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81
BMW Technical Q&A, Primarily R65 / Re: disassembling the drive shaft
« Last post by Steve on April 01, 2026, 09:00:00 AM »
Since the '79 R65 torsion-dampered drive shaft doesn't have the longitudinal groove, the snap ring is hard but possible to get off. When done inspecting the drive shaft I bought a new ring and recompressed the drive shaft but I couldn't get the ring on. So I bought a set of 300 snap rings in all sizes from Harbor Freight costing $6. One was just the right size. These snap rings have the little ears with holes in them so they are easy to put on and off with snap ring pliers, also cheap at HF.
82
BMW Technical Q&A, Primarily R65 / Re: Clutch Issue
« Last post by dogshome on March 29, 2026, 07:57:33 AM »
Mine had a dry mix of red and black rust/cement, instead of a needle bearing  ;D
83
BMW Technical Q&A, Primarily R65 / Re: Siebenrock 860
« Last post by dogshome on March 29, 2026, 07:53:31 AM »
 :lurker: :lurker: :lurker:
84
BMW Technical Q&A, Primarily R65 / Re: Battery for '79 R65 (AGM)
« Last post by TomHoldom on March 28, 2026, 11:29:08 AM »
Thanks for the help
85
BMW Technical Q&A, Primarily R65 / Re: Battery for '79 R65 (AGM)
« Last post by Barry on March 28, 2026, 11:26:33 AM »
Another vote for generic AGM's. My first one cost GBP32 and  lasted almost 11.5 years. I recently replaced it with another very similar battery for GBP35.

PC680's are great batteries but at GBP140 in the UK they they make no economic sense at all compared to a generic AGM.

That's strange, I type pounds signs and it displays pounds signs until it's saved and posted when they then turn in to ? marks.  So I've used GBP instead
86
BMW Technical Q&A, Primarily R65 / Re: Battery for '79 R65 (AGM)
« Last post by Tiedie on March 27, 2026, 05:48:27 PM »
Quote from: Bob_Roller on March 27, 2026, 02:07:38 PM
That's not a bad price .
I have been using generic agm batteries for 25 years .
I live in a low desert and batteries last at best 3 years .
Do an online search for agm motorcycle battery 12 volt 22 ah and see what you come up with .
There are 18 and 20 ah batteries available I've been using the higher ah batteries they seem to last a little bit longer than the 18 ah batteries .
See if you can do better on the price shipping costs may outweigh the savings .
Also I would recommend using a battery tender if the bike isn't ridden often .
Get a quality tender I went cheap and had early battery failure .
I'm sold on Battery Tender brand, they have the Junior Tender 750, 800 ma and 1 amp tenders .
Quote from: TomHoldom on March 27, 2026, 04:15:01 AM
Hello,
I'm looking for help recommendation for an AGM battery for my occasionally used 1979 R65
My old AGM battery is dead (after forgetting to leave on trickle charge of winter)

I have seen an Exide AGM12-18 (12V, 18Ah, 250A) recommended which is available where I am (france) for ?65.
Does this look ok? After the size and quality is it only the 12V and 18Ah that I need to check when choosing ?
Thanks for your help.
Tom

Ive had excellent success with the Odyssey PC680 for the last 15 years or more. As Bob mentioned Battery Tender brand is excellent been usins one for 30 years or more and upgraded to a 4 bank to run the lawn tractor, the LS and my Kubota B7100 tractor. Have one in the garage for my generac generator too.

When everything gets put up for the winter I plug up and it maintains.
Oddyssey owns X2 power batteries by the way.
87
BMW Technical Q&A, Primarily R65 / Re: missing at higer speeds
« Last post by Happy Eeyore on March 27, 2026, 05:38:41 PM »
Bob, no rust showing in the tank.  The crud on the screens was rust looking but it was some very small paint flakes I think.  Gooey crud is the official analysis.  The crud was about halfway up the pipe which was why the miss would come and go depending on the gas level.   There were two screens , one large one covered the two straws in the tank and  there was one downstream of the valve stuck up inside and it had to be hooked with a dental pick to pull it out.   Both were partlally covered with crud. . I have a small in line filter after the petcock and I have a new one coming but it looks clean. 

I read in Snowbum's complete history of western civilization that flow rates should be about 8 gals an hour.  I was less than half of that.    I had a DR650 and the first thing you do is take out the strainer because it always plugs.  But I did not even know the R65 had strainers until I took it apart. 

If the problem ever returns I will take out the strainers and just run with the in line filter.

Live and learn, then get old and forget then get to learn again. 





88
BMW Technical Q&A, Primarily R65 / Re: missing at higer speeds
« Last post by Tiedie on March 27, 2026, 05:32:20 PM »
Quote from: Happy Eeyore on March 27, 2026, 11:38:18 AM
I have chased this missing at high speed for a couple of weeks and thought I had solved it several different times.  Thought it was bad fuel.   Thought it was the bean can.  Well for certain it was starved for fuel.  I did a fuel flow and was getting about a gallon every 25 minutes which is way too low.  Today I drained the tank and took out the pet cock and cleaned the junk off the two screens and now she runs like a champ. Inside of the fuel tank looks very good.  Probably the first time the pet cock has been off.  So if you run into this problem check the fuel volume flow rate and save yourself the chase.
Quote from: Bob_Roller on March 27, 2026, 02:20:32 PM
Did you have flakes on tank liner in the filters?
Two of my LS's have a screen in the tank that goes over the tubes on the fuel tap .
That are available from after market parts sites .
I had high speed miss after installing an inline filter, too restrictive .

My plan is to check the screens or just replace the petcock one iI get the LS back from some maintance and the Siebenrock 860 kit install.
89
BMW Technical Q&A, Primarily R65 / Re: missing at higer speeds
« Last post by Bob_Roller on March 27, 2026, 02:20:32 PM »
Did you have flakes on tank liner in the filters?
Two of my LS's have a screen in the tank that goes over the tubes on the fuel tap .
That are available from after market parts sites .
I had high speed miss after installing an inline filter, too restrictive .
90
BMW Technical Q&A, Primarily R65 / Re: Battery for '79 R65 (AGM)
« Last post by Bob_Roller on March 27, 2026, 02:07:38 PM »
That's not a bad price .
I have been using generic agm batteries for 25 years .
I live in a low desert and batteries last at best 3 years .
Do an online search for agm motorcycle battery 12 volt 22 ah and see what you come up with .
There are 18 and 20 ah batteries available I've been using the higher ah batteries they seem to last a little bit longer than the 18 ah batteries .
See if you can do better on the price shipping costs may outweigh the savings .
Also I would recommend using a battery tender if the bike isn't ridden often .
Get a quality tender I went cheap and had early battery failure .
I'm sold on Battery Tender brand, they have the Junior Tender 750, 800 ma and 1 amp tenders .
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