BING on the GO

[gooddirt]

On a 36mm bing for a 1974 250 ; the needle and clip go into the slide first and then the white plastic spring retainer ?  right ?

[Steve Minor]

See of this helps...it's a pretty generic view of Bing Carbs


http://www.bingcarburetor.com/pdf/54x1.pdf

Steve Minor
Wilmington, NC

[Charles Gresham]

Yup

1974 Penton 250 Hare Scrambler
1974 Yamaha MX100
1973 Honda CL 100
1978 Suzuki RM 125
1983 Honda XL 185
1993 Yamaha RT 180

[SouthRider]

Yes - the plastic piece holds the needle in position.

I learned the hard way about 35 years ago that it can be assembled wrong........

[joe novak]

What would be the symptoms if the needle floated?  It makes sense that the bike would accelerate fine, but what happens when the slide closes and the needle might not?

[tomale]

It may not float but it would significantly change the location of the needle and it would really make the bike load up at and off idle...

Thom Green,Still crazy after all these years!
76' 250 MC5 (orginal owner)74'
250 hare scrambler (project bike)

[Steve Minor]

quote:Originally posted by joe novak

What would be the symptoms if the needle floated?  It makes sense that the bike would accelerate fine, but what happens when the slide closes and the needle might not?

Not sure I understand how the needle can "float" if the clip, plastic retainer cup and slide spring and all in the proper place. As far as performance, are you sure you have the needle clip in the proper vertical slot on the needle?

Am I missing something?

Steve Minor
Wilmington, NC

[joe novak]

I once was riding my 1972 Penton Berkshire 6-A when all of a sudden, the bike would not run above an idle.  Twist the throttle any above a high-idle throttle position, and it would "bog out" and stop running.  I was able to ride the bike home.  Well, with the little knowledge that I knew, I heard something about Moto-plat having a high speed and low speed component, and if one went bad, it would not run at that speed.  So I replaced the Moto-plat, and it still ran the same.  Further research revealed the real problem.  The carb needle broke right where the clip attaches.  Half the needle and clip was in the top of the slide, and the other was down in the jet.   Thom, thank you for the symptoms for an incorrectly installed needle.  Interesting that they are similar to that of a broken needle, too.  joe