Pulled the plugs, peaked in with the borescope
Hmm.........
Hmm.........
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Rabbit holes are me BMW R50/2
- Thread starter gggGary
- Start date
Oh shit
It's SO hard to get the head off.
15 minutes later.
Anyone know a Beemer head expert? Looks like a new valve seat will be most of it.
15 minutes later.
Anyone know a Beemer head expert? Looks like a new valve seat will be most of it.
Seat came out of the head??
Can the piston still be used?
Well, I never saw that happen, to any bike, lol.
Many Beemer shops in the late '80s and '90s did seat replacements (with unleaded compatible seats). Not sure about today. You probably noticed the no valve guide seal thing. BMWs relied on the snug fit between the valve stem and guide bore to "seal" the oil out. But, I've heard of guys installing seals, Yamaha seals in fact. It just requires a groove be machined into the top of the guide for the seal to snap into.
Last edited:
WOW!
Yeah I'll pop it out of the bore make sure the lip, top ring groove are OK but I think it's fine.
i've been checking out the blog of these guys from time to time. they will probably fix the seats for you: https://www.yelp.com/biz/scotties-workshop-murphys
So, it's a thing.
https://w6rec.com/heads-and-butterheads/
Have a "head shop" name to call tomorrow.
Dave's not here.....
https://w6rec.com/heads-and-butterheads/
Have a "head shop" name to call tomorrow.
Dave's not here.....
Did a quick search in Europe looks as new is out there ... Not Cheap 625 Euro but if mileage is right perhaps worth it
googled
bmw motorrad r50/2 zylinderkopf reparatur
googled
bmw motorrad r50/2 zylinderkopf reparatur
Wow, I never knew that about /2 heads. I never had a /2 motor though, my /2 was a "conversion", a /2 rolling chassis with a later motor stuffed into it, in my case a '76 R90/6 motor. Being that the largest /2 was only 600cc, this was done to give the bike more power, and in particular, for pulling a sidecar. BMW had "sidecar gearing", a different rear pumpkin with lower gearing, for sidecar use, but they are quite expensive, if you can even find one today, lol. My R90/6/2 pulled a sidecar just fine with the stock gearing.
And speaking of sidecars, your R50 has the mounting points welded right to the frame, all you need is a couple eye bolts for the uppers and a replacement front lower motor mount with the ball on one end. The lower rear ball mount is welded to the frame. BMW used to sell this as a "kit", don't know if it's still available today. Here's one for an even older model .....
https://www.ebay.com/itm/1430132309...XxPWaOL-Gibs4jirOZGCCed63Z6pCIa_TPY5AJk&gQT=1
https://www.ebay.com/itm/1430132309...XxPWaOL-Gibs4jirOZGCCed63Z6pCIa_TPY5AJk&gQT=1
How hard would that be? asking for a friend.
Charles13
XS650 Addict
The valve train is very different on these bikes talk to Hans at BMW Hucky he knows these things inside out, is a very personable guy although you will most likely have to phone him but… it will be so worth your time he will have you up and running in no time.
Nice find. Put /2 bars on my /5 like them better.
Another good Air head parts source is https://www.euromotoelectrics.com/default.asp
Another good Air head parts source is https://www.euromotoelectrics.com/default.asp
Wow! That is a stunning R75, do you still have it? For a moment there I thought that was the inside of your garage!
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