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Old 10-10-2012, 06:43 PM   #1
lucky6600 OP
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What would you do if you were me?

I was searching for a gas tank and valve cover for one of the projects last year, and found one of my friends has a 71' BMW R60/5 in his garage for years.
This is where it was when I found her.








So I found my gas tank and valve covers, and the rest of the bike just came with it. I paid his asking price which was little high, but I was kinda helping out a friend through his financial hardship.









It has been served as a great "OEM" part bike for my others in many ways, and never make a complain.







Now, the /7 has gone and been enjoying by the new owner, and this is it's turn during the process of "down size" my garage. This is also the very first time that I have a chance to take a deep looking of her.







And found this....... it appears to me that gas over flow over the carb and get into the engine. This is also the reason why the engine is NOT turning.








The interesting part is the carb is clean, and only the chamber is messed up and still wet.













At where I am now, those are the options,

1) Sold it "as it". This is the easiest way.
2) Part it out. This is the most profitable way, but with the time of taking parts off, Ebaying, emails, and shipping, for few hundreds bucks. It doesn't really look that much profitable.
3) Bring it back to life. I can either do it back to as OEM as possible (found another "part bike" in boxes for the same year and same model), or I can cafe/bobble/scramblers it to whatever I want (which supposed to be done 4 bikes ago).



Option 3 might seem to be the most costly option up front, but consider I really like to have something newer, lighter, and has a red frame, Option 1 and 2 are actually cost me more in the long run.
So, if you were me, what would you do?
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Old 10-10-2012, 07:05 PM   #2
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Against my better judgement, I ressurected a 1978 R100S engine which had set out for at least a dozen years. It had similar H2O penetration to one side and both rockers had developed rust. After a thorough cleanup, it wasn't really that bad. ended up just honing the cylinders as the rust hadn't pitted anything. The cylinders had a visual "stain" after honing but in "mic'd out fine and with some new rings / valve regrind we were on the road. While I was in that deep I went ahead and pulled the rods to take a peak at the rod bearings. They showed some discoloration ( maybe from heat?) but were probably OK, I changed them anyway since I was in the neighborhood. The one thing I over looked was a tiny pit on an exhaust valve spring which later caused the spring to break, slightly swallowing an exhaust valve and "dinging" up a piston.
Might be worth a deeper look before piecing her out. I think the R60 engines are pretty good candidates for rebore's (if needed) since there is a lot of "meat" on those cylinders.
Guess it really comes down to "how much can I afford...or want to spend".
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Old 10-10-2012, 07:11 PM   #3
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Save it, or pass it on to someone who you feel confident will. I'd hate to know that these bikes are being dismantled, never to run again.

An old friend stopped by the shop today and found me working on a /7. Somewhere in the conversation I said, "These are the bikes that made BMW"
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Old 10-10-2012, 07:41 PM   #4
Bill Harris
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If BMW hadn't developed the new and radical /5 series in 1969 the company probably would have bellied up by 1970. Can you imagine competing against the Japanese onslaught with an R90/2?
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Old 10-10-2012, 08:52 PM   #5
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Quote:
Originally Posted by Bill Harris View Post
Can you imagine competing against the Japanese onslaught with an R90/2?

No, but I`d love one to haul a sidecar.
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Old 10-10-2012, 10:55 PM   #6
Mark Manley
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It looks like the kind of expensive, pointless but ultimately satisfying projects I would tackle, go for it.
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Old 10-10-2012, 11:41 PM   #7
bmweuro
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Your /5 looks like a 72. I would keep it and fix it, there is a ton of R60/5 and 74-75 R60/6's engine parts out there.
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Old 10-11-2012, 04:55 AM   #8
Bill Harris
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Quote:
Originally Posted by GSD4ME View Post
No, but I`d love one to haul a sidecar.
That would be awesome...
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Old 10-11-2012, 06:32 AM   #9
some_guy
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Fix it or sell it to someone that will.
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Old 10-11-2012, 12:21 PM   #10
bmwblake
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the year on the head says 71.
i've got some r75/5 heads, pistons, and valve gear (no extra barrels) that i could let go of for a deal if you decide to keep the bike and work on it.

i vote for bringing it back. i'm sure everyone else here will as well. you're asking junkies if you should go for another fix.


Quote:
Originally Posted by bmweuro View Post
Your /5 looks like a 72. I would keep it and fix it, there is a ton of R60/5 and 74-75 R60/6's engine parts out there.
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Old 10-11-2012, 01:11 PM   #11
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This.

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Old 10-11-2012, 01:31 PM   #12
lucky6600 OP
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Quote:
Originally Posted by bmwblake View Post
the year on the head says 71.
i've got some r75/5 heads, pistons, and valve gear (no extra barrels) that i could let go of for a deal if you decide to keep the bike and work on it.

i vote for bringing it back. i'm sure everyone else here will as well. you're asking junkies if you should go for another fix.

I don't think the 60 barrels would take R75 pistons, right?



Quote:
Originally Posted by pbarmy View Post
This.

I really like the way you are thinking


Quote:
Originally Posted by bmwhacker View Post

Guess it really comes down to "how much can I afford...or want to spend".




Yes, Money talks, but after I test rode a 12' Ducati Streetfighter 848 for about 30 miles, I realized those <400 lbs bike with 131 hp does nothing to me. Maybe that says I am old, 36 yrs old here BTW.
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Old 10-11-2012, 01:43 PM   #13
lucky6600 OP
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It looks like everyone here suggests fixing it up and making it runs again.

After this powerful clip which I believe many of you might have watched already.

http://vimeo.com/49920522

And spent some time on this thread,

http://www.advrider.com/forums/showthread.php?t=678840


I have a pretty clear direction about this bike at this point. Let's having the fun begins.


For taking the engine off, the exhaust must be off first. Those 2-1 is major pain in the butt to take off with everything all connected together and sealed with rusty.




After some cooking and working on the top end and the cylinder, it's actually not as bad as I expected.

I mean I actually cooked it,












The problem is the piston is sized .....










Any suggestions??
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Old 10-11-2012, 02:46 PM   #14
bmwblake
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you'd have to bore your pistons, but you have enough material in the sleeve to handle it. also, as i learned the hard way, the r50 and r60 have a different cam than the r75, so if you go with bigger jugs you'll need a cam as well. pretty sure i have another sitting around that would work for you.

as for the stuck piston, i'd want to work on it with the jug still against the block otherwise you'll be fighting the just moving all the time. if you can get the motor out and sit it on it's side you could put penetrating oil on top of the piston and let it soak. patience and heat will be your friend.



Quote:
Originally Posted by lucky6600 View Post
I don't think the 60 barrels would take R75 pistons, right?
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Old 10-11-2012, 08:05 PM   #15
Kai Ju
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Something to try

I don't know if this will work but might be worth a try.
Soak the piston with a 50/50 mix of acetone and ATF for several days.
Fab a cross brace of stout steel that will go across the bore between the two studs that are part of the cylinder.
Drill and tap a center hole for a large fine pitch threaded bolt in the center of the brace.
Bolt the cross brace to the cylinder at the studs.
Place a piece of stout aluminum between the center bolt and the piston top. Tighten the center bolt to drive the piston out of the bore.
Let us know if that works
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