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Old 09-10-2012, 01:57 PM   #1
huronbikes OP
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GT/T500 ignition died. Any subs?

I was pondering over how to deal with a Suzuki GT500 and its dead CDI / PEI / Caveman Transistorized Ignition module. Has anyone tried using a GM HEI module to trigger the coils on that bike, or any other sort of devious hackish substitution?

If you guys haven't seen it before, http://home.comcast.net/~loudgpz/GPZ...ZgmHEImod.html demonstrates building an ignition for the GPz 4s and the 750 twins, though both are 4 strokes and I'm not exactly sure what factors need to be accounted for when trying to duplicate this for a two stroke.

Alternatively, is there an aftermarket option that doesn't cost a butt and a nut?
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Old 09-11-2012, 03:08 PM   #2
Twin-shocker
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Try a 6 pin pit bike CDI unit...........get the wiring right and it may well work. The 5 pin type work fine on AC CDI systems.
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Old 09-12-2012, 03:34 PM   #3
Andyinhilo
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Quote:
Originally Posted by huronbikes View Post
I was pondering over how to deal with a Suzuki GT500 and its dead CDI / PEI / Caveman Transistorized Ignition module. Has anyone tried using a GM HEI module to trigger the coils on that bike, or any other sort of devious hackish substitution?

If you guys haven't seen it before, http://home.comcast.net/~loudgpz/GPZweb/Ignition/GPZgmHEImod.html demonstrates building an ignition for the GPz 4s and the 750 twins, though both are 4 strokes and I'm not exactly sure what factors need to be accounted for when trying to duplicate this for a two stroke.

Alternatively, is there an aftermarket option that doesn't cost a butt and a nut?
The way i read it, it should work fine, one module per coil. The 4 cylinder setup would be the same since those bike are a wasted spark system (it fires at TDC every revolution).
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Old 09-13-2012, 08:26 AM   #4
stainlesscycle
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Originally Posted by Andyinhilo View Post
The way i read it, it should work fine, one module per coil. The 4 cylinder setup would be the same since those bike are a wasted spark system (it fires at TDC every revolution).
what about the timing curve? ....i would assume the t500 cdi retards timing at high rpm. the hei just keeps advancing.......... could be a recipe for disaster - you may be able to use just about any cdi that works off the same pickup style (inductive i assume?) there's lots of cheap ones out there that have no timing curve, which might work.... ebay dc cdi and you might find a $10 unit that will work. the moped guys do it... if you can find one with a 2 stroke curve that would be much better..
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Old 09-14-2012, 09:46 PM   #5
Tim McKittrick
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It looks like Boyer Bransden used to make an ignition for your bike but doesn't anymore- they still might be worth contacting for assistance:

http://www.boyerbransden.com/suzuki.html

I have also seen reports of folks using Powerdynamo with good results:

http://powerdynamo.biz/deu/systems/lists/suzuki.php

http://powerdynamo.biz/eng/systems/7201/72017main.htm

A little over $400
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Old 10-14-2012, 08:49 PM   #6
mach1charlie
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Hei

I did two HEIs on a kz1000, worked great
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Old 10-15-2012, 07:05 AM   #7
anotherguy
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Try Ignitech. Reasonable prices and good support even though it's a Czech company. Look at the CDI-P2 for your bike.
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Old 10-15-2012, 11:18 AM   #8
killfile
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Quote:
Originally Posted by Tim McKittrick View Post

I have also seen reports of folks using Powerdynamo with good results:

http://powerdynamo.biz/deu/systems/lists/suzuki.php

http://powerdynamo.biz/eng/systems/7201/72017main.htm

A little over $400
Powerdynamo is great because it replaces everything electrical for running, but the Czech craftsmanship leaves a LOT to be desired. My rotor didn't have anything that looked like a proper timing mark. Managed to get it running, but it confirmed my suspicions that there was no mark in that location!
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