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Old 09-25-2013, 07:04 AM   #31
AliBaba
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Quote:
Originally Posted by georgesgiralt View Post
When they planned the monoshock bikes, BMW had a will to go from 650 up to 1000 cc. And then then thought that keeping two different engines in the production line was too costly. So they used the 247 base (with some little improvements) to produce all cubic volume needed.
This is why the R65 has lost what was it's strength and attractivity : stamina, and smallness !
The R65 pre 85 is a wonderful machine, apt to compete with the 1000 even if less powerful, the last models are real dogs.
And you'd better buy an R80...

All the R65 share the same crank so they all have short stroke. This means that the housing are different on R65 and R80/100.

Note:
Some R65s used a 308 camshaft, but this is not the same camshaft used for R80/100.
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Old 09-25-2013, 01:15 PM   #32
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Alibaba, I strongly disagree.
All pre 1985 R45 and R65 share the same crankshaft which gives a shorter stroke than the R75/80/90 and 100.
But after 1986 all airhead no matter which displacement, have the very same crankshaft. As they produced a full range from 650 to 1000 displacement, .... the crankshaft should be the same
You can check, if you want, with the part number for the crankshaft before and post 1986.
It is obvious if you actually look at the bikes. "old" R65 have a smaller engine than "new" R65....
As I doubt you had a lot of R65 made after 1985 in the US or Norway I understand you can be mistaken ;-) But given the number of such bikes one see in ex police junkyard in France, you've to be very cautious when buying parts for an 1982 R65 ... Otherwise, you have to try to make the junkyard owner give your money back... Guess how I know ?
P.S. : the "new" R65 is a real dog. The police complained about it in France, and, as the French customs officer where given the quite identical R80 but more powerful and a joy to ride, they complained more and more, and, finally they had new bikes more powerful ....
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Old 09-25-2013, 01:25 PM   #33
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Quote:
Originally Posted by georgesgiralt View Post
Alibaba, I strongly disagree.
All pre 1985 R45 and R65 share the same crankshaft which gives a shorter stroke than the R75/80/90 and 100.
But after 1986 all airhead no matter which displacement, have the very same crankshaft. As they produced a full range from 650 to 1000 displacement, .... the crankshaft should be the same
You can check, if you want, with the part number for the crankshaft before and post 1986.
It is obvious if you actually look at the bikes. "old" R65 have a smaller engine than "new" R65....
As I doubt you had a lot of R65 made after 1985 in the US or Norway I understand you can be mistaken ;-) But given the number of such bikes one see in ex police junkyard in France, you've to be very cautious when buying parts for an 1982 R65 ... Otherwise, you have to try to make the junkyard owner give your money back... Guess how I know ?
P.S. : the "new" R65 is a real dog. The police complained about it in France, and, as the French customs officer where given the quite identical R80 but more powerful and a joy to ride, they complained more and more, and, finally they had new bikes more powerful ....
Are you sure you aren't referring to the detuned R65 mentioned earlier? I can't find ANY mention of late R65s have the same stroke as the R80 and R100 models in any specifications I have laying around. That's the first I've heard of this.
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Old 09-25-2013, 01:58 PM   #34
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OK, just did a little simple research on the BMW Fiche. Went to 2 different sources. Max BMW as well as talked directly with Shane at Shail's Motorcycle who looked it up on his old Fiche as well as on his electronic one. Just to be certain.

From 1978 through to 1992, ALL R65 and R45 engines used the same crank and block, which is different from any other engine.

There were 2 different Camshafts used in 87-92. Prior to that, all the same.
01 11 21 1 336 439 CRANKSHAFT 78-85
06 11 31 1 335 181 CAMSHAFT - 308DEG 78-85
01 11 11 1 337 343 ENGINE HOUSING


01 11 21 1 336 439 CRANKSHAFT 85-87
06 11 31 1 335 181 CAMSHAFT - 308DEG 85-87
01 11 11 1 337 343 ENGINE HOUSING


01 11 21 1 336 439 CRANKSHAFT 87-92
06 11 31 1 335 181 CAMSHAFT - 308DEG 87-92
06 11 31 1 337 922 CAMSHAFT - 256DEG 87-92
01 11 11 1 337 343 ENGINE HOUSING

So, as the Crank and block are the same in all of the R65/45 engines, then differences for the low powered R65 must be with the 256DEG cam and other detuning parts.
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Old 09-25-2013, 11:21 PM   #35
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I very much apriciate all of you guys taking time to answer. I belive I'm coming close to a final decision. Although an R80 engine would be a very nice solution, I think I will stick with its own R65 engine and work a little bit on it so it will get stronger. Dont forget its a 1990 model so all parts are interchangeble. According to Ulismotorrad mechanic to which I emailed the same question by changing the camsaft alone the engine gains about 10 hp. A pair of 32mm BING carbs can be purchased by a friend who is upgrading his R100 to the big bore kit and 40mm BING carbs, so things are on their way. Next step will be to find a pair of cylinderheads. I am not a speed freak after all even though the bike is a cafe racer I recently built ( didnt mention it before). Any more sugestions or talking about it will be taken under consideration though.

P.S. 1 any answers for message #24 ?
P.S. 2 how do I attach images?
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Old 09-25-2013, 11:48 PM   #36
georgesgiralt
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DaveBall,
I just checked and you're right for the R65 ! So now I wonder what kind of bike the French Police get. ! I can assure you that getting parts from these bikes and trying to fit them on a plain R65 is impossible !
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Old 09-26-2013, 12:21 AM   #37
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Quote:
Originally Posted by tafouras View Post

P.S. 1 any answers for message #24 ?
P.S. 2 how do I attach images?

You need the R45/R65 308 camshaft. If still in doubt check out one of the online parts fiches to compare part number for early and late R65's as Daveball did above.


You can't upload pictures to this site. You have to insert a link to another website or photo sharing location.
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Old 09-26-2013, 02:08 PM   #38
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Quote:
Originally Posted by georgesgiralt View Post
DaveBall,
I just checked and you're right for the R65 ! So now I wonder what kind of bike the French Police get. ! I can assure you that getting parts from these bikes and trying to fit them on a plain R65 is impossible !
The French bikes have the same engine as the other R65's. All the parts should fit. I Have one my self and have no problem with changing parts from other R65 's
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Old 09-26-2013, 02:11 PM   #39
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I'm completely confused
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Old 09-26-2013, 11:29 PM   #40
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I'm completely confused
But why?
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Old 09-27-2013, 01:10 AM   #41
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I've done the engine upgrade.
Went from a R65GS 20KW to the R65LS 37KW.
Changed the heads, carbs, pistons, camshaft and the top air filter piece (one big one small pipe instead of two small pipes, don't forget that one!)
BIG difference in power, a bit more low end, end where the 20kw version stops the 37KW keeps going in the high revs.
I still have the short final drive (31/9) sometimes i think its faster then a R80.
You will still lose it on te straight above 140km/h but who cares.
I like the small engine of the R65 more than i like the bit extra power of the R80.

I do think you need to do the complete swap, all the 20kw to 37kw parts are a big difference, i don't think it will work well if you only do some parts.

My top speed with short final drive and 17" rear wheel (supermotard ) was 168km/h on the gps (over 180km/h on the speedo)

So against all the NO sayers, i'll tell you, Do it if you can get ALL parts for cheap.
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Old 09-27-2013, 02:10 AM   #42
tafouras OP
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Originally Posted by Dmaster View Post
I've done the engine upgrade.
Went from a R65GS 20KW to the R65LS 37KW.
Changed the heads, carbs, pistons, camshaft and the top air filter piece (one big one small pipe instead of two small pipes, don't forget that one!)
BIG difference in power, a bit more low end, end where the 20kw version stops the 37KW keeps going in the high revs.
I still have the short final drive (31/9) sometimes i think its faster then a R80.
You will still lose it on te straight above 140km/h but who cares.
I like the small engine of the R65 more than i like the bit extra power of the R80.

I do think you need to do the complete swap, all the 20kw to 37kw parts are a big difference, i don't think it will work well if you only do some parts.

My top speed with short final drive and 17" rear wheel (supermotard ) was 168km/h on the gps (over 180km/h on the speedo)

So against all the NO sayers, i'll tell you, Do it if you can get ALL parts for cheap.

That is exactly what I havein mind, thank you very much, I will have more questions for you. Get ready for it. BTW where exactly in Netherlands you live?

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Old 09-27-2013, 02:38 AM   #43
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when you are talking of changing carbs as well you are refering to BING 32 or another make like mikuni or something else?
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Old 09-28-2013, 08:25 AM   #44
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Originally Posted by tafouras View Post
when you are talking of changing carbs as well you are refering to BING 32 or another make like mikuni or something else?
I had a R65LS as a donor, so i got all the stuff from that bike including carbs. :)
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Old 10-03-2013, 03:44 AM   #45
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just bought a pair of R65LS cylinderheads with valves and also a 308 deg. camshaft of the same model. Year of production is 1985 and it has about 50k km running life according to the seller.
Do you have any suggestions about the valve seats? Change them or not?
Anybody knows the code of the apropriate BING 32 carbs?
Looking for the rest of the parts...............
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