1983 BMW R100

[NICHOLAS STOKES]

Great news Eric.

Last Thursday we set the valves and after swapping out the faulty diode board (bad diode),  got about 13.5v at 3K RPM with both the mechanical and an electronic regulator, we found no fire on the RH cylinder when trying to do a carb synch.  Swapping wires, plugs and coils and a shot of brake-kleen in the intake did not result in any fire.  Running out of time and hoping to avoid rush hour traffic stopped us at the point of removing the carb.  We did put anti-seize on the exhaust nuts which were thankfully not seized and lubed the throttle grip which was pretty well gummed up.

There is a need to get some solid mounts for the diode board for better grounding and to replace a broken rubber mount.  I will return in about a week with my carb stick, compression tester and timing light to get it tuned up along with a grease gun for the swing arm bushings.  For future work we may want to look to a day at my shop for a clutch spline lube, and possible tire change.  A mini tech-day sounds like fun.

Nick Stokes
Yorktown

> On Oct 11, 2020, at 9:36 AM, Zwicky, Eric <ezwicky2 at gmail.com> wrote:
> 
> Hey all, Yesterday afternoon I gave Mike a set of O-rings
> I had extra.    He's going to drop the bowl on the right carb and replace the O-rings on the idle jet, idle-mixture screw, and the main jet stack, and spray everything thoroughly with carb cleaner.
> 
> If that doesn't solve the problem, I'll help him take apart the rest of the carb and clean it, as well as replace the throttle-shaft and enrichener O-rings, and whatever else needs attention.
> 
> BTW when I got to his garage on Friday to take a look, the bike had fire on the (externally-grounded) right plug, and we could see gas getting to the carb (clear fuel line).   But it would only run on the left cylinder, us deducing this by feeling the puffs of cold air from the right exhaust.    But with the enrichener engaged, the bike would actually fire on that side, albeit roughly, which pointed us to the carb as the culprit.
> 
> Mike's a bit daunted at the prospect of completely disassembling the carb(s), so he wants to do this less-invasive cleaning / restoration first.  My time is more limited, so he's going to try this first and then if needed I'll help him with complete disassembly and rebuilding.
> 
> Eric Zwicky
> Richmond
> 
> 
> 
> On 10/11/2020 2:11 AM, Charlie Smith wrote:
>> Mike,
>>   A good cleaning and a few new parts are WAY Cheaper than a new (or even used ) set of carbs!! Let's see what the folks on the list have to say.
>> Charlie #13
>> ----- Original Message -----
>> From: Mike Slavin <mkslvn5 at gmail.com>
>> To: Charlie Smith <bmwcharlie at embarqmail.com>
>> Sent: Sat, 10 Oct 2020 14:40:43 -0400 (EDT)
>> Subject: Re: 1983 BMW R100
>> Charlie,
>> I didn’t think about this possibility when I sent the last email to you, but it might be cheaper and easier just to buy a set of bing 40 carburetors in good condition.
>> What are your thoughts?
>> Mike
>> Sent from my iPhone
>>> On Oct 10, 2020, at 2:20 PM, Mike Slavin <mkslvn5 at gmail.com> wrote:
>>> 
>>> Charlie
>>> The new diode board solved my electrical problem. Yah! Unfortunately, the right cylinder is not running. I have spark and I think compression (I can feel air coming out of the spark plug hole). By taking the float baowls off I can tell that there is a lot of trash in the carburetors. I know I need to get my carburetors cleaned and possibly rebuilt. I don’t think I will need the full rebuild, but certainly diaphragms and some O-rings and some gaskets. Is there somebody affordable that I could send the carbs too for a clean/rebuild? Please let me know what you think. All the guys that you put me in touch with have been incredibly helpful and nice. The sense of community and fellowship is amazing. Thanks again for all of your help!
>>> Mike
>>> 804-405-9535
>>> 
>>> 
>>> Sent from my iPhone