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2/3 Coil only fires half the time!!! RESOLVED :)
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This happened the other day. I was riding my 82 kz 750 e and it was running fine. I took a break and went back out later and it was kind of hesitant (at constant rpm) as if it were running out of gas. While running today, I pulled off the #1 plug wire, and she stalled out. Did the same for #4, and no change at all...just kept running like I hadn't done anything. I pulled the spark plug, and checked connection to coils, etc. and everything seemed fine. Should I check the points? Would that only affect 1 specific cylinder?
Also, I'm thinking of upgrading coils, and plug wires while I'm fixing the issue. What ohm coils do I want (in the future, I will be making this a track bike)? Do I want suppression wires or copper core wires?
Thanks in advance,
Clutch
Southern Maryland, USA
1980 KZ250 LTD (traded, but still missed)
1982 KZ750 E3 (Cafe Project) (Dyna-S, Dyna Coils, V&H 4-1, K&N Pods, 6 Sigma Jet Kit, Acewell Computer, Woodcraft Clip-ons, Custom Rewire)
1966 A1 Samurai (Restoration Project)
Wish List:
KZ1000 P (For a "touring" bike)
Z1 (need I...
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Southern Maryland, USA
1980 KZ250 LTD (traded, but still missed)
1982 KZ750 E3 (Cafe Project) (Dyna-S, Dyna Coils, V&H 4-1, K&N Pods, 6 Sigma Jet Kit, Acewell Computer, Woodcraft Clip-ons, Custom Rewire)
1966 A1 Samurai (Restoration Project)
Wish List:
KZ1000 P (For a "touring" bike)
Z1 (need I...
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- Qdude
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Did you rest the connected plug on the head and check for spark? Or just give a look for damage or tampering?
The problem you described could likely be carb related (why would only one of two wires quit?).
Try switching the #1 and #4 plug wires to see if the non-firing cylinder changes as well. If the same cylinder is not firing, then rule out spark. Try switching the plug out for a known firing one. It might be a fouled plug.
How is the battery charge? Is the plug fouled, white, sooty black, or tan? Did you run really low on gas and suck some crap into the system?
Edit; Yes, you can run the stock coils.
77 KZ 650 C1.
77 KZ 650 C1.
Crashed-Repaired, Pods, Kerker pipe, re-wired core bundle, lamp upgraded, homemade rectifier, solid state regulator , Dyna-s ignition, repainted, slightly modified, year-round commuter
Honda Metro 85 mpg Scooter. Dont laugh I will throw it at you
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- clutch
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- I wish I had a tad more patience to do it better!
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Southern Maryland, USA
1980 KZ250 LTD (traded, but still missed)
1982 KZ750 E3 (Cafe Project) (Dyna-S, Dyna Coils, V&H 4-1, K&N Pods, 6 Sigma Jet Kit, Acewell Computer, Woodcraft Clip-ons, Custom Rewire)
1966 A1 Samurai (Restoration Project)
Wish List:
KZ1000 P (For a "touring" bike)
Z1 (need I...
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- I wish I had a tad more patience to do it better!
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- Thank you received: 12
Southern Maryland, USA
1980 KZ250 LTD (traded, but still missed)
1982 KZ750 E3 (Cafe Project) (Dyna-S, Dyna Coils, V&H 4-1, K&N Pods, 6 Sigma Jet Kit, Acewell Computer, Woodcraft Clip-ons, Custom Rewire)
1966 A1 Samurai (Restoration Project)
Wish List:
KZ1000 P (For a "touring" bike)
Z1 (need I...
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- TexasKZ
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If you just want to replace coils or wires, contact Z1E. If you want the whole Dyna system, Dyna's website can set you on the path to strong, if not cheap, fire.
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough
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TexasKZ wrote: bad secondary wire
Would this be the spark plug wire, or the wire that goes from the points to the coil?
