Vintage BMW Motorcycle Owners

Yes. I pulled the valve covers and plugs and observed the piston through the spark plug hole as I wound it to OT. The piston hits TDC just as OT hits the line in the window.

So it’s not like the flywheel has slipped around at all.

therealkennyboy wrote: ↑

Wed Jun 21, 2023 12:28 pm

>Timing is perfect and plenty of spark.

Ignition timing, I assume. Have you confirmed the magneto timing is correct?

Timing is perfect. Differential timing could only be more exact if it were electronic.

However, the “compression question”.,,,

I don't know about the ratio of kicks to engine rotation. But it stands to reason that while measuring the compression a given cylinder, that cylinder will only see compression after every other 360 degree engine rotation. I don't know how it works any other way. That’s the problem. It doesn’t resu...

Seems like compression every other stroke/kick makes sense. It's a 4-cycle engine with a wasted spark ignition...intake-compression-power-exhaust. When one TDC mark comes by, it will on the end of the compression stroke for that cylinder. The next time the TDC mark comes by, that same cylinder will...

Was it was previously running with that configuration? If you have spark and compression, the only thing you haven't mentioned is fuel. Are the plugs (hopefully new) wet after a few (50!) kicks? Did you go through the carbs? Yes, previously running. Yes, carbs were completely cleaned, and the plugs...

So I am restarting a bike (R50S) which has not been run in a while, but is in excellent shape, always dry stored and the engine has always turned freely. It is equipped with a 328 degree cam. So 6 degrees more duration than stock. Valves have been adjusted. Timing is perfect and plenty of spark. How...

I’m looking at this one as well, it does not say if you are retaining 6V or not. Because you are replacing the voltage regulator it may be the case that it steps up to 12v

However Uli’s has a very helpful staff. Why not ask?

So I’ve been looking around at the various electronic ignition systems online. They all have various benefits and draw backs. One that caught me attention was the 6v system sold by Uli’s. To me it has several advantages, but a key one is it drives it’s trigger off the crank/generator rather than the...

I think they are all like this.

There were several other old BMWs going at the same time. How many buyers can there be?