Ignition Module

[genejohnson]

Has anyone ever heard of using GM HEI Ignition Modules to replace those in our bikes? I just ran across something that I downloaded at some time and forgot about. It uses two of the GM modules to replace the stock module. My computer skills are nil so i haven't taken time to learn how to add attachments yet but I will e-mail them to someone if they promise to put it on the Forum. Gene

[Steve]

Yes, I have seen it done by another forum member. It seemed to work well enough, but there were other problems with the bike, so it did not get used much.

You want to send them to me, I'll post it for you.

.

[BassCliff]

Hi,

To attach, embed, or link to pictures in your posts:

http://www.thegsresources.com/_forum...ad.php?t=94653 (found using the search feature)

or...

Posting Pictures To GSR (found on some guy's website).


Thank you for your indulgence,

BassCliff

[Steve]

OK, here are the pictures that Gene wanted posted:





.

[Steve]

Hi... Posting Pictures To GSR (found on some guy's website).

I don't know, Cliff, that "guy" sure seems to be copying a LOT of your stuff.



.

[derwood]

What bike? You do have a bike, right?
What about advance? HEI, relies on a mechanical spark advance?
I can see rigging up something to with a car module (and /or pick-up coil)to replace points type ignition.
but, with electronic ignition, if the ign timing is part of the oem module, how can you deal with advancing the spark with rpm?

[genejohnson]

I wasn't trying to convince anyone of its use! Only wondered if the forum was aware of it. To consider it, researching the author's write up (if it can be found) and methods he used would be in order. AND YES I have a 1980 GS850 thank you. Gene

[Nessism]

What bike? You do have a bike, right?
What about advance? HEI, relies on a mechanical spark advance?
I can see rigging up something to with a car module (and /or pick-up coil)to replace points type ignition.
but, with electronic ignition, if the ign timing is part of the oem module, how can you deal with advancing the spark with rpm?

Only some of the late model GS's have the advance curve built into the ignition module. There are many others that use a mechanical advance - so the HEI conversion could be used.

[genejohnson]

Thanks nessism for the reply. Just out of curiosity I have looked in the 1980 GS850 manual and it doesn't say it is mechanical or done in the module. The book tells you how to time the 79 which is points driven but doesn't mention timing on the 80. If timing is done in the module, wonder if the mechanical advance mechanism from a 79 could be adapted to work with the module. (interfere with the module timing?) I have no intention of doing any of this but curious. For some reason, I'm always thinking outside the box. Gene

[Nessism]

Thanks nessism for the reply. Just out of curiosity I have looked in the 1980 GS850 manual and it doesn't say it is mechanical or done in the module. The book tells you how to time the 79 which is points driven but doesn't mention timing on the 80. If timing is done in the module, wonder if the mechanical advance mechanism from a 79 could be adapted to work with the module. (interfere with the module timing?) I have no intention of doing any of this but curious. For some reason, I'm always thinking outside the box. Gene

Gene,

If you go to Alpha-Sports or one of the other on-line parts fishes you can look up what parts the bike has and you can compare between different models to see what interchanges by comparing part numbers (you need to check all the numbers within each supercession chain).

To answer your question, the 80-81 850 have an ignitor with mechanical advance. Some people have fixed their 82+ bikes by retrofitting an early mechanical advance along with a Dyna S unit.

[genejohnson]

Thanks again nessism, I really appreciate your insight and knowledge. Gene

[mbwjr12]

Matchless has a proper wiring diagram for using HEI modules with GS series bikes. I recently built my own ignitor using his design, and am just waiting for my new dyna coils to install it. With his permission I will post the schematic and a picture of my unit, and I will let you all know how the system works out on my bike.

[genejohnson]

That would be great mbwjr12. I look forward to seeing it. Gene

[Matchless]

Hi,
Have a browse here: http://www.mediafire.com/?sharekey=3...17b31bfbde8fc1

The HEI module is not my own, but was figured out by Lou for me. I did the some functional tests and it seemed to work well.

Enjoy!

[genejohnson]

Thanks matchless, I see there is a few changes from the schematic that I have for the Kawasaki 550. Did you ever have any success with it? If it proves to be worthy it could save folks some coins if their module goes kaput. I also ran across an article about using The Ford Duraspark module in the same manner (although its a bit larger). With the prices the Japanese charge for replacement parts, suitable substitutes would be worthwhile. I don't know the cost but I have heard that there are auto coils of the correct impedence (dual output types) that can also be utilized. I would guess that a lot of things that could be switched. Gene