Southern Maryland, USA
1980 KZ250 LTD (traded, but still missed)
1982 KZ750 E3 (Cafe Project) (Dyna-S, Dyna Coils, V&H 4-1, K&N Pods, 6 Sigma Jet Kit, Acewell Computer, Woodcraft Clip-ons, Custom Rewire)
1966 A1 Samurai (Restoration Project)
Wish List:
KZ1000 P (For a "touring" bike)
Z1 (need I...
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- Qdude
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That was why I sugessted you switch the 1 and 4 plug wires to see if the possible bad plug wire causes the intermittent spark. If it is the secondary/plug wire then the issue would switch cylinders with the plug wire switch. Mine are long enough to do it I hope that yours are long enough to do it as well. This test would tell you a lot.
If something got by the inline fuel filter then it could get into one of the carbs and cause an issue (inline fuel filters are not perfect. I had two in a row that allowed rust "dust" to pass and foul my passages. I now have my first Kreem lined fuel tank...) For instance, something could be lodged in the float bowl valve causing your #4 carb to flood constantly. It could be a faulty/float bowl valve that was on its way out and chose that time to go bad.
I would find a way to switch coils 1 & 4 with 2 & 3 or switch plug wires 1 with 4 to see if the problem stays with the cylinder or switches to follow that specific secondary/plug wire.
77 KZ 650 C1.
77 KZ 650 C1.
Crashed-Repaired, Pods, Kerker pipe, re-wired core bundle, lamp upgraded, homemade rectifier, solid state regulator , Dyna-s ignition, repainted, slightly modified, year-round commuter
Honda Metro 85 mpg Scooter. Dont laugh I will throw it at you
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Southern Maryland, USA
1980 KZ250 LTD (traded, but still missed)
1982 KZ750 E3 (Cafe Project) (Dyna-S, Dyna Coils, V&H 4-1, K&N Pods, 6 Sigma Jet Kit, Acewell Computer, Woodcraft Clip-ons, Custom Rewire)
1966 A1 Samurai (Restoration Project)
Wish List:
KZ1000 P (For a "touring" bike)
Z1 (need I...
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- Qdude
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And now I am curious what is going on with it.
77 KZ 650 C1.
77 KZ 650 C1.
Crashed-Repaired, Pods, Kerker pipe, re-wired core bundle, lamp upgraded, homemade rectifier, solid state regulator , Dyna-s ignition, repainted, slightly modified, year-round commuter
Honda Metro 85 mpg Scooter. Dont laugh I will throw it at you
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- steell
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We've covered the wasted spark ignition system on these bikes numerous times, so anyone that does not understand what it is and how it works should do a search for "wasted spark".
Point is, you pull the spark plug wire off a single cylinder, and do not ground that plug wire, you kill two cylinders, like 1&4 or 2&3. If you don't have spark on one cylinder of a pair, then you don't have spark on the other cylinder either.
It's all explained in the manual for each bike model.
You can however lose a cylinder, like flooding out the plug on one cylinder will still leave the other cylinder sparking, as in "Strong smell of gas at the exhaust". Piece of gunk could have broken lose inside the fuel line after the filter and be holding the float valve open (as an example).
KD9JUR
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steell wrote: If you don't have spark on one cylinder of a pair, then you don't have spark on the other cylinder either.
If this is true, shouldn't there be a noticeable difference pulling the #4 plug? When I pulled that wire, the bike ran more smoothly, not as if I had lost 2 cylinders, instead of just 1.
EDIT: Or maybe I'm mistaken, and It's actually #1 that's not firing, and the reason I notice the difference pulling #1 is because I'm killing #4 at the same time?
Southern Maryland, USA
1980 KZ250 LTD (traded, but still missed)
1982 KZ750 E3 (Cafe Project) (Dyna-S, Dyna Coils, V&H 4-1, K&N Pods, 6 Sigma Jet Kit, Acewell Computer, Woodcraft Clip-ons, Custom Rewire)
1966 A1 Samurai (Restoration Project)
Wish List:
KZ1000 P (For a "touring" bike)
Z1 (need I...
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