1975 BMW R90S

duaneh Wed Jul 10, 2024 12:58 am

I know many of the members here are riders, so thought I would share these pictures.
Almost a family member, I've owned this 90S since 1982. I decided to stop riding in 2017, but couldn't let go of this one. Has been parked since.

This year, I just couldn't stand it any more. I want to ride while I am still physically able.
So, I rolled it out of the garage and washed off 7 years of dust.

A new battery, of course. Then all fluids changed, new fuel lines, and new tires & tubes. Time to see if it lives. This bike has always been an easy starter. The Dell'Orto pumper carbs will prime the intakes with a few twists of the wrist. So, I wasn't surprised when it fired right up, but was surprised that the left cylinder dropped out as soon as I opened the choke. It would come back when I applied the choke.
On these carbs, the 'choke' is not a choke in the usual sense, it is an enriching circuit that independently supplies extra fuel. Evidently, all the fuel that the cylinder was getting. So that means something in the carb is plugged up. I took the bowl off and checked float operation, then inserted a wire in the jets. The accelerator pump jet was clogged with a greenish white substance, everything else seemed OK. I was doubtful that would prevent the cylinder from running, but buttoned it back up and tried again. This time, it ran perfectly. I went for a short victory celebration ride, man it felt good.

The cockpit.

**Cribbs74** Wed Jul 10, 2024 6:16 pm

Good job! Inspect those tires to be sure they haven’t dry rotted in 7yrs. Nice bike BTW

**944_Jim** Thu Jul 11, 2024 9:19 pm

Duane,
You have me beat...I have my 1965 Honda S-90 since July of '83, and my CB1100F since February '87.
I've always loved the BMS S and R boxers. I came close to trading the 1100 for a 100RT, but shook myself away...barely. I would fancy an R-bike (1000/1100) with a half-fairing these days as I don't want to rebuild a 16 valve head again.

Sweet-looking silver/grey and black paint you have!

cstatman Fri Jul 12, 2024 11:43 am

"I want to ride while I am still physically able"

I cannot stress this line enough

take the bike out. go for a spin. even a few miles. It reminds ya you ARE alive.

beautiful bike. ride it as long as ya can

rsv1cox Fri Jul 12, 2024 7:06 pm

"It reminds ya you ARE alive". Smile

Jim and I bought our S-90's about the same time, mine perhaps a couple of years earlier. I sold mine eons ago but recently bought a replacement. Rebuilt it and rode it around the yard, at 85 just to prove I could. It all came back immediately. I'll be 87 in a couple of months, I might dig it out and do it all over again. A trip to the ice cream shop might be fun.

Yabby Tue Jul 16, 2024 6:40 am

Whilst I tend to agree with you Charles, for me looking from the other side of the coin, I dont want to get smashed up just going slow. lol. simple fractures like scaphoid, fingers, etc. and I cant then enjoy flying my CL planes. My time has been, but I take my hat off to those that still ride into their later years cheers

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1975 BMW R90S

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