Motronic replacement

GLDelivery · 09-30-2003, 01:26 PM

Anyone out there ever have to replace their computer?Mine was giving poor acceleration, rough running in upper RPM's.Fuel mileage was OK though...we swapped it with another 1100S's that was in for service for unrelated work and mine took off.It ran upper rev range like starving for fuel,T/B's perfect synch, fuel filter new. Problem would come and go every few minutes...61,000miles

carlvk · 09-30-2003, 03:08 PM

I am sure that the one on my 02 prep was swapped out just before they sold it to me as it was there ex demo bike definitely was running rough when I rode it the first time better when came back and fine since i've owned it

pdonnell · 09-30-2003, 03:24 PM

Raven has been having prob's with his motronic box. Told me an OEM replacement was like $700 (ouch!!!)

CarlosT · 09-30-2003, 04:40 PM

I got an idea. We waste so much time trying to outguess the Motronic and this chip and that chip and this sensor and that O2 sensor and this regulator and pinging. Did anybody think of yanking the TBs and just sticking 2 Mikuni HSR42s and being done with all this bullsh it? I mean if I was up against an expensive Motronic swap, I'd seriously consider 2 Mikunis at $250 a piece new.

CarlosT · 09-30-2003, 04:40 PM

Heck the bike might even run better.

Raven · 09-30-2003, 05:05 PM

Nice dream and all about putting carbs on the bike but, the Motronic does more than control fuel.

The ECU (engine control unit, aka Motronic) controls spark as well as fuel. Try to retro fit points and stuff!!

Rough running in upper RPM's is what caused me to become concerned with what was happening with my bike, fuel mileage came up and confirmned that the problem was there all along with the ECU.

Lets not confuse things here! Poor mileage, rough running, and pinging can be caused by other things, like lack of maintenance or crappy gas.

As for price. pdonnel was wrong! He some how didn't get the 50 part. It is $750.00and it comes with a 1 year warrenty! Yea baby!

If anyone finds a good source on used ECUs let me know.

pdonnell · 09-30-2003, 05:17 PM

$1 for the Motronic, $749 for the warranty.

Raven · 09-30-2003, 06:59 PM

That explains it!!

CarlosT · 10-01-2003, 07:52 AM

Raven:
I was thinking of a hybrid system leaving the ECU in place to control timing. Yeah I know what you're gonna say...the ECU needs to know throtle position to change timing. Maybe this would be a easy add-on to a Mikuni. After all some Kawasaki carbs come with a throtle position sensor.

GLDelivery · 10-01-2003, 07:16 PM

Price was 650+- a few bucks new from BMW, none in North America , bought one from Cycles Recycled in NC for 300 bucks,off and running, I hope,,,,,

Raven · 10-01-2003, 07:37 PM

Quote:

Originally posted by GLDelivery
Price was 650+- a few bucks new from BMW, none in North America , bought one from Cycles Recycled in NC for 300 bucks,off and running, I hope,,,,,

Do they have another?

Turn me on to the info!!

Raven · 10-02-2003, 06:25 PM

Does any one else have info on used BMW parts?

motoman · motoman's Garage

Quote:

Originally posted by CarlosT
Did anybody think of yanking the TBs and just sticking 2 Mikuni HSR42s and being done with all this bullsh it?

You mean 'flood yer cylinders'?

Gee Carlos, that is SO old school....

I think there is a Buell group that might be interested in a solution like that... Can't think of the Sac, I mean Name right now...

Raven · 10-06-2003, 09:34 PM

Quote:

Originally posted by GLDelivery
Price was 650+- a few bucks new from BMW, none in North America , bought one from Cycles Recycled in NC for 300 bucks,off and running, I hope,,,,,

So what happened?

CarlosT · 10-07-2003, 08:14 AM

Old school is good

All this Motronic stuff is very complicated for as primitive as it is.

GLDelivery · 10-08-2003, 05:09 PM

installed used motronic ....bike is a screamer again....revs easily to 7500 with no hesitation...idles great....leaving in the AM for Boston area(Lars Anderson european MC Day)