Just got an r65

[tunnelrider]

Welcome Stu, got the beginnings of a great bike there mate, glad you sorted the h/bars if you continue the cafe look, or have you gone scrambler already?  The R65 are good on gravel, make sure you look around the corners though as they're relatively heavy for their wheelbase!

[stubmw]

Ok, update,
This project could have gone a bit pear shaped.
 After montmil pointed out the bike had an earlier engine than the chassis i asked a bike shop to check and they confirmed  it ti be a '79 engine. OK
This weekend after checking through  the carbs for some  flooding i noticed the numbers weren't  giving it as a 32mm . Upon further investigation on the interweb i find it's
  an r45, oh no, will i still be allowed in the club.
Obviously a bit disappointed,  but I've  really taken to this bike. She runs sweet, sounds good and makes me grin.
Not knowing bm's well i had in my mind the engine and chassis no's don't match,  this is apparently much later models. I checked the frame no. matched the documents so thought it was all good.
 Way forward.... try to get a refund, probably not going to happen without mucho hassle, (Buyer beware).
Hang on to her as she is and have some slightly slower fun than anticipated  and maybe put a r65 engine in if one comes along, (do the engines, gearbox, final drive match up on the various years 45/65's)? Plus side seems pretty frugal on the fuel.
 Here's  a picture of the latest incarnation..... everywhere i stop people comment on how great she is
Wadda ya all think?
Stu

[stubmw]

New update,  
The plot thickens. ... or not. What seems to be, is this, I have an r65 1982 on the registration documents and everything is in order. At some point she's had a new bottom end etc. from an r45 manufactured 1979.  The barrels/heads are 650 but running on '45 carbs. She pulls like a train if you ask me, sits at the motorway speed with ease and runs sweet as a nut. Covered 1000 miles in the month we've been together, no issues other than a blocked in line fuel filter. Stu is happy

[Barry]

do the engines, gearbox, final drive match up on the various years 45/65's

Gearbox ratios are the same regardless of model year or R45 vs R65, only the final drive ratios are different.

R45 would have a 35/9  (3.89) final drive matched with a 1441 speedo
R65 would have a 31/9 (3.44) final drive matched with a 1276 speedo

If you have R45S carbs they will be 28mm.  I guess they will knock something off the top end which is largely academic for most people. In more normal riding they may well function better than 32mm in the low/mid range.  Most engines are over carbed to achieve the headline horsepower top speed that no one ever uses except just the once to see what it will do.

Not that it matters but the final drive regardless of what the ratio is, did not come from an 82 model. The fact that it's a smooth case dates it as 78-80.  Same goes for the air filter housing which is the correct match for the 79 flat top carbs.

[clonmore1]

Continue to enjoy the bike, if it goes well for you, why worry?

As I keep reminding my lovely wife, size (in CC's of course[ch128526]) isn't everything...

[Tony Smith]

R65 would have a 31/9 (3.44) final drive matched with a 1276 speedo

Don't you mean 32:10 Barry?

[Barry]

Don't you mean 32:10 Barry?  

There were at least 2 maybe 3 different ratio's used over the years on R65's including I guess 32/10.  For the early model both the BMW workshop manual and the riders handbook I looked at listed the drive ratio as 31/9. Whether every smooth case final drive on an R65 was 31/9 I don't know Tony.

[stubmw]

Bucher. Quote  Sounds great - can't wait to see it.
montmil.  Quote  Hello, Stu.
Welcome to the asylum. Post up some photos when you can. Us inmates love pictures!

How do i grab multiple quotes from a topic and repost them in the little grey boxes. I hit 'quote' and get a load of code with it.