cylinder 3+4 not firing
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- pierce
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cylinder 3+4 not firing
Before I get any further, I'm running an 86 engine with CDI (black box) in my 76.
My problem is that it is only running on cylinders 1+2.
I am aware that the right coil fires cylinders 1+2, so I replaced my coils with dyna. Much better spark, but still nothing. So I then replaced the black box. Still nothing on 3+4.
Looking for more input from wing gurus to solve the issue.
Ordered pulse generator (luckily they are in the front on an 86), but if that doesn't work I'm all out of ideas.
Anyone have any input or am I missing anything?
My bike has been running perfect until the other day when it just died and I couldn't get it started.
Thanks in advance!
My problem is that it is only running on cylinders 1+2.
I am aware that the right coil fires cylinders 1+2, so I replaced my coils with dyna. Much better spark, but still nothing. So I then replaced the black box. Still nothing on 3+4.
Looking for more input from wing gurus to solve the issue.
Ordered pulse generator (luckily they are in the front on an 86), but if that doesn't work I'm all out of ideas.
Anyone have any input or am I missing anything?
My bike has been running perfect until the other day when it just died and I couldn't get it started.
Thanks in advance!
1976 GL1000
1978 Gl1000
1978 Gl1000
- wingrider
- SUPER BIKER!!!!
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Re: cylinder 3+4 not firing
So, you are saying you don’t have any spark on 3-4? I would see what the new pulse generator does for you.
2002 1800 Wing
2001 Valkyrie Interstate
1978 1200 EFI Wing with Motorvation Coupe Royale sidecar
1977 1200 Wing cafe/bobber project
1974 Suzuki GT550
2001 Valkyrie Interstate
1978 1200 EFI Wing with Motorvation Coupe Royale sidecar
1977 1200 Wing cafe/bobber project
1974 Suzuki GT550
- pierce
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Re: cylinder 3+4 not firing
Thanks so much for the reply.
Yes, no spark at all. I can get it to run roughly. When I pull either of the front plugs I can visibly see a very strong spark and it struggles to stay running. When I pull either of the rear plugs, nothing.
Yes, no spark at all. I can get it to run roughly. When I pull either of the front plugs I can visibly see a very strong spark and it struggles to stay running. When I pull either of the rear plugs, nothing.
1976 GL1000
1978 Gl1000
1978 Gl1000
- wingrider
- SUPER BIKER!!!!
- Posts: 3724
- Joined: Thu May 24, 2012 12:15 pm
- Location: Maple Lake, MN USA
Re: cylinder 3+4 not firing
I would replace the pulse generators…seems to me there was one for each bank.
2002 1800 Wing
2001 Valkyrie Interstate
1978 1200 EFI Wing with Motorvation Coupe Royale sidecar
1977 1200 Wing cafe/bobber project
1974 Suzuki GT550
2001 Valkyrie Interstate
1978 1200 EFI Wing with Motorvation Coupe Royale sidecar
1977 1200 Wing cafe/bobber project
1974 Suzuki GT550
- ericheath
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Re: cylinder 3+4 not firing
Possibly the pulse generator has moved too far to function? I think there are two bolts holding each one. 0.16” to 0.040” air gap for the 84 model which is the manual I have. You’ll find out when me pulse generator comes. Not much room with the radiator in there, but pull the covers and you could probably see each one. There is also a bracket which holds the wire loom against the motor which if loose would allow the wires to contact the belts or crank pulley.
Whatever I suggest here should be given ample time for a moderator to delicately correct. I apologