Factory plug and boot resistance
- GrumpierGrunt
-
Topic Author
- Offline
- User
- Posts: 24
- Thanks: 6
Factory plug and boot resistance
26 Sep 2024 07:45
Hi everyone! I am working on a ‘85 Kawasaki 750 Turbo that won’t idle, it’ll start and run for a couple seconds but then die out. Progressive attempts to start the bike result it in not running at all. Seems to only run with the starter button engaged. I have no throttle response and throttle has no effect.
This was a project that was supposed to be limited to a quick cosmetic upgrade that quickly evolved into a engine out project, not for mechanical reasons but because I wanted to powder coat the frame and other bits.
I’m ready to fire the parts cannon, but started to focus on anything and everything I might have changed. One item I changed were the coils. I should have left the dyna coils on, but was able to get a set of NOS coils for free from a friend. I picked up stock boots as well and a set of plugs (BR9ES).
I wonder if my issue is related to too much resistance in the boot, as it is a stock resistor type, coupled with the resistor in the plugs. I am not sure what type of wires came stick with this bike, but why would Kawasaki from the factory recommend resistor plugs and resistor caps?
it seems to be a big no-no from what I’ve read.
This was a project that was supposed to be limited to a quick cosmetic upgrade that quickly evolved into a engine out project, not for mechanical reasons but because I wanted to powder coat the frame and other bits.
I’m ready to fire the parts cannon, but started to focus on anything and everything I might have changed. One item I changed were the coils. I should have left the dyna coils on, but was able to get a set of NOS coils for free from a friend. I picked up stock boots as well and a set of plugs (BR9ES).
I wonder if my issue is related to too much resistance in the boot, as it is a stock resistor type, coupled with the resistor in the plugs. I am not sure what type of wires came stick with this bike, but why would Kawasaki from the factory recommend resistor plugs and resistor caps?
it seems to be a big no-no from what I’ve read.
Please Log in or Create an account to join the conversation.
- Wookie58
-
- Offline
- Moderator
- Posts: 4555
- Thanks: 2699
Re: Factory plug and boot resistance
26 Sep 2024 07:50
Resistor plugs and caps will give you a weak spark, I would suggest before you delve too deeply into the issue you have replace the plugs with "non-resistor" type and see how you go. If that doesn't sort it then I can help you with electrical testing of the fuel and ignition system
1982 KZ1000 Ltd
www.kzrider.com/forum/11-projects/617631...-82-begins?start=192
kzrider.com/filebase-alias?view=download...d-fault-diagnosis&ca
www.kzrider.com/forum/11-projects/617631...-82-begins?start=192
kzrider.com/filebase-alias?view=download...d-fault-diagnosis&ca
Please Log in or Create an account to join the conversation.
- SWest
-
- Offline
- Sustaining Member
- 10 22 2014
- Posts: 23256
- Thanks: 2840
Re: Factory plug and boot resistance
26 Sep 2024 08:09
And put the dyna coils back on. What color are they?
Z1b1000 1975 Z1b
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229
Please Log in or Create an account to join the conversation.
- GrumpierGrunt
-
Topic Author
- Offline
- User
- Posts: 24
- Thanks: 6
Re: Factory plug and boot resistance
26 Sep 2024 11:00
Thanks everyone!
The coils preciously on the bike were gray dyna coils.
I forgot to mention that I’ve tested ECU, fuel pump relay, and IC igniter on a working bike and they were fine. Also, I’ve done the tests per the supplemental manual and they’ve checked out fine. Computer is throwing no codes and TPS is responsive.
i tested the magnetic ignition pickups and the resistance was within spec and the coil primaries seemed fine. I used a heat gun to test the pickups but not the coils, so I might check that.
also, I tested compression and it was okay-ish. 145/145/145 and 120. C4 seemed low as Kawasaki says that any cylinder with a 14 psi difference is suspect, but I think it’ll come around with proper running.
it shouldn’t cause the problem I’m currently experiencing.
The coils preciously on the bike were gray dyna coils.
I forgot to mention that I’ve tested ECU, fuel pump relay, and IC igniter on a working bike and they were fine. Also, I’ve done the tests per the supplemental manual and they’ve checked out fine. Computer is throwing no codes and TPS is responsive.
i tested the magnetic ignition pickups and the resistance was within spec and the coil primaries seemed fine. I used a heat gun to test the pickups but not the coils, so I might check that.
also, I tested compression and it was okay-ish. 145/145/145 and 120. C4 seemed low as Kawasaki says that any cylinder with a 14 psi difference is suspect, but I think it’ll come around with proper running.
it shouldn’t cause the problem I’m currently experiencing.
Please Log in or Create an account to join the conversation.