here is 3660 ft. 

The bike seems to run rich.  sooty pugs, no power, poor mileage.

[TwoTired]

How old is your air filter?

[Bodi]

Sounds like altitude might be an issue. However - if this bike has always been there, a PO would probably have complained and had it fixed... so possibly (probably?) this is a new problem. I would clean the carbs, especially the main jet emulsion tubes, and see what happens. The emulsion tubes  provide the needle orifice with an air/fuel foam so if they are plugged you get just liquid fuel - giving a rich mixture.

[medic09]

I dunno....3660 seems pretty low to me...

[gregk]

Air filter is new.

Bike began life in a different area at probably a lower altitude.

Greg

[TwoTired]

3660 is not a very high altitude.  5-7K ft would be more of a concern.

If your air screw setting is stock, I would open it up some and see if that helps.  As Bodi said, there are bits in the carbs that can fudge up and richen the mix.

If you are going to change jetting, and needle settings, you'll have to get inside them anyway.

Are you using resistor plugs?  What numbers are they?  Do they have an R in the number?  Perhaps your spark is less than it should be?