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Old 04-20-2008, 02:23 AM   #1
stevh0 OP
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XR650 L vs R

Sure the XR650R is the king of baja and more often then not the R gets the decision above the L ,just becos of that.

The R certainly has more power in stock form and it also weighs alot less.

Engine wise they are very similar , with the R just having .2 over in stroke.

what would happen when you match the L's 8 odd compression to the 10 odd compression of the R?

Would this not be a bit more of a monster with a happy button?
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Old 04-20-2008, 04:26 AM   #2
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Quote:
Originally Posted by stevh0

Engine wise they are very similar , with the R just having .2 over in stroke.
Huh?!
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Old 04-20-2008, 04:40 AM   #3
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XR650R bore and stroke - 100mm x 86.2 - C/r 10.0.1
XR650L bore and stroke - 100mm x 86 - C/r 8.3.1

Higher C/r = more power.

Make sense now?
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Old 04-20-2008, 05:12 AM   #4
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The two engines are totally different. The L motor is an 80s vintage air cooled 650 based on the XR600R with electric start added. The R is a much newer designed water cooled motor that is way more maintenance intensive and produces a LOT more power.
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Old 04-20-2008, 05:16 AM   #5
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the question is ..

what if you upped the C/r of the L to the same as the R or even higher..

You could gain some valuable Hp there.


I can see why they kept it low, making it a stress free engine. But upping the C/r could be beneficial.

The R is by FAR more superior.
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Old 04-20-2008, 05:23 AM   #6
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Without some kinda oil cooler installed, the L wouldn't be able to stand the heat generated by the R's compression ratio.
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Old 04-20-2008, 05:29 AM   #7
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Quote:
Originally Posted by stevh0
the question is ..

what if you upped the C/r of the L to the same as the R or even higher..

You could gain some valuable Hp there.


I can see why they kept it low, making it a stress free engine. But upping the C/r could be beneficial.

The R is by FAR more superior.
My L' comp ratio is higher than the R's and I'm somewhere near 680cc. Yes the power went up BUT it is not nor will it ever be on par with a R. Two different animals.
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Old 04-20-2008, 05:32 AM   #8
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Quote:
Originally Posted by michaeln
Without some kinda oil cooler installed, the L wouldn't be able to stand the heat generated by the R's compression ratio.
Yes it can, and has for about 4000 miles now Even when loaded
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Old 04-20-2008, 05:46 AM   #9
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Quote:
Originally Posted by stevh0
XR650R bore and stroke - 100mm x 86.2 - C/r 10.0.1
XR650L bore and stroke - 100mm x 86 - C/r 8.3.1

Higher C/r = more power.

Make sense now?
Oh yeah. Perfect sense. Thanks for clearing that up.
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Old 04-20-2008, 06:18 AM   #10
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Quote:
Originally Posted by michaeln
Without some kinda oil cooler installed, the L wouldn't be able to stand the heat generated by the R's compression ratio.
Gee, I guess you're probably right, the 28,000 miles my modded L has on it must be just a fluke?
I was torn between getting a new L and building it up vs a new Husky 610 and I tired of waiting on ktm's 690 adv.
Yesterday I got back on the xrl and gave my brother a turn on the Husky and stopped after a mile convinced the front tire was flat. It wasn't, just the extra 50lbs.
My 93 L isn't really worth much dollar wise but it would be hard to part with.
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Old 04-20-2008, 06:25 AM   #11
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Quote:
Originally Posted by stevh0
the question is ..
what if you upped the C/r of the L to the same as the R or even higher..
You could gain some valuable Hp there.
I can see why they kept it low, making it a stress free engine. But upping the C/r could be beneficial.
The R is by FAR more superior.
I think the L is low compression so they could meet emissions standards for a street legal dual sport. They are also jetted horribly lean and a CV carb to boot.
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Old 04-20-2008, 07:03 AM   #12
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?????

Quote:
Originally Posted by michaeln
The R is a much newer designed water cooled motor that is way more maintenance intensive and produces a LOT more power.
I've had one of each over the years and the 650R is hardly more maintenance instensive. Water cooling adds a dimension of complexity over the old XR600, but hardly significant and with possible benefits for long term durability... and certainly performance!
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Old 04-20-2008, 07:11 AM   #13
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I am very curious as to what exactly is 'more maintenance intensive" meaning? What is it about the R that makes it such hungry wrenching beast? Does someone have a break-down of the two schedules side by side?
Also, how does the R stack up maintenance-wise relative to say a ktm 640?
Cheers.
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Old 04-20-2008, 09:27 AM   #14
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Quote:
Originally Posted by roadholder
I've had one of each over the years and the 650R is hardly more maintenance instensive. Water cooling adds a dimension of complexity over the old XR600, but hardly significant and with possible benefits for long term durability... and certainly performance!
+1 on that.
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Old 04-20-2008, 09:30 AM   #15
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what is your 650R service interval like?
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