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I gave up riding a few years ago, but for a different reason. While I was still working, I would ride to work often. I had 8 motorcycles to choose from and rode a different bike every day. I also took "pleasure" rides. Some long (a week), and some short. But as I aged, I took stock of life...

I normally use synthetic, but what are your recommendations for break-in oil.
1975 R90S top end. New pistons and rings (OEM BMW).
Thx

Did you by any chance bang the output flange on the trans? If so, the "protection plate" (part number 23 12 1 230 075) could get damaged and cause gear misalignment causing 2 gears to be engaged simultaneously, which will lock it up. Could you please elaborate? This does not compute. GSPD...

Did you by any chance bang the output flange on the trans?
If so, the "protection plate" (part number 23 12 1 230 075) could get damaged and cause gear misalignment causing 2 gears to be engaged simultaneously, which will lock it up.

You didn’t mention the basics.
Check the points gap and valve clearances.
When they heat up, they close up.

Looking at the picture of the screws, someone really cranked hard on the stainless one. Look at the damage to the screwdriver slot.

Electric solenoid on the shifter with push button(s) on the throttle grip

Before you order, a couple things. Make sure your bike has clearance for larger tires Larger tires tend to slow the handling and make steering heavier. If you get wider tires with a lower aspect ratio so your overall diameter is about the same, the tire will want to lift the bike as the bike leans, ...

Diode on the back of the fuse block in the headlight is bad.

The starter is able to be engaged when either the transmission is in neutral or the clutch lever is pulled. The diode is there to prevent the power from the clutch lever switch to feed the neutral light.

Many years ago I had a similar problem (faster idle when warm) and found spigot into the head was loose causing a vacuum leak. When the engine is hot, try rotating the carb on the spigot. It shouldn’t move. Just another thing to easily check.