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Throttle Shaft leaking on high mileage R1100RS

This is my first post on the “1100 S” forum. I’ve been a long time member of Pelican, working on my 1975 911S. I haven’t posted on here before because I have an RS, not an S - I have a 1995 1100RS with ABS and close to 100,000 miles. The mechanicals should be very similar between the S, RS, and GS, but the RS can carry my spare jacket, my lunch, and some water - and I can go camping………but the “S” forum doesn’t want to hear about a bike with bags..…

This forum has helped me make several repairs, including:

canisterectomy
brake shoes
changed brake fluid
rebuilt the front master brake cylinder
replaced the rear differential seal
new tires that I mounted and balanced myself
heated grips with factory switches
new ignition switch after the wires broke and I rode home with the bike cutting out everytime I turned the handlebars
many valve adjustments, oil changes, and air filter changes

Thanks to everyone that has contributed here for making it possible for someone like me to be able to own such a wonderful bike that I would never have been able to afford if I didn’t work on it myself.

In an attempt to cure a miss at idle (after 100,000 miles):
New battery
New ignition coil
New starter (the inexpensive French one - no issues so far)
new exhaust valves, seats and guides (the machining is the only work I have not done myself)
new piston rings
new intake seals
new injector seals
GS intake runners
GS cat code plug fuel mapping (GS parts made no discernible difference)
TPS setting
Balanced the throttle bodies using a home made manometer - multiple times.

The throttle body balancing would change depending the temperature of the bike, and I could make it run great, but it would not consistently stay great. I found that the throttle shafts were leaking by adding a couple pounds of pressure to the throttle bodies and using a soapy solution to see where bubbles were coming out. After 100,000 miles, the RS was doomed. These bikes are selling on Craigslist for between $2500 to $3500, and getting the throttle bodies rebuilt professionally looked like nearly $1000 each. Time to stop spending money and repairing things? Time for another bike? Then I spotted on eBay, a set of 1995 throttle bodies from an 1100 GS with 22K on them. I installed the low mileage throttle bodies this weekend.

Here’s the tools I used:
Home made pressure tester and low mileage throttle bodies.




Home made manometer board.



I tested all 4 fuel injectors (2 new low mileage ones, and my 2 old ones). I couldn’t really see any difference, so I used the 2 low mileage ones with my almost new seals. Installing the throttle bodies was pretty easy, getting the throttle cables back on was the only fiddly part. The idle screws were pretty close left to right, so I was hoping they were close to balanced. Not so lucky. After installing the throttle bodies, I went for a short ride to warm the bike up, then I connected the throttle bodies to my home made manometer board, and they were way off. I finally got them dialed in at idle and at 3500 RPM. Now the bike runs good, and the idle is consistent and doesn’t change with temperature. I’ll call that success.



Tomorrow is supposed to be beautiful here in the PNW. A friend and I are taking a ferry to Whidbey Island, riding up to Deception Pass, and lunch in La Connor (a tourist trap town). Should be a great day to miss work.
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Rex
1975 911s and 2012 Range Rover Sport HSE
1962 BMW R50/2, 1995 BMW R1100RS

Last edited by Walter_Middie; 03-11-2018 at 04:16 PM..
Old 03-11-2018, 04:13 PM
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You can also hook up the manometer to the bottom of the throttle body ( orifice where part number 14 (vacuum plug ) goes ).

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Old 03-11-2018, 09:07 PM
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Throttle Body Rebuild Kits are also available -

https://www.beemerboneyard.com/dcatatbkit.html
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2004 R1100S
Old 03-11-2018, 09:11 PM
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Quote:
Originally Posted by Walter_Middie View Post
...but the “S” forum doesn’t want to hear about a bike with bags..…
True. Because in general no S riders ever go anywhere requiring bags.


Lets see a picture of your Porsche.
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cRaIg CaRr
2000 R1100S, 2000 Dyna FXDX, 2015 rNineT. 2016 F800GS, 2016 Jeep Rubicon. 2001 Corvette, 1978 Porsche 928. Schwinn Homegrown MTB & Fastback Road Bike. 22 pairs of shoes. 44 bottles of beer.
Time Marches On: 2015 F800GS, 2010 F800GS, 2007 R1200S, 2003 Dakar, Buell 1125r, 2001 F650GS. 1999 F650. 1998 HD Sportster Sport. 2010 F150, 1995 GMC Sierra ALL GONE
Old 03-12-2018, 06:14 AM
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Although, when we do carry bags, some like bags like this:

