Vintage BMW Motorcycle Owners

Micha wrote: ↑

Fri Nov 20, 2020 3:22 am

wa1nca wrote: ↑

Thu Nov 19, 2020 1:59 pm

The solo rear end ratio for r51/3 should be 39.9 and speedo for km should be w.95 and mph 1.52 according to the chart Kurt posted

Hi Tommy,
Shouldn't it be 35:9 for a solo bike?

Yes 35:9
Tommy

Yes move the slide needle down to #3 position one hole up from the bottom hole and check that the idle jet is correct size
Note: Like any engine it is not a good to start and drive without some warmup
Tommy

schrader7032 wrote: ↑

Tue Nov 17, 2020 7:07 am

Welcome to the forum! Did you look under Knowledge Base at the top of the screen. Click on Library and search for the R5 model.

https://vintagebmw.org/library/?model=R ... ge=English
Tommy

The solo rear end ratio for r51/3 should be 39.9 and speedo for km should be w.95 and mph 1.52 according to the chart Kurt posted But if final drive gears were changed to a different ratio one should have updated the number on the final drive if not the drive would have to come apart and teeth count...

Yes the spark will take the shortest path to ground
I always insert or trim the plug wire not to exceed the bottom of the coil terminal
So the picture I posted with the coil wire inserted past the bottom of the coil terminal would make the gap less than 10mm
Tommy

Any sparking at the safety gap is not good and would certainly get worse under load and at a higher rpm It is usually caused by a bad plug wire or plug cap which you said have already been replaced? check that the gap is at least 10mm and the the plug wire on the coil is not to long coming out of t...

Any sparking at the safety gap is not good and would certainly get worse under load and at a higher rpm It is usually caused by a bad plug wire or plug cap which you said have already been replaced? check that the gap is at least 10mm and the the plug wire on the coil is not to long coming out of th...

If the hole is clear of any burs then it looks like your replacement part outside diameter is too large
Salis site has dimensions listed and states you should be able to make them from some rubber hose or stock

https://bmwclassicmotorcycles.com/index ... dlamp.html

Tommy

See that you have have power on terminal 56 on the ignition switch when light is switched on (the ground lead of you meter or test light should be connected to engine/battery/frame ground as the headlight shell itself is not grounded) or terminal 31 on the ignition switch also the ground to the bulb...

Glad to here you were able to repair the shift lever
Tommy