Float Height in Colorado?

[Guest]

So the last two early 80's GS liter bikes I've bought here in Denver had the float heights set way high, 26-27mm from gasket surface to flat on float.
The bowls were carrying very little fuel in them.
During the carb rebuilds I set them back to the 22-23mm range and the bikes run awesome.
Any idea why shops would set them so lean for Colorado? Personally I've seen no effect on performance of a CV carb in Denver, above 8,000', yes, you can feel it.
I'm just curious...

[Tom R]

Measuring to the correct spot?D4F202AB-D2F9-47AE-A701-FDD8E060A0D1.jpg

[Guest]

Measuring to the correct spot?[ATTACH=CONFIG]60415[/ATTACH]

Yes.(gasket surface to flat on the float, per the service manual) That's why I was curious to see if anyone would have a reason that they were set so high. The bikes I bought were from guys who didn't do their own maintenance, so I'm assuming it was the shops they took them to.

[Steve]

Hey, I recognize those fingers.

Usually, a shop will use the wrong place to measure, which results in the float being wrong in the other direction. Setting the tops to the 22.4 ? 1.0 specification will yield about 18 or 19 at the correct location. That will yield a higher fuel level in the bowl, making it richer, which is NOT what you need at your elevation.

By the way, with your CV-type carbs, you don't need to worry too much about re-jetting for elevation.

.

[steve murdoch]

Some more info on the CV carbs not being bothered by elevation changes.

https://www.motorcycleproject.com/text/carbs_altitude.html