Siebenrock 860 kit running hot

[Kelvin]

I've put 500km on my 1983 R65LS since installing the Siebenrock 860 kit. It seems to be running hot: up to 140 degrees C (280F) in ambient temperature of 27 C (80F). This normal highway speed around 100km/h (65mph) and solo.

Have other people had this sort of problem? Do people install oil coolers alongside the kit?

Thanks in advance

[Bob_Roller]

Is this oil temperature, or cylinder temperature ??

[Kelvin]

Oil temperature, measured using a dipstick thermometer. In the past it's only gone up above 130 on hot days (35 degrees) and extended running.

[Barry]

Have you checked ignition timing at full advance to make sure it isn't too retarded which causes overheating.  Does the increased bore warrant a little more advance than a stock R65 ?  I doubt a difference of 1 or 2 degrees would cause your overheating though.

[nhmaf]

Did they advise to make and adjustment on the carbs with the kit, such as moving a notch on the main jet needle?  Might be running a bit lean = hot ?

[Bob_Roller]

If you are considering the BMW OEM oil cooler kit .
The most costly part, the thermostatic bypass valve will not fit .
The right exhaust is in the way .
There was an OEM exhaust pipe that was bent to where it would clear, but the part is no longer available .
I'll go through the stack of paperwork I have for my bikes and see if I can find the installation instructions for the oil cooler, it has the part number on it.
There is an OEM part from the airhead GS model bikes that replaces the thermostatic valve.
So oil flows through the oil cooler all the time .
I have this kit on my '81 standard R65 I need to block off the airflow during cold weather.
Well at least what passes for winter here in Phoenix .

[Bob_Roller]

I did a little bit of searching for the installation instructions no luck I did this 28 years ago .
But what I did find, was the BMW part number for the oil cooler kit for airhead bikes .
Go to RealOEM and put 11421338771 in the part number search.
That's the part number for the cooler itself, the entire kit will come up.
I don't know if the kit is still available couldn't find a part number for it .
All the part numbers are shown, and again no idea if all of them are still available or how accurate the prices are .
Hope this may help you out !!
Looks like it will be costly .

[dogshome]

Hello, I've been running the 860 kit for a while in the UK. 27C is very hot here. 12C is more like what we have 

The bike will ping in midrange with 5% Ethanol "Super" fuel and standard timing over ~20C. I have Silent Hektik ignition, which can simply be dialled back 2 degrees without affecting idle. I doubt 2 degrees would affect idle though, so turn your bean can back a little 

When I say pinging, I mean 'growling', running hard. Not the traditional tinkling sound.


She won't be run-in at 500 clicks. I thought with the whizzo liners and piston coating it would be done in five minutes. No, probably nearer 1000 clicks. And yes you need dino oil or it will take even longer. Plenty of heat cycles, keep it spinning, any growling, back off!

[Kelvin]

Thanks for the suggestions, I'll monitor it for a few weeks, check the timing etc, and update. Maybe it will settle down during the run in period.

[Barry]

Would an aftermarket deeper sump be cheaper than an oil cooler. Not as effective but might make enough difference.

[Bob_Roller]

It would be less costly but it would make the center stand unusable .

[dogshome]

Hello Bob, depends which frame/year/bike and what sump. Extenders, maybe. 3.5L sump, no problemo 

[Bob_Roller]

Alright, good to know, the few larger capacity sumps that I have seen, stated that the center stand was unusable after the sump was installed .

[dogshome]

Moteren Israel

[Bob_Roller]

I went to the Motern Israel site, and it states that the upper most strut of the center stand has to removed or replaced .
Is this one of the crossover tubes on the center stand ??




https://www.motoren-israel.com/Shop/Oil-pan-a-accesories/Alu-Oil-pan-ca-3-5-l::201827.html