Vintage BMW Motorcycle Owners

Short update: I now had the opportunity to access the carb lying in vinegar. Lucky I did so, I planned to let it lie there another day. It turns out that the vinegar attacks the alloy of the carb's body. I immediately took it out, rinsed well and scrubbed with a toothbrush. Tomorrow I'll take it to ...

Morning Todd, First, many thanks to you and all the rest here, willing to help with lots of good will. I'm located in Israel. The first original carbs where unrepairable. I tryed it with them but gave up finaly. I re-bored them and tried all kind of other stuff until I realized that they should go. ...

Came back to update:
Took the carb out from the tank and installed it back on the bike.
Opened fuel tap and still leaking.
Swapped the head assembly with the other side with no change.
Took the complete carb off and put it into a vinegar bath for 48 hr, will come back for update.

Thanks. They went both back into the solution. Will see them on monday and update.

Another update: I took both left & right carbs cover's off. The problematic leaking carb has the lower plunger (arrow) stuck alternately, and when I try to blow air with my mouth into the bronze fuel hose stud (arrow) - I can't go through. The lower stuck plunger can be pulled out when I gently use ...

Slightly embarrassing phenomenon: when I pull the key out of its place in the headlamp, the engine continues to work. The magneto kill wire goes from its pole on the magneto to pole # 2 in the headlight's ignition switch plate. As far as I know, this is the right connection. The key itself activates...

Updates: The float is water tight. No bubbles. Bot rods sides are entering/going through the right spots. The float can be pushed down in the chamber, against the fuel level and it is popping back up when finger removed. When cleaning the carbs, one of the process was filling up that chamber with vi...

Well it is floating insie the carbs. chamber and I can not hear fluid inside.
But, that rod that is going through the float can be swiveled. Is this ok? I mean if it is turning inside the float, how can the last one be air tight?

Hi Kurt,
Yes they are brass.
How can I check sinking?

The carbs where bought new from Mark Huggett and where installed as is, no calibration was needed. The bike was a first kick started back then and pulled very well. Then I let it stand for 4-5 years and now preparing it back for ride again. Overhauled the engine and gearbox. Regarding the carbs: Too...