OEM Black box alterations

[Cudabob]

   Steve Burgess wrote,

<color><param>7F00,0000,0000</param> 

> I have, against better advice, taken apart the hermetically sealed

> ignitor box on my yamaha motorcycle, looking for dip switches,

> potentiometers, or any secret method of altering the stock ignition

> timing. (I'm one of those people that if they say it can't be done,

> I've got to try it on my own and see if I can proove them wrong)

> 


</color>Great fun...always wanted to destroy....take apart that unit. :-)


My guess as to what the box contained was a R/C circuit that 
controlled the trigger point of the output circuit, yielding a fixed rate 
of advance. My thought was to add a pot in parallel with the timing 
resistor to change the advance curve.


I designed a circuit that was programmable, but my son add 
multispark as a additional requirement. There additional hardware 
exceeded the physical space available, so the project came to a 
halt.


Ultimately the plan is to FI the bike and handle the ignition with the 
ECU. Space is still a problem.


<color><param>7F00,0000,0000</param>> I tried to describe the circuit as best as I could, but I have drawn

> it out if anyone does'nt immediately recognise it's purpose, and

> want's or needs to see it, I can attach it to an email to that person,

> I don't want to upload pictures to the list, especially since it's not

> directly related to efi.

> 

</color>Send me the schematic...it may fit in to what I expected the box to 
look like.




<color><param>7F00,0000,0000</param>> Steve



<nofill>
CudaBob '65 - Angels Camp, Calif
CudaBob at workmail.com
http://www.goldrush.com/~rhuish/
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