[zx11smith]

Hey all,

I am having a hot start issue with my '93 ZX11 C model. I was going to replace the factory coils with aftermarket units from Nology or Dynatek. So I popped on here for some sort of reference, but found nothing. What I did stumble on was a post by Claude reffering to stick coils. A little google and I found some info. Looks like a good idea.

Where do I get the coils?

what needs to be done?

It looks as though it is just 4 coil on plug units wired to fire in pairs just like the factory coils, but I'm just guessing.

Any help would be great.

Thanks,
Kevin

 

[zaneyzrex]

i can tell ya its a very good mod and you can find ALOT of info over here www.zrxoa.org (same motor so prob. a plug and play and cant beat it for the price)

 

[kromdom]

just did this mod on my '96 zx-11. got the coils on ebay for under $40. will also need a harness (go to bigbikeworld and contact ZX10BUD who will fab/ship you one for cheap). good reading here: http://www.bigbikeworld.com/forum/forum_posts.asp?TID=21080&PN=1

 

[sakispap323]

just did this mod on my '96 zx-11. got the coils on ebay for under $40. will also need a harness (go to bigbikeworld and contact ZX10BUD who will fab/ship you one for cheap). good reading here: http://www.bigbikeworld.com/forum/forum_posts.asp?TID=21080&PN=1

bigbike is no longer there...any other way to get info???thanks

 

[Claude]

Some did got problem (I did) with stick coils and some didn't.
I was having a hot start problem on my 11D that had stick coils at the time. Just by reinstalling back OEM coils, the problem vanished forever.

 

[57x]

The math doesn't work. Even if the bike will run with them, you are running them at half the voltage because you have to share them between two cylinders (wasted spark), and they often overheat because you are firing them twice as often. At high RPM, this firing speed shortens the soak time and reduces the spark even further.

It's simple math, under Ohm's Law.

 

[92Ninjas]

The math doesn't work. Even if the bike will run with them, you are running them at half the voltage because you have to share them between two cylinders (wasted spark), and they often overheat because you are firing them twice as often. At high RPM, this firing speed shortens the soak time and reduces the spark even further.

It's simple math, under Ohm's Law.

Don't fix what isn't broken.

 

[Blainethemono]

I did the swap several years ago. Its BEEN GREAT. Starts quicker, idles better & the top of the engine is easier to access now.

 

[viktor92]

I did the conversion and it ran OK for about three years, until I've had hot start problems. It seemed that the start motor sucked all the current and the coils were left without spark, but with a little push of the bike, it started and ran without any problem. Anyway I've replaced again with the stock coils, and the problem instantly disappeared. I always think of trying again, but the engine runs perfect, and to be honest, at least in my case, I haven't noticed any appreciable difference with the stick coils (but they looks really cool )

 

[freund794]

I did this mod last summer because I found corrosion in some of the plug wires. I didn't want to try my chances with used wires, and I think the new ones were unavailable or unreasonably expensive. I had the hot start issue every time I got to operating temperature. Push starting or waiting for it to cool down was the only way to restart the engine after a stop. I routed the wires so the coil connectors were easily accessible without removing any body parts. I got the bike up to temp and tested the resistance of the coils in pairs immediately after shutoff. If memory serves my correctly, nominal room temperature resistance is supposed to be about 3.5 ohms for each pair of coils and they would test at about 4.2 ohms when warmed up. I think the mod would be much more effective with a higher success rate if it were used with a Dynatek system to allow the coils to be used as a full sequential system instead of batch fire. In case anyone was wondering what my solation was, I went back to the OE style system. I removed the wires from the coils and boots, then cleaned the contacts of the boots and coils with vinegar then brake clean. I bought about four feet of copper core spark plug wire and installed even length segments with just a bit of silicone between the insulation and the sockets to lubricate them for install and to seal them. If I keep the bike longer into the future and money becomes more plentiful, maybe I'll try to make the Dynatek idea work. If so, I'll let you fellas know. Also, thanks to everyone here for all the info. I've been lurking this forum for like 10 years and haven't had anything of value to write about until now. At least I hope this ramble was valuable to someone. 😅