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PostPosted: Sun Jan 08, 2017 5:44 pm 
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Newbie
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Joined: Sun Jan 08, 2017 4:02 am
Posts: 2
Location: Town Of Lisbon, WI
Location: Milwaukee,WI
I am in the process of restoring a 91 DR650 from the frame up. Tearing down the bike I have found the dreaded top end damage from being starved for oil. Does anyone have a lead or wants to sell a decent or NOS top end? I am thankful for any lead you may have and have found this site extremely valuable towards all things DR.
This is my third DR. I have previously had later model machines and this one is throwing me with the lack of parts and uniqueness of the motor. Too bad as the larger gas tank and apparent more power had really had me initially motivated on this build.
I have so far done the air box mod, MXRobs carb mods (FCR) and going with the wanna b Dakar look. May be a lawn ornament if I cannot find this top end.
On another idea, Does the earlier 750cc top end fit on top of this bottom end? The dual exhaust version from the 80's? I also realize the cover and valve side was machined as a matched set but is it totally a waste of time and money buying a cover as that is the part of mine that faired the worst on the damage. There is a process called spray welding and I can totally see this as a perfect application for it but do not know if Tig or spray welding and then machining back to spec is even an option or is the cost totally prohibitive? It seems if someone could set up a spray weld process they could provide an invaluable service to many of these and other similar machines that suffered from this problem over the years.
Thanks for this site and thanks in advance for your help and advice.
Sincerely,
Jeff


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PostPosted: Fri Jan 13, 2017 8:21 am 
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Adventure Rider
Adventure Rider

Joined: Mon May 02, 2011 8:21 am
Posts: 568
Location: QLD, Australia
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Before you go too far, take the head and valve cover to a cylinder head specialist or a machinist and ask them to measure the bearing journals. Mine looked pretty bad, but suprisingly, it was still with-in the wear limits that are listed in the manual.

Image

Image

The guy that measured mine said it would be fairly easy to line bore the journals and fit either bronze or white metal bearings (half shell, like the rod and main bearings of an automotive engine)

In the end, it depends on how much you want to spend

Good luck


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PostPosted: Thu Jan 26, 2017 2:10 am 
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Joined: Sun Jan 08, 2017 4:02 am
Posts: 2
Location: Town Of Lisbon, WI
Location: Milwaukee,WI
great advice. I will search for the correct specs and set off to find a machine shop capable of line boring my DR's head. I did not know they made small crankshaft type bearings. Since the DR project is on hold, I am rebuilding a 73 Jeep commando and using Clevite and Federal bearings all through the motor. Clamshell bearings is a great idea. Thank you, Jeffhttp://drriders.com/posting.php?mod ... 8&t=19601#


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