[Diy_efi] Early-mid 1990's Bosch BMW Motorcycle Motronic Info?

[Torbjörn Forsman]

Many systems from the mid 80's have a crankshaft sensor that gives just 
one or two impulses for each revolution to the ECU. Usually, that 
impulse is located 45 ? BTDC or something, i.e. slightly before the 
earliest possible ignition timing. I have no experience of Motronic 
systems before about 1987 but it is very likely that those earlier 
Motronic use the same signalling as Bosch's microprocessor controlled 
ignition systems of that age (for example, EZ-L and EZ-K).
One easy way to check if it really is a Motronic system is to read the 
Bosch part number of the ECU. If it begins with 0 261, then it is a 
Motronic system. Injection-only (Jetronic) systems begin with 0 280, and 
ignition-only (EZ-x) begin with 0 227.

Best regards

Torbj?rn Forsman

urq wrote:
> In the very late 1980's and early to mid-1990s BMW Motorcycles had what 
> they called a Motronic system on their 4-cylinder 4 valve motorcycles.  
> The reason I say "called Motronic" is that it appears to me that the 
> Hall Senders mounted to the crankshaft operate very much like points.  
> Does anyone out there have any information about this system ... basic 
> block diagram and such is all I'm looking for ... or can you point me to 
> somewhere I can get the info?
> 
> If someone here is in the know, I'm also interested in the evolution of 
> the system since then ... did they ever go to a more conventional system 
> that allowed better resolution of the crankshaft position?  K1200RS 
> perhaps?
> 
> TIA!
> Steve B
> San Jose, CA (USA)
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