BMW Motometer instruments...the R45, R80ST,R65 and R65LS.... this is likely my last posting for Motometer instruments, perhaps one more for BMW with VDO instruments to come....

I've featured Motometer and their instruments used on BMW motorcycles to date....see over to the RHS in the search area and type in Motometer for these previous posts......

This post will be my last on BMW with Motometer instruments and I'll do one more in the future on the so called "Earles Forked" BMW with VDO instruments. So this post features the R45, R65 and R65LS instruments which were 100mm diameter nominal with a black anodised bezel rim rolled in place to seal the instruments.

The speedometer generally had the trip reset up into the glass of the speedo with a small rubber boot trapped in place by a capped plastic sleeve with a thread and nut.....funnily I never measured this.
some early ones had the reset at the back of the instrument and used a plain glass...this was a better arrangement as the small rubber boot over the reset eventually splits and lets water into the speedometer.
Internally most metal parts are unplated and so rust.....
The tachometer was electronic and used the same movement as the BMW/7 series although the circuit board differed in that it was round, nominally about 100mm in diameter, external and secured by a plastic cover held in place by three PK type screws.

 

Despite the note on the photo from a BMW catalogue above..the binnacle is the same for the R45, and R65 variants.

The speedometer was in 120mph or 200kph dial scales, but 180kph for the R45 and the rear final drive ratio dictated the calibration factor which is displayed on the dial face as w=xxxx.

There were special 85mph dials made for the US market during the Reagan era oil crisis knee jerk reaction when all new cars and motorcycles had to have only an 85mph speedometer...the thought was you'd drive slower and save fuel....

 Speedometer exploded drawing....

Electronic tachometer exploded view....

 Trip reset exploded view....

BMW R65LS....

View of R65 and R65LS instrument cluster.

The calibration factor is w=773.

This means the speedometer cable rotates 773 times for every kilometer travelled.

So if the cable rotates at 773 times per minute, the speedometer will read 60kph.

So if you use a tester, the speedo of the input cable is 773tpminute to show 60kph on the dial face...

Below are some notes from my days in business and photos, used elsewhere in other Motometer posts by me, but relevant to these instruments...