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Old 05-06-2012, 11:54 PM   #31
defib
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Joined: Jul 2011
Location: Winslow AZ.
Oddometer: 192
It sounds like a bent or stuck valve.

Your on the right track. if its popping back into the intake you probably have compression leak. if your worried about whether or not you have the cylinder at TDC then remove the rocker arms from the valves. they should then be seated no matter what position the piston is in. If you still have a leak into the intake then you have to pull the head to see if its a valve or a cracked seat. Good luck!
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Old 05-07-2012, 05:30 PM   #32
jameswhitaker OP
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Well, the good news is that there is no indication of a bent valve. The bad news is...WTF?! I'm still waiting to hear back from the machine shop to see if they see any issues. He did mention that the head gasket was beginning to blow, so I guess there's enough justification for the job right there, but it doesn't really explain anything. Beginning to blow is quite a bit different from blown. Maybe they'll find that the valve has some sort of carbon deposits jammed up on the seat or something.

There is also some damage on the intake cam lobe, though I'm not sure it serious enough to justify $330 for another camshaft.

http://www.flickr.com/photos/5077428...n/photostream/

On the upside, I noticed that I have yammered enough to be upgraded from 'Noob'. I guess I should throw a party. Oh look, here's a beer next to my hand. I guess I'm already partying...

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Old 05-08-2012, 08:58 AM   #33
scrannel
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Had an airhead once that had a "sort of blown" head gasket. Sucked in air through the tiny "crack" in the gasket, caused detonation, deformed the head in that area and caused the rocker to fail. FWIW
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Old 05-08-2012, 11:42 PM   #34
jameswhitaker OP
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OK, well, I think I finally have an answer. My brother had an idea that maybe a chunk of carbon had gotten jammed under a valve seat, but it turns out that a chunk of carbon may have gotten blown OFF of the valve seat. The valve seats were heavily corroded, probably from the bike's long stint in the rain. The guys at the machine shop think that the only reason it had compression at all was the carbon that formed what was left of the valve seats. Check out the pictures:

http://www.flickr.com/photos/50774289@N06/7162955034/

Thanks, guys, for all of the help and support. I'll let you know when I get everything back together if it runs...
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Old 05-09-2012, 12:08 AM   #35
defib
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holy cow!

Yeah I think you found your problem. Can he replace the seat or regrind it? Or would it be cheaper to replace the head with a used one?
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Old 05-09-2012, 12:17 AM   #36
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Actually one of the machinists at this shop has a 1995 R1100GS and he said these motors don't like their seats too deep and besides at least one or two of the seats are beyond any reasonable grinding anyway. So, it's seats, guides and seals all around. $220 plus parts. The valves look very good though, thank God...

Now I have to look around and see if there are any deals to be had in the parts department.

I thought about the used head, thing... I'll look into it, but I have concerns about paying $200 for a head only to find that I still have to replace seats and guides anyway...
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Old 05-12-2012, 08:45 AM   #37
Mrmerlin
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This is good news that the valves were not working as designed so once the head is repaired then you ought to have great running bike
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Old 05-12-2012, 02:38 PM   #38
ttpete
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Might want to have a look at the other side.
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Old 05-12-2012, 03:08 PM   #39
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Yeah, of course that's what the guys at the machine shop said and I said, "No, you're wrong. I do NOT want to look at the other side."

I figure I have enough trouble in my life already, I have a policy of not actively looking for more.

Also, the other side has good compression and runs fine. I did buy a used 1997 RTP head for the right side, so I'm hoping that will be a cheaper way out. I plan to do a leakdown bench test on it when I get it and do a visual check and some measurements to see if it's actually the same part. BMW has changed part numbers so many times that it's impossible by any means at my disposal to cross check part numbers. This is just one more frustration with working on these bikes. Plus the part number on the older heads is hidden under the rockers. To make a short story long, I have never seen another head that had the same part number as mine and it's not the current part number for the head either. There seems to have been a change at some point where the heads got a waffle pattern on the surface under the rockers and the only heads I've seen that don't have that pattern are the ones on my bike and some on a pre-1995 bike, which is supposedly not compatible.
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Old 05-14-2012, 09:28 AM   #40
Kurt Snyder
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Looking at the Max BMW parts list, the valve size changed on bikes manufactured after 10/95. Early valves are larger. I don't know if you can put a matched pair of post 95 heads on a earlier oilhead. Good luck.

Kurt
95 R1100RSL
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Old 05-15-2012, 10:45 PM   #41
jameswhitaker OP
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Yeah well, according to realoem.com, my bike was made in 10/95 and is of the later series regarding the heads, but the head from the 1997 (which I received today) does not match the existing head. You were right, the new head has much smaller valves. It's just my luck to be cursed with a transitional model whose serial number doesn't match its parts. I am just about done tearing my hair out with this bike. I can't afford to flush any more money down the drain and I think it's about time to part it out. I'll start with a 1997 RTP head (right) - any takers?

Actually, very likely I'll take this head apart, clean up the valve seats and take closeups of the valve and valve seat condition and that should be enough to sell it on ebay for what I have into it, as no one else ever bothers to examine the functional condition of the parts they have listed. Still, I am despairing of ever getting the motorcycle to even idle while it is still summer, let alone having it on the road.

I did check out Max BMW and, just FYI, the part number on my head and the part number on the head I bought are both absent from their timeline.

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Old 05-16-2012, 08:56 AM   #42
ttpete
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Quote:
Originally Posted by jameswhitaker View Post
Yeah well, according to realoem.com, my bike was made in 10/95 and is of the later series regarding the heads, but the head from the 1997 (which I received today) does not match the existing head. You were right, the new head has much smaller valves. It's just my luck to be cursed with a transitional model whose serial number doesn't match its parts. I am just about done tearing my hair out with this bike. I can't afford to flush any more money down the drain and I think it's about time to part it out. I'll start with a 1997 RTP head (right) - any takers?

Actually, very likely I'll take this head apart, clean up the valve seats and take closeups of the valve and valve seat condition and that should be enough to sell it on ebay for what I have into it, as no one else ever bothers to examine the functional condition of the parts they have listed. Still, I am despairing of ever getting the motorcycle to even idle while it is still summer, let alone having it on the road.

I did check out Max BMW and, just FYI, the part number on my head and the part number on the head I bought are both absent from their timeline.
The numbers cast into the heads are probably the numbers for the raw castings that would identify them for production and machining purposes. That would account for not seeing them in a parts listing.
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Old 05-16-2012, 10:25 AM   #43
DOGSROOT
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Eh? Good luck

Hey JW,


I have followed this thread w/ both curiosity and awe, as I am limited to brake pad, fluid changes and electrical issues by mechanical ignorance, two left thumbs, and a pathological fear of
NOT BEING ABLE TO RIDE because I've gotten in over my head.

(Hi, my name is Dogsroot, and I am an addict).


So when I follow you DIY guys w/ your advice and help, I do so w/ great admiriation, and a little envy.

I vow that once I am a "two bike at the same time" kinda guy, I'll attempt some of these feats of engineering as well.

Lovely bike, the R1100RS.

I ride it's distant cousin, the K1200RS, and recently had a nice impromptu ride w/ a fellow on a R1100RS that I ran into at a gas station.

Would love to have one in my "stable" one day...




So... Do Not Dispair!!!!!



Good Luck, and I hope you will be riding ASAP!!!!!



DR
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