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Old 05-03-2012, 09:11 AM   #1
lmyamen OP
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Joined: Nov 2011
Location: Des Moines, IA
Oddometer: 347
R90/6 Carb Float setting

So we are needing to adjust the floats on the carburetors and I wanted to see if there is a specific setting or measurement to how to adjust the float correctly. Any info would great!
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Old 05-03-2012, 11:12 AM   #2
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Joined: Aug 2010
Location: Las Cruces, NM
Oddometer: 1,167
Pull a float bowl off then check the fuel level in the bowl. Look at post #13 in this thread, . Many good carb articles by Snowbum ...
ABC #12947
'75 R90S
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Old 05-03-2012, 09:55 PM   #3
Boxer Metal
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Location: Chico, California
Oddometer: 3,521
The molding line in the float should just be past parallel to the bottom of the carburetor. I do this with the carburetor off of the bike and upside down.
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Old 05-04-2012, 03:43 AM   #4
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I leave the carbs on the bike, remove float bowls, then I hold the floats up, turn the fuel back on and gently lower the bowls noting the point where fuel just begins to flow. This should be as the line on the floats is parallel with the bottom of the carb.

Main symptom of the fuel being too low is that bike refuses to go much more than 60/70 mph. When adjusting the tab that bears onto the bottom of the float needle, you want to aim to have the tab bearing straight onto the bottom of the float needle.

Hope this helps. Charles
R90s 1070 replica, R90/6, 1958 R50
1971 Commando Fastback
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