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Old 10-05-2012, 09:09 AM   #1
backfill OP
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Location: Ancaster, Ontario
Oddometer: 59
New Guy with R100R

I am new here. A while ago, I bought a 1992 R100R with 46,000 miles that had been sitting for about 6 years. It came with BMW hard bags, a sargent seat as well as the stock seat, a S-type fairing with the low and a higher screen, low bars, and fork springs. I am assuming that the extra springs are the stock ones and that the ones in the forks have been replaced, but I am not sure how to tell. It also has two front disks, braided steel lines and heated grips which still work, front and rear fender extenders and fork leg covers. Although i have no history for the bike, i appears to have been well maintained.

It is in good condition with the original Amethyst (which everyone but BMW calls purple) paint with pin striping. Since it is an air cooled, two valve, push rod dinosaur, I am calling it Barney. When I brought it home, the first words out of my wife's mouth were "you are going to paint it aren't you?" The colour is growing on me.

The down side is that the VIN was changed by the State of Maryland. Google is my friend so i found out that the VIN was changed if the bike was rebuilt after an accident or was a theft recovery. I have had this bike apart and see no evidence of an accident; the paint code on the frame matches the tank and side cover colour and the ignition key fits the steering lock, seat lock and bags. Given this, I think it was a theft recovery.

It is now running and on the road. I replaced fluids, battery, tires and cleaned the carbs, adjusted the valves, gave it a good cleaning and fired it up. It is still hard to start, but syncing the carbs should help. It is so much fun to ride that i feel guilty because I am not riding my other bikes.

I was working on it last winter, but ran out of time before spring. So although I changed the oil in the rear end, i have not lubed the drive train. Given that everything else appears to have been done, i was not too worried about it. But it is on my to do list for this winter.

The BMW dealer gave me the wrong crush washers for the engine, transmission and rear end drain plugs, so it is dripping a bit. The washer diameter is too large. I bought some copper washers from an automotive store, but i have not tried them yet. The seals at the bottom of the push rods are leaking a little bit, so that is something i will have to deal with in the future.

I love looking a the photos of the other airheads on this forum, so i have posted some of Barney. It is overcast here today, but I will post better photos when i have time. I am looking forward to participating in the discussions about airheads.

cheers,
Phil








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Old 10-05-2012, 09:31 AM   #2
Biebs
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Laugh Nice!!

Very good looking bike - but and there is always a butt the valve covers are from an older bike not the right covers for a 92. Someone else will chime in on this just pointing it out. May have been replaced - accident serial # change
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Old 10-05-2012, 09:36 AM   #3
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valve covers are correct......nice bike you got there....
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Old 10-05-2012, 10:58 AM   #4
disston
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Yeah, at some point in the '90s the peanut valve covers were used as a selling point maybe. It was only certain models.

I'm not sure about this but that drive shaft might be the one that runs dry, no oil. You should have or you can buy a Clymers or Haynes manual.

If the push rod tube rubbers are just barely wet and get dust sticking to them but they are really not leaking very much leave them be. It's an awful lot of work to fix something that doesn't need to be fixed unless they are really, really leaking.

Sounds like somebody changed the fork springs.

I think it's a weird color but I've seen worse. They had another color that was chartreuse. Be thankful you didn't get that one.

My bike is black. The way they should all be.

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Old 10-05-2012, 11:29 AM   #5
Rapid Dog
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Old 10-05-2012, 01:08 PM   #6
squish
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[QUOTE=disston;19754802]I think it's a weird color but I've seen worse. They had another color that was chartreuse. Be thankful you didn't get that one.
QUOTE]

Really I don't remeber a high viz-ish yellow green BMW

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Old 10-05-2012, 02:53 PM   #7
Bluethumb
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Pushrods seals leaking

BMW sells a tool for seating the pushrods seals, but you can make one easily. Buy a length of stout PVC tubing or better a length of metal tubing about 12-18 inches long. Buy a diameter that is a little larger diameter then the pushrod tube. If you look around a good hardware store, you'll easily find an appropriate piece of tubing. Slice away half of the tubing about 4-6 inches up the length of one end, forming a long scoop, if that makes sense. This allows you to place this "scooped" end against the rubber seal and use a rubber mallet to lightly tap the other end, hoping seating the seals. If you're lucky, re-seating the seals will stop the leaks. If not, you'll still have the tool you need to seat the new ones when you replace them.

I hope I've described it well enough so you can make one. Maybe someone has a picture they can post.

Beautiful bike. The R100R is an awesome airhead. All of the simplicity of an airhead. All of the latest technology and updates - tubeless tires, oil cooler, paralever, double disc brakes. But none of the headaches of the paralever GS's. Congratulations, you've got a great bike! I'm jealous.
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Old 10-05-2012, 04:17 PM   #8
red bud
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yea, the color grows on ya, i call it easter egg color
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Old 10-05-2012, 05:27 PM   #9
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I've never done it but I've heard it said that some owners have wrapped a few turns of thin wire at the top end of the pushrod seal...at the mating point of the top of the rubber with the steel collar on the pushrod tube. By jamming that wire in, you gain (theoretically) additional sealing pressure at the engine case. Can't hurt to try it as a way to put off doing the seal replacement job.
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Old 10-05-2012, 05:42 PM   #10
Jamie
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That's a great looking scoot!
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Old 10-05-2012, 05:54 PM   #11
disston
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[QUOTE=squish;19755771]
Quote:
Originally Posted by disston View Post
I think it's a weird color but I've seen worse. They had another color that was chartreuse. Be thankful you didn't get that one.
QUOTE]

Really I don't remeber a high viz-ish yellow green BMW

I got the color wrong? There was a really weird bike color that was sort of pinkish? We have one here in Maryland I hate to tell you he's one of my best friends in the club.

I think the purple one that belongs to Backfill is growing on me. I might get used to that one. Why don't you park it in front of my house, I'll let you take the R90 home.
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Old 10-05-2012, 06:02 PM   #12
R100RT Mark
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Quote:
Originally Posted by backfill View Post

I am new here.....

It also has two front disks.....

It is now running and on the road. I replaced fluids, battery, tires and cleaned the carbs, adjusted the valves, gave it a good cleaning and fired it up. It is still hard to start, but syncing the carbs should help.....

The BMW dealer gave me the wrong crush washers for the engine, transmission and rear end drain plugs, so it is dripping a bit......

Phil
Phil,

Nice. My daily rider is a 1993 R100R.

The 1992 R100R had a single front disk as standard. Twins discs may have been an option (memory going), but they are certainly a common upgrade.

Not sure what you mean by “drive train”. Unlike the monolever bikes, the drive shaft on the paralever bikes like the R100R does run “dry”. The transmission/gearbox and final drive are “wet”. Do not put off changing these oils. Condensation/water ingress into the transmission is not unusual and running an emulsified oil can wreck a transmission in just a few miles – takes moment to change.

I really do not think there is much in it, but aluminum crush washers tend to be a little softer than their copper counterparts and seem to seal better. Some people say that you can re-use copper crush washers more easily “if in a pinch”. I say, don’t get in a pinch.

Weeping push rod tubes are not uncommon. Replacing them on both sides is a long morning’s work and easy if you are organized and follow the script.

Most would advise you to check the timing and valve clearances, change the plugs and do a “quick” carb overhaul (i.e. leaving the throttle shaft alone if the butterfly seals OK, clean keeping any carb cleaner away from the throttle shaft o-rings, replace all other o-rings, check floats, check diaphragms, check float valve operation, new float bowl gaskets) and then get to carb adjustments/sync.
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Old 10-06-2012, 06:08 AM   #13
97oilhead
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Phil,

Barney is looking good, love the S fairing. Glad your registration went through.

My '95 R100R is my favorite Airhead. I am NW of London, so if you are riding down this way or feel like meeting up send me a PM.

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Old 10-06-2012, 06:13 AM   #14
backfill OP
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thanks

Thanks all for your kind words and great suggestions.

I agree with others - I think the peanut rocker covers are stock for the R100R. The 90s RS and RT had the squared covers, but I read somewhere that the R was a retro bike so it got the peanut style covers.

I have a BMW shop manual for this bike. Is it helpful to get the Clymer/Haynes manual for it as well?

If the drive shaft on the R100R is dry, does this mean that there are no splines to lube? I have read so much about lubing splines on a BMW airhead that i assumed that Barney would need it as well. If not, it is a good thing I didn't tear into it last winter! That would probably also explain why I couldn't find anything in the shop manual explaining how to lube the splines.

One of the first things I did was change the engine, transmission and rear end (final drive?) oil - this was done before riding it at all. I also changed the plugs and cleaned the carbs, but didn't replace any carb gaskets. I guess that should be done this winter. I will do that before trying to sync the carbs.

The pushrod seals are oozing a bit, not dripping but enough to get the oil pan messy. Because if this, i bought a new oil pan gasket thinking this was the problem, but haven't installed it since I determined that it is the seals. I spoke with the mechanic at the nearest BMW dealer and he offered to use the special BMW tool to reset the seals. He said it only takes a minute and he would do it for free. I will watch him do it the first time, then make a tool like the one that Bluethumb suggested. That certainly sounds like a great alternative; if that doesn't work I will try wiring them like Horsehockey suggested.

RedBud, nice bike! How do you like the fairing? A local guy was selling a white Windjammer fairing for $60 that he took off of a R100R, but I decided not to buy it. I thought it would look like a scoop of vanilla ice cream floating in a cup of grape soda. Besides, I have the little S type fairing which does a pretty good job of keeping me out of the wind. However, I might think differently now that the cooler weather is here.

Reading through the threads here on the airhead forum, the purchase price for Barney might have been a bit high. Even though it was not running when I bought it, Barney was in good shape and appeared to have been stored inside since the paint and plastic do not have the faded patina from too much sun and the bolts are not rusty. I paid $2000 for the bike with extras, bought tires, battery and new fluids. So far this has been a fairly inexpensive motorcycle purchase. I hope it stays that way.
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Old 10-06-2012, 06:24 AM   #15
bikecat
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Welcome Phil ....

Nice bike. You will love the low end grunt!!! Get the carbs balanced, it will make the ride smoother!!
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