Bing Angle in Degrees

[jgp1854]

Any suggestions how to determine the proper degrees of angle on the Bing carbs.  I read in Bing's book they need to have 15* of pitch.  How is it achieved?

Thanks

jgp

[Barry]

Looking at the bike side on the carbs are pitched down by some angle possibly 15 deg but you can't or at least shouldn't attempt to adjust it much because it's determined by the cylinder head inlet spigot and by the air filter connection tubes.

What you can adjust is the angle of the carbs looking at them from the rear of the bike. Opinions vary. They should either be dead level or turned in at the top by equal amounts. The reason to turn them in a little is to achieve the smoothest routing of the throttle cables. Mine are turned in but definitely not by as much as 15 deg. If I had to guess I'd say 5 deg.

[Bob_Roller]

I personally have the carbs as close to level as I can determine by eyeballing it .

My theory is that flexible control cables are meant to be bent, floats are meant to be level, but that's just me !!!!

[montmil]

I'm most definitely with the Roller Bob on this one. I have both my R65s set up as Bob's.

Monte

[Barry]

I don't think this is remotely critical so there is no big issue here. I've run them for a couple of years dead level and a couple of years slightly (and it is very slightly) inclined. The carbs work fine either way.

I thought of adding that the carbs work leaned over in a bend but we mostly don't stay leaned over long enough for that to be a good proof they work OK inclined.

The reason I changed was that there was a debate about it on the airheads list and  Duane Ausherman commented that new bikes came out of the crate with the carbs slightly inclined. The implication being BMW set them that way at the factory.

[montmil]

... I thought of adding that the carbs work leaned over in a bend but we mostly don't stay leaned over long enough for that to be a good proof they work OK inclined.

Perhaps consider the effects of centrifugal force of the fuel in the float bowls with the bike leaned over in a turn?  

[Barry]

Perhaps consider the effects of centrifugal force of the fuel in the float bowls with the bike leaned over in a turn?  

Good point.  That should keep the fuel level when it not been sloshed about by the vibration and bumps. Sometimes I think it's a wonder carbs work so well on a bike. Perhaps it's because the main jet is thoughtfully positioned in the centre of the float chamber so that which ever way the carb tilts it always sees roughly the same fuel level.

[Julio A.]

I forgot where I got this tip, but I align the carbs with respect to the engine by using the cooling fins as a rough guide. I believe the Bings are very forgivable with regard to imprecision  that's why I never did measure them precisely.