Vintage BMW Motorcycle Owners

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...

i share more info the engine is running good apparently, also to ears more expert than mine. Start at the first kick, idle stable, running smooth from low to higher rpm. No hesitation at full throttle. At cold start i notice little bit smoking from the left muffler, where i have the problem of foule...

Here the pictures of carb