I am the original owner of this 1985 R80RT. When I was a new BMW owner, the bike would often stall on freeway offramps after a long freeway-speed speed run. I would shut the throttle down to idle as I approached the stop at the bottom of the ramp and the RPMs would drop through idle and just keep dropping. Back then, the bike would instantly restart and I learned to roll the throttle down, close to idle, but not quite to keep it from stalling as I came off the freeway.
Today, after a very hot ride on the 405 freeway to work (SoCal is on fire - literally!), I rolled the throttle down to idle as I entered a very congested offramp and the engine stalled. It took a number or attempts to restart. As I got off the ramp and onto the street, I had to stop for a light and the engine stalled again, dropping through idle to a dead stop. This time I had to push the bike off the street and take a quick look as I could not crank it back to life - plenty of cranking power via the battery and starter, but the engine did not want to fire up.
I have external, clear filters and I could see that they were full of fuel. As I considered what to do next, the bike had a few minutes to sit. I tried the starter again and with some cranking, the engine fired but seemed reluctant to idle. I used my throttle lock to pin the idle at 1,100 RPM, put my gear back on and rode the remaining half mile to work with no more trouble.
I'll want to give the bike a quick once-over when I get home - providing I don't have to do it on the side of the road before I get home. Suggestions as to what to look for? Or, how to best trouble-shoot if I get stuck?
Plug wires are of indeterminate age - it has been a number of years since I replaced them.
Coil is a Dyna - I got tired of the crack-o-matic stock coils.
32mm Bing CV carbs. Been awhile since I last checked them or cleaned the jet stack.
Plugs are standard Bosch - I did not get far enough today to see if they were sparking when I could only crank the bike.
I have the Rick Jones/Emerald Island Alpha ignition with the new-style ignition module with the riveted-on heat sink - maybe a year and a half on that setup.