New airhead carb floast, are they pre-set?

Rapid Dog · 03-17-2011, 09:13 AM

Got mine in the box. Are they preset or should I have to fiddle about with the tangs?

Stagehand · 03-17-2011, 09:25 AM

Dont think they are pre-set, but they are always in the neighborhood. Its actually easy to check on these- just make sure that seam in the float is level with the carb body just as the the tang begins to engage the needle valve.

Cripes on the Yam XT you ned to make a separate clear tube and make sure the bike is level and then figure out 6mm below the carb seam... Makes the BMW seem no-nonsense.

supershaft · 03-17-2011, 09:35 AM

They are not preset.

They should turn the gas on and off just as the tang is level with the carb body.

Rapid Dog · 03-17-2011, 09:51 AM

Quote:

Originally Posted by supershaft

They are not preset.

They should turn the gas on and off just as the tang is level with the carb body.

...so I've heard, so I'll ask...do bothe sides need to be the same for some technical reason.
Right now my right side needed to be lower than the left for the carb to not over flow. In otherwais e I had to bend the tang open farther.

Stagehand · 03-17-2011, 10:05 AM

Quote:

Originally Posted by Rapid Dog

...so I've heard, so I'll ask...do bothe sides need to be the same for some technical reason.
Right now my right side needed to be lower than the left for the carb to not over flow. In otherwais e I had to bend the tang open farther.

That might be a float needle or needle seat issue. Both floats should be providing the same amount of gas in the bowl is whats ultimately important, and usually that means both are the same same. If one side is weird, then the floats are inconsistent, or the float valves are.

Or the overflow pipe is.

Rapid Dog · 03-17-2011, 10:17 AM

...hmmm...you mean I could have a mis-matched pair of float bowls?
I've replace nearly everything in these Bings, float needles and float hinge pins as well.

supershaft · 03-17-2011, 10:32 AM

Don't forget the bowl gasket and the float needle seat. Sometimes that is the culprit. CV Bings don't leak. At least not when they are right. Your float level should be the same in both carbs just as the manuals suggest. If your carbs are leaking, it isn't the level. It's something else.

Country Doc · 03-17-2011, 10:35 AM

They always weep a little bit around the gasket, but certainly shouldn't "overflow" unless the float needle isn't shutting off fuel flow.

Easiest way by far to check this is to remove the bowl with the carbs mounted on the bike, and turn on the gas. Set the tang for the fuel to shut off when the float seam is parallel to the carb body, as mentioned previously. You'll be able to see right away if it shuts off or not.

Let some fuel run through for a few seconds to "flush out" the needle seat.

dc

Rapid Dog · 03-17-2011, 11:03 AM

But the float needle setas aren't replaceable are they? I don't see it on the fiche...

Grider Pirate · 03-17-2011, 11:35 AM

Quote:

Originally Posted by Rapid Dog

But the float needle setas aren't replaceable are they? I don't see it on the fiche...

I'm pretty sure you're right about that. Though I've never done it, I've heard that you can recondition the seat using a bit of dowel and some grinding paste.

supershaft · 03-17-2011, 11:59 AM

They are available from Bing USA.

bmweuro · 03-17-2011, 12:04 PM

Floats are not pre set however they are normally pretty darn close. The top of the float should be parallel with the bottom of the carburetor. that is a great starting point.
Replace your float needles as well. Hone the float needle seat with a small piece of Scotch Brite wrapped around a screwdriver and a little squirt of WD40. Make sure to clean it with carburetor cleaner and a little air when you are finished.

Rapid Dog · 03-17-2011, 12:20 PM

Quote:

Originally Posted by supershaft

They are available from Bing USA.

...

Rapid Dog · 03-17-2011, 12:22 PM

Quote:

Originally Posted by bmweuro

Floats are not pre set however they are normally pretty darn close. The top of the float should be parallel with the bottom of the carburetor.

check

Quote:

Replace your float needles as well.

check

Quote:

Hone the float needle seat with a small piece of Scotch Brite wrapped around a screwdriver and a little squirt of WD40. Make sure to clean it with carburetor cleaner and a little air when you are finished.

I'll give this a try...

supershaft · 03-17-2011, 01:11 PM

Now is that the way to act towards good help?

Remember that eventually you will have to get it fixed yourself!

If the seat is leaking with a new needle. Why not try dressing it and good luck because you will need it. If the seat is working, I would leave well enough alone. Those seats are SUPER sensitive to nicks smaller than a frog's hair.

03-17-2011, 09:13 AM	#1
Rapid Dog ^OP bikes, booze, broads... Joined: Oct 2003 Location: Strangel Living West of Hell Oddometer: 8,303	New airhead carb floast, are they pre-set? Got mine in the box. Are they preset or should I have to fiddle about with the tangs? __________________ '08 R1200R / '10 WR290X/R '81 R100RS Rattlecandy Red '06 950 ADV Orangeboom '05 R12GS Wedding Bike '91 R100GSPD Derelict

03-17-2011, 09:25 AM	#2
Stagehand +/- V TDSPP Joined: Oct 2004 Location: "Poughkeepsie?!?!" Oddometer: 19,909	Dont think they are pre-set, but they are always in the neighborhood. Its actually easy to check on these- just make sure that seam in the float is level with the carb body just as the the tang begins to engage the needle valve. Cripes on the Yam XT you ned to make a separate clear tube and make sure the bike is level and then figure out 6mm below the carb seam... Makes the BMW seem no-nonsense. __________________ What to do... What to do...

03-17-2011, 10:17 AM	#6
Rapid Dog ^OP bikes, booze, broads... Joined: Oct 2003 Location: Strangel Living West of Hell Oddometer: 8,303	...hmmm...you mean I could have a mis-matched pair of float bowls? I've replace nearly everything in these Bings, float needles and float hinge pins as well. __________________ '08 R1200R / '10 WR290X/R '81 R100RS Rattlecandy Red '06 950 ADV Orangeboom '05 R12GS Wedding Bike '91 R100GSPD Derelict

03-17-2011, 10:35 AM	#8
Country Doc Wanderer Joined: Dec 2006 Location: somwhere north of Kingston, Ontario Oddometer: 2,442	They always weep a little bit around the gasket, but certainly shouldn't "overflow" unless the float needle isn't shutting off fuel flow. Easiest way by far to check this is to remove the bowl with the carbs mounted on the bike, and turn on the gas. Set the tang for the fuel to shut off when the float seam is parallel to the carb body, as mentioned previously. You'll be able to see right away if it shuts off or not. Let some fuel run through for a few seconds to "flush out" the needle seat. dc __________________ Little Bikes, Big Desert II - Death Valley 2012 Little Bikes, Big Desert - Panamint/Mojave 2010 Little DR's, Big Mountains Desert's, Sunshine, and DR's

03-17-2011, 11:03 AM	#9
Rapid Dog ^OP bikes, booze, broads... Joined: Oct 2003 Location: Strangel Living West of Hell Oddometer: 8,303	But the float needle setas aren't replaceable are they? I don't see it on the fiche... __________________ '08 R1200R / '10 WR290X/R '81 R100RS Rattlecandy Red '06 950 ADV Orangeboom '05 R12GS Wedding Bike '91 R100GSPD Derelict

03-17-2011, 09:35 AM	#3
supershaft because I can Joined: Sep 2010 Location: San Francisco Bay area Oddometer: 6,073	They are not preset. They should turn the gas on and off just as the tang is level with the carb body.

03-17-2011, 10:32 AM	#7
supershaft because I can Joined: Sep 2010 Location: San Francisco Bay area Oddometer: 6,073	Don't forget the bowl gasket and the float needle seat. Sometimes that is the culprit. CV Bings don't leak. At least not when they are right. Your float level should be the same in both carbs just as the manuals suggest. If your carbs are leaking, it isn't the level. It's something else.

03-17-2011, 11:59 AM	#11
supershaft because I can Joined: Sep 2010 Location: San Francisco Bay area Oddometer: 6,073	They are available from Bing USA.

03-17-2011, 12:04 PM	#12
bmweuro Mad Scientist Joined: Nov 2003 Location: Chico, California Oddometer: 2,965	Floats are not pre set however they are normally pretty darn close. The top of the float should be parallel with the bottom of the carburetor. that is a great starting point. Replace your float needles as well. Hone the float needle seat with a small piece of Scotch Brite wrapped around a screwdriver and a little squirt of WD40. Make sure to clean it with carburetor cleaner and a little air when you are finished. __________________ BOXER Metal BMW Biker Scum BMW Mad Scientist! VBMWMO #7770, BMW MOA #48694 & Airhead BMW Club #600

03-17-2011, 01:11 PM	#15
supershaft because I can Joined: Sep 2010 Location: San Francisco Bay area Oddometer: 6,073	Now is that the way to act towards good help? Remember that eventually you will have to get it fixed yourself! If the seat is leaking with a new needle. Why not try dressing it and good luck because you will need it. If the seat is working, I would leave well enough alone. Those seats are SUPER sensitive to nicks smaller than a frog's hair.

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