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cRaIg CaRr
2000 R1100S, 2000 Dyna FXDX, 2015 rNineT. 2016 F800GS, 2016 Jeep Rubicon. 2001 Corvette, 1978 Porsche 928. Schwinn Homegrown MTB & Fastback Road Bike. 22 pairs of shoes. 44 bottles of beer.
Time Marches On: 2015 F800GS, 2010 F800GS, 2007 R1200S, 2003 Dakar, Buell 1125r, 2001 F650GS. 1999 F650. 1998 HD Sportster Sport. 2010 F150, 1995 GMC Sierra ALL GONE

Last edited by ckcarr; 03-12-2018 at 06:20 AM..
Old 03-12-2018, 06:17 AM
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I have no problems with bags on an S, I assume you are off on a ride and re packing gear to get there. I just added a Givi tank bag and use it around town to haul small stuff, except when commuting. Between the side bags and tank bag you should be able to pack for a 4 or 5 day trip.

I din't ride around with empty bags, that's just tacky...

I do admit that in January I rode the S and missed the full fairing from my K1100LT. I don't miss the full blast her from the K bike engine.
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Old 03-12-2018, 06:37 AM
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Took the que from the title and read most of this, but anyway, Bing sells throttle body rebuild kits. Search Bing online. They are definitely expensive as are their carb kits but what a difference they make.
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(R12, R11, R1) + 00 then S, S, /7
Old 03-12-2018, 09:11 AM
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Quote:
Throttle Body Rebuild Kits are also available -
I still think I did OK - 2 throttle bodies plus 2 injectors - for about the same price - and I didn't have to disassemble the old ones.

Quote:
Lets see a picture of your Porsche.


Quote:
Although, when we do carry bags, some like bags like this:
I could have used a cold beverage today - it was actually hot.

Quote:
read most of this
Sorry - it was a little long.
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Rex
1975 911s and 2012 Range Rover Sport HSE
1962 BMW R50/2, 1995 BMW R1100RS
Old 03-12-2018, 02:13 PM
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Hey, Walt,

The S and the RS are completely different bikes and engines. My S has bags, actually 3 sets, but that's another story. Some came with bags I understand.

The S engine is "very close to" the 1150 engine, shares a lot of parts, etc. The RS is very close to the RT. I have one of those, too.

Sounds like you did a heck of a job with the throttle bodies.

Someone on another forum recommended a set of tiny sealed ball bearings that fit the TB's shaft AND a small collar on the outside of the TB around the shaft. I bought them, never installed them. They were from a model airplane parts place as I remember. Didn't cost much. They would re-center the shaft in the TB and seal the annular space as well as reducing friction there.

If you can track down these bearings it might save you a lot of trouble and $. I believe it was on BMWsporttouring that I found the "how to" on the bearings.

http://bmwsporttouring.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=986646&page=1

All the best!!

Last edited by Lowndes; 03-12-2018 at 07:15 PM.. Reason: Added rebuild post
Old 03-12-2018, 06:20 PM
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Lowndes - great information. I wish I had known that before I started. I might try to fix the old ones as it sounds pretty inexpensive and easy.
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1975 911s and 2012 Range Rover Sport HSE
1962 BMW R50/2, 1995 BMW R1100RS
Old 03-13-2018, 03:30 PM
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Walter,

I came across the bearings today while looking for something else. Looks like I'll need another pair if that time ever comes. These look like shielded bearings instead of sealed bearings which might be better. I think I'll inquire if sealed are available and order two pairs.

I did slip these on the throttle plate shaft to see if they are the correct size and they are.

Now, if I can only find that sticker to get my 15% discount...

EDIT: I just got an email back from RCBearing - NO sealed bearings available in this size. I'm thinking a very small O-ring around the shaft between the TB and this bearing might work. I'd still like to protect the bearing itself from road dirt, rain, etc.

ReEDIT: I just got another email from RCBearings. They will order the SEALED bearings, 8 x 13 x 3.5 with their next order. He says it will take "about 3 weeks". That will be about Apr 10, '18.





Last edited by Lowndes; 03-19-2018 at 05:30 AM..
Old 03-18-2018, 07:13 AM
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911s

Quote:
Originally Posted by Walter_Middie View Post
I still think I did OK - 2 throttle bodies plus 2 injectors - for about the same price - and I didn't have to disassemble the old ones.





I could have used a cold beverage today - it was actually hot.


Sorry - it was a little long.
Looks like my ole '77 911S. Nice. Mine had a red interior. Electric sunroof?
Old 03-18-2018, 07:28 AM
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