Incorrect igniter assessment

[Motorcyclerider]

A while back I posted about installing a gpz900 igniter with excellent results. I’ve discovered the mistake that I’ve made. Original c10 igniter part numerous is 21119-1111 and the one I thought was an upgrade from a gpz900 was 21119-1110. It is not. I was looking through some threads last night and found that a gentleman from France has done some circuit board repairs to his gpz1000rx igniter and was very satisfied with the performance of that igniter. I had come to realize that I was incorrect about the part number from the c10 to the gpz igniter having any significant difference. However when I changed the original c10 igniter to the gpz900 igniter I did notice a significant performance increase. I removed the casing for the original igniter and inspected. The transformers appeared to have a been exposed to a high amount of heat. Before installing my coil on plug setup one of my caps had excessive resistance which I believe cause the igniter to malfunctions. I have plenty of oem c10 igniters and a gpz1000rx so I did some testing. The know good c10 igniter worked the same as the gpz900. Felt flat below 5k rpm but pulled hard to redline. The gpz1000rx gave the bike A noticeable increase in sharpness Al low rpm and seemed to take throttle easier. Although it didn’t rev quite as high about 10,000rpm. Something still felt a little off. A little flat. Like a cylinder down on power. Some of my connection for the free power mod had deteriorated. I repaired them with some very thick wiring. Also went through the carbs last night bench syncing them, lowering the needles, and setting the float heights. I had been wondering why my bike had been feeling a little flat like it had a bent rod or low compression but has all that tested and checked out. After repairing the free power mod the bike is a rocket. Not to mention I’m running ninja 1000 cams, modifier cam timing, gpz1100 36mm carbs with factory pro needles and 130 mains with a portion of the airbox closed off with foam thanks to Steve’s input. The only thing I’m a little disappointed in is the rev limited as I think the bike can pull a little further. Since I’m not going for the conventional torquey c10 my next move is to install a zl900 bevel drive to tighten the gear ratio in order to make it easier to keep the bike in the powerband. I’ve found a company that sell the gpz1000rx igniter with adjustable ignition table which could be interesting in the future. A little pricey though. However there are a few 21119-1164/1165 zx10/gpz1000rx igniters for sale on eBay for a reasonable price. Don’t worry about the extra pin I think it’s for a shift light. Hope someone finds this interesting.

 

[SethInIllinois]

Do these various bikes use the same coils?

If so, I wonder if the only real differences are the timing advance curve? I would expect those would be tuned differently between the ZG1000 and the more high-powerband GPZ/Ninjas.