Carb Rebuild And Parts

[mrclubike]

Before you remove the jet needles measure how far they are sticking out

To remove them you twist them 90deg back and forth as you GENTLY pull them out

It is amazing how little wear in the jet and on the needle effects mixture

[Tony Smith]

It is amazing how little wear in the jet and on the needle effects mixture

Amen to that.
And it sometimes so bloody difficult to convince people that is their problem.

[BPT]

Thanks again. Any and all tips and tricks are appreciated.

[Bob_Roller]

Finally have time to post the various parts for your 64/32/335 - 336 carbs .

Main jet : 138
Needle jet : 2.64
Jet needle : 2.51
Atomizer : 591
Idle jet : 45


Also removing the needle from the slide, there are two versions as has been mentined .

My '81 R65, has the older version, a spring clip in the slide, twist and pull the needle out .

The later version, has a metal threaded ' plug ', you put a regular screwdriver down the top of the slide and remove the plug, then the needle comes out, there is  clip on the needle that you set to the third position from the bottom .

Both of my LS's have this version on the 64/32/335 - 336 carbs .

[BPT]

Thanks Bob. That'll save me a lot of time deciphering things.  I can't remember what piece it was that I saw the split year for but now I'm wondering if it was the needle you're talking about with two different versions. 

When you say your 81 has the earlier version, are the carb numbers the same?

[Bob_Roller]

No, the '81 has 64/32/325 - 326 carbs .

[BPT]

Ok, thanks. I was just wondering if I might need to plan for a surprise when I open them up.  I'd hate to get stuck because I have one piece wrong.

[tunnelrider]

I've just overhauled my carbs, so while it's fresh in my memory I recommend:

If the bike is running, spray some brake cleaner at the throttle shaft on the engine side, if there's no increase in revs you can save some time and not bother dissembling the throttle shaft as I found those o-rings were still in top shape (replaced anyway while I was there) and I've read a couple of times that these o-rings last a long time.
 Still check that the butterfly valve is on the correct way though, see this link by Snowbum which has photos of how it should be (and it's good to read through before you start) -
http://bmwmotorcycletech.info/bingcv.htm

Try and loosen the two carb top screws and four choke body screws on each carb first before the final order of parts - you may have a seized screw that is or ends up unusable again.

The five (each side) o-rings are: largest on the venturi, second largest on the throttle shaft, third largest on the choke shaft and the two smallest o rings are for the idle jet and idle mix screw.

I think you've got the Clymer manual - use that to find the order of doing things, it's pretty clear.

You can expect to take at least a day to take the carbs off, pull them apart (I recommend doing one at a time so you don't mix up parts), clean everything, put them back together and put them back on the bike.

Have a couple of cooling beverages after cleaning the parts, this is the most time consuming part. Assembling the carbs is pretty straightforward and by far the most fun part!

[BPT]

Thanks Tunnelrider.  I'm going to order parts in the next day or so.  Then I'll be tearing into these.  Ugh.