Search found 7151 matches

by schrader7032
Fri Nov 20, 2020 12:18 pm
Forum: Vintage (1948-1969) Motorcycles
Topic: R51/3 - 1952: Which speedometer should I order?
Replies: 11
Views: 778

Re: R51/3 - 1952: Which speedometer should I order?

I work, as a hobby, on mechanical clocks from the 1900s. They are obviously more closely designed and must be repaired precisely. It is a travesty to take one of those clocks and dunk it in something or spray with a cleaner and usually results in a clock that doesn't run. I would suggest that you no...
by schrader7032
Thu Nov 19, 2020 5:53 pm
Forum: Vintage (1948-1969) Motorcycles
Topic: R51/3 - 1952: Which speedometer should I order?
Replies: 11
Views: 778

Re: R51/3 - 1952: Which speedometer should I order?

Try counting the number of turns of the transmission output (in neutral) for exactly one turn of the rear wheel. Put a chalk mark on the rubber and turn push the bike while in gear. Probably this could also be done with the bike on center stand. Not an exact science, but you should be able to get cl...
by schrader7032
Thu Nov 19, 2020 1:15 pm
Forum: Vintage (1948-1969) Motorcycles
Topic: R51/3 - 1952: Which speedometer should I order?
Replies: 11
Views: 778

Re: R51/3 - 1952: Which speedometer should I order?

Here's a list of speedometer ratios that go with various models and final drives:

http://bmwvmca.org/joomla/index.php?opt ... &Itemid=37
by schrader7032
Wed Nov 18, 2020 1:56 pm
Forum: The Stew Pot
Topic: Hearing protection
Replies: 9
Views: 1136

Re: Hearing protection

I'm on my second set of Big Ear custom molded ear plugs. I was told when getting the second set that the ear canal changes shape over time, so custom ear plugs won't fit after a while. Maybe he was just selling me on the need for a new one. But the new one really sealed well! I also asked my audiolo...
by schrader7032
Tue Nov 17, 2020 9:26 pm
Forum: Classic (1970-25 years ago) Motorcycles
Topic: 1977 R100RS Instrument Cluster mismatch
Replies: 30
Views: 1156

Re: 1977 R100RS Instrument Cluster mismatch

Snowbum writes about pinions and gear ratios here:

https://bmwmotorcycletech.info/ringgears.htm

The speedo value of 0.691 is the metric equivalent of 1.112 and should be coupled with a final drive of 33/11 so that the speedometer readings are somewhat close to reality.
by schrader7032
Tue Nov 17, 2020 9:23 pm
Forum: Classic (1970-25 years ago) Motorcycles
Topic: 1971 R75/5 Restoration
Replies: 21
Views: 892

Re: 1971 R75/5 Restoration

Im still taking hi resolution photos but I can't post them on this site. There are any number of programs that can easily take a large photo and reduce the resolution or size. Windows has one called Paint. I suspect that Mac does as well. There are websites that will accept your photo and return to...
by schrader7032
Tue Nov 17, 2020 12:54 pm
Forum: Classic (1970-25 years ago) Motorcycles
Topic: 1977 R100RS Instrument Cluster mismatch
Replies: 30
Views: 1156

Re: 1977 R100RS Instrument Cluster mismatch

We had this discussion a few weeks back on a '77 R100RS rear master cylinder level switch. What did we learn from that? :?:
by schrader7032
Tue Nov 17, 2020 11:39 am
Forum: Classic (1970-25 years ago) Motorcycles
Topic: 1977 R100RS Instrument Cluster mismatch
Replies: 30
Views: 1156

Re: 1977 R100RS Instrument Cluster mismatch

Certainly, when the under tank master cylinder disappeared and showed up on the handlebars (front disk brake) models (1981??), there was no need for a light on the instrument pod. I can't say where the signal would have been displayed for the rear disk brake models.
by schrader7032
Tue Nov 17, 2020 10:06 am
Forum: Classic (1970-25 years ago) Motorcycles
Topic: 1977 R100RS Instrument Cluster mismatch
Replies: 30
Views: 1156

Re: 1977 R100RS Instrument Cluster mismatch

Plug your 7-digit VIN into this and see when the bike was built: http://www.bmw-z1.com/VIN/VINdecode-e.cgi My '78 R100/7 was built in September 1977, so definitely an early '78 model. I've heard that BMW likely began substituting a new harness capable of interface with the electronic tach prior to t...
by schrader7032
Tue Nov 17, 2020 7:24 am
Forum: Classic (1970-25 years ago) Motorcycles
Topic: 1977 R100RS Instrument Cluster mismatch
Replies: 30
Views: 1156

Re: 1977 R100RS Instrument Cluster mismatch

About all I got is that I agree, the '77 was a mechanical speedometer and '78 went electronic. I don't think I'd seen chrome bezels on the instruments before...maybe that's what's under the black plastic "hoods" that come on them.