trouble shooting ;-)

[guyom]

Hi Guys, question for you : i ran with my bike (R65 1981) and suddenly.... the engine starts to misfire, i mean the idle was ok (well the for problem) but since i started to accelerate... rattatatata tapouet pouet poufff... i can restart the bike a bit... but finished the run by pushing the bike :-) (nice bike to push by the way not too heavy ;-)).

So my guest is the ignition coils... is it possible that the coils shout down? other idea?

Other questions : no link with the first one : i found a grease pump on my garage. Does the R65 need grease somewhere?

Finally, i read that the weak point on BMW bike are the oil pump (a clapet on the oil pump) and the exhaust valves. Is it hard to change by yourself or a mechanic guy is required ?

Thanks for time

Guillaume

[Bob_Roller]

Do you have a black and gray ignition coil

It's a known problem with these bikes .

About the only thing you can grease on an R65, is the swing arm bearings .

[Barry]

For greasing it may depend on the year. My 79 has grease nipples on the gear shift lever pivot and on the clutch operating arm at the back of the gear box. Plus as Bob said the swinging arm for which you need a conical tip on the grease gun.

[guyom]

HI guys, thanks for answer.. indeed.. i have an interesting "Harley Davidson black ignition coil" on it so far from stock... i was on the bike when i bought it... so mystery. I will check it tonight.

Just to know for a 1981 June model, does the DYNATEK DYNA DC2-1 1.5 OHM BROWN COILS is a good option ?

Thanks for the grease.. i will check the swinging arm.

Guillaume

[Justin B.]

Yes, brown coil is fantastic!

[Tony Smith]

I am making the assumption that being a 1981 edition that you have a hall effect ignition system.

Are you really sure the coil is the problem? It may be a peripheral problem but not the immediate cause.

Sudden stops of a previously well running bike and then subsequent ability to run at low revs but not at high revs are symptomatic of a failed ICU.

The ICU (unless it is the very latest riveted model) should be removed every couple of years and the thermal transfer paste renewed.

The wrong coil will also cause premature failure of the ICU, I don't think the Dyna green coil is the correct resistance for the ICU. For an insomnia curing discussion of all things ignition it is worth reading snowbum on the topic.

[Justin B.]

I think the green is for the early points ignition and the brown for the 81 and later...

[nhmaf]

Yes, the green coil has slightly higher primary resistance, which wouldn't be a problem for the solid state ICU, just might have slightly less spark energy but should still run OK... but this Harley Davidson Black coil is an unknown entity.

[mrclubike]

I have not heard the oil pump being problematic as a mater of fact just the opposite is true
Generally they have very high oil pressure to the point that to high a viscosity oil can crush the oil filter

Yes the exhaust valves are problematic but that depends on how much you ride
Are they closing between oil changes (7500 KM)
  Not only do the valves  fail  the valve seats wear out also
You can remove and install the heads yourself
But the valves are  not something you can repair yourself
The heads  have  to be sent to a machine shop to be repaired   

Green (3 ohm)coil can be used with Points and either new or old style ICU

Brown (1.5 ohm)with both new and old ICU but  not with points

Blue (0.7 ohm) with only the newest style ICU

[Rob Valdez 79 R65]

To get to the oil pump, you have to remove the gearbox and clutch assembly.
Odds are, it is fine.  Most folks, if they are in there for a rear main seal r/r, will replace the o-ring on the oil pump cover.

At some point, if you keep this bike long enough, you will learn to do all of this.  Do you have the original tool kit and owner's manual?  BMW gives you a very good head start on ownership with these two items.  MUCH better than the competition.

edit: AH!  Clapet! I had to Google it.

Yes, there is a spring-loaded bypass valve in the oil filter compartment.  I have heard of the spring breaking, and the spring pieces can get into the works and really mess up your day.
Here is some discussion about it on Boxerworks forum:
http://forum.boxerworks.com/viewtopic.php?f=1&t=1046&p=12703&hilit=ball#p12703

and

http://forum.boxerworks.com/viewtopic.php?f=1&t=217&hilit=oil+pressure+spring

edit 2: if you have signs of oil weeping around the filter cover, DO NOT tighten the fasteners tighter!  You could easily strip the threads in the engine casting!
If you do have weeping, you might need to read this article about how not all oil filter canisters are installed to the same depth.
http://www.gunsmoke.com/motorcycling/r100rt/oilFilterCanister/index.html
The idea is to measure things, and amongst the paper gasket, metal washer and rubber o-ring, you can adjust to get just the right "crush" on the o-ring to make things tight.
In my case, all I had to do was quit using the paper gasket, and all was wonderful with the world, or at least, that small part of one motorcycle engine...

[guyom]

Hi Guys. Many thanks for the answer. i checked with a voltmeter yesterday evening from one cap of coil wire to the other and had 21,28 kOhms. so obviously, looks correct (should be between ~17000 to ~30000 ohms). So perhaps the ICU module.. but i do not knoww how to test it.

[guyom]

does anyone test this model:

https://www.euromotoelectrics.com/Ignition-Module-BMW-R-Airhead-12-14-2-325-284-p/ignmod-r284.htm

is it a good option to change the stock ICU ? and in complement to brown Dyna coils ?

Guyom.

[Justin B.]

It should be.  You can contact them to be 100% sure, he's one of the good guys!

[guyom]

So i contacted the guys and yes that works however he suggests to use the Blue Dyna coils DUAL TOWER IGNITION COIL, BLUE - 0.7 OHMS RESISTANCE / DYNATEK and not the brown one to have the same resistance as Bosch dual tower coil or the early gray version.  so technically Blue Coils and HEAVY DUTY IGNITION MODULE should work fine.

Guyom

[Justin B.]

Good to know.  As far as ignition modules I think you can go to a junk yard and grab one out of an old Volvo, same thing...