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post #11 of 13 (permalink) Old 12-16-2011, 05:48 PM
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^Looks like you got it

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post #12 of 13 (permalink) Old 12-18-2011, 07:09 AM
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over 75

- A bit off topic this, but your obvious interest in the internals of Zenith carbs reminded me of a task earlier this year when I was working on the dual Bing carbs of my 1976 R75/6 BMW motorcycle. It had been laid up for a few winters and the carbs needed dismantling/refurbishing with new O rings and gaskets.

The Bing constant velocity carb is rather unusual, but generally very reliable - they are still used on snowmobiles and micro-lite aircraft.

On one carb, the main jet was seized in place, and stubbornly refused to unscrew. I tried every dodge I knew, to the point where I feared I would break the ali casting if I applied more force. Eventually I thought up a solution that worked.

I warmed up the main body using a hair-dryer, then applied a 5 second blast of 'freezer spray' to the the main jet bolt head, and quickly applied my spanner to unbolt the thing. To my intense relief, the thermal contraction had freed up the inner thread, and the jet came out undamaged. I took a few pictures to remind me of the incident.

Pic 1 - Before jet removal. carb inverted with float bowl removed.
Pic 2 - Main jet now loose.
Pics 3 & 4. Carbs finally assembled.
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post #13 of 13 (permalink) Old 01-03-2012, 09:25 PM Thread Starter
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Vehicle: 1971 250/8 sedan with 80 K miles. Driven only in Summer.
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Thanks keyhole.
Nicely done those carbs. and I certainly admire your bike. It brought back old memories. I had a BMW 250 about 56 years ago. Owned it for 2 years and it paid my fare to Canada and the train trip to Vancouver. I still miss the old girl. Have a successful New Year.
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