Vintage BMW Motorcycle Owners

Done the check right now.

Across dinamo positive and mass i measure 7 volt at idle rpm, increasing with rpm up to 10 volts. Battery seems recharging well

hello i post this topic because i had a problem with the load control lamp and during the check i asked myself how it works my bike is an R51/2, 6V electrical circuit. Enclosed the diagram. yesterday, when I push down the key i noticed that the load control lamp did not switch on. With the tester i ...

yes…i think so damn.. Who did the job the first time did not a good job.. or even did not anything.

1/2 of throttle

Here the video of muffles when the engine is warming up. I switch off soon because now i m busy with other stuff and i cannot run the bike, i don t want damage the engine getting hot.

Yes when I did the test i did it with fuel closed and the throttle fully opened. I check the carburators just to be sure, fuel paths and air paths. Nothing strange found. I riassemby them and set the mix screws as per spec ( 1 and 1/2 out from the fully in point) Later i will do again the carburatio...

Compression test done right now at cold. Right cylinder is a little bit higher but for the variability of the measurement its self i would say comparable.

What shall be the compression level?

thanks, 100% clear now. So I also need to be sure that the air passage on this screw are absolutely free and clean, otherwise it could make the carburation rich anyhow. hope also that i don't have a "Frankenstein" carburettor. I see some sections which show the same screw with o without ai...

anyhow i try to explain me the physics why, as mentioned in the bing manual, if I turned out the mix screw (20) a weaker mix is obtained, if I turn it in a richer mixture is obtained. Since this screw is in the fuel path above the idle jet, if I screw it out I should make the fuel passage bigger the...

yes I agree, changing the heat range do not solve the issue. It's important identify and address the root cause of the fouling. In the next days I hope to have some time to observe as vechoriv1373 suggested and make the other test (I should receive soon the tester for the cylinder compression, still...