Bing 54 slide differences

[Scott Sappington]

I have a few Bing 54 throttle slides. My early 74 HS has no choke only a tickler.
Question: On the side of the slide facing the engine, some have a notch machined out, some don't? What's the difference and any problems using one with the notch?
Also, if the choke is not used, can you use that style slide and just leave the choke slide mechanism in place or....? Thanks,
 Scott "Rat" Sappington

[454MRW]

Scott, I'm not sure about the notch without actually looking at a carburetor, but you cannot leave the choke slide mechanism in the carburetor if you're not using it because it will be in the closed position held down by the spring and the engine will not run. You can leave the choke mechanism out as long as you plug the hole in the carburetor top or change to a top without a choke cable provision. Mike

Michael R. Winter
I enjoy rebuilding and appreciating Pentons!
1974 250 HS Pentons-1978-1979 MX-6 175 & 250 KTM's
1976-78 125-400 RM's & 79 PE250 Suzuki & 2012 DR650
2007 CR125R Honda
1977 MC250 Maico

[Daniel P. McEntee]

If the notch is about 1mm deep and 2mm wide, this was done to help an engine coming up off idle and running on the bottom end of the power band. I think this was a common practice back in the day on Zuendap, small bore Sachs and others. I tried it on my 250 Hercules and it helped out on the bottom end. Just lets a little bit more air in to help prevent loading up.
   Type at you later,
     Dan McEntee