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Old 10-18-1999, 08:30 PM
Mike Cook
Posts: n/a
I have a 250C, and I would like to replace the 2 Zenith carbs with Webbers or Holly's.
I need to know what model I can use that will require as little modification as possible to
the manifold. Any input would be most helpful. Thanks, Mike
Old 10-19-1999, 08:23 PM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
At one time there was a company called "jam" engineering that offered this swap. Don't know if they are still out there.
Old 10-20-1999, 02:09 PM
Registered User
Join Date: Oct 1999
Location: Tulsa, OK USA
Posts: 139
Yes, they are available. I have a '71 250C with Webers. JAM Engineering (John Moulton) is on the West Coast, advertises in Star and gives a discount to MBCA members. Dont' have his e-mail or phone number here but I can get it to you if you like.

Holly carb's from Ford Pinto's will also work. I have never seen them myself. I understand that those Holly's were actually made by Weber - so that is probably why they can be used.

If you go w/Webers (they really are neat) make sure you get them jetted correctly or you will have a terrible time (don't ask me how I know that).

Here are the Weber jet settings you should have (both carbs are jetted the same):

Mains: Pri: 127 Sec: 130
Air Corr: Pri: 170 Sec: 175
Idle Jets: 50 and 50

No mods to the intake are required. If you get the complete kit, you will be able to use your stock air-cleaner. You can also get K&N Units (I did) that bolt directly to the Webers. Permanent filters - you just clean and re-oil (charge) them. Look and sound great.

Let me know if you need any other info.

Dan Taylor/Tulsa, OK MBCA '71 250C/'81 300TD
Old 10-20-1999, 02:12 PM
Registered User
Join Date: Oct 1999
Location: Tulsa, OK USA
Posts: 139

Sorry, forgot. The Weber models you want are the DGV models, I think either DGAV or DGEV, but the one with the electric choke (not necessarily the 'E' model) as the other one as a hot water choke (BMW used hot water).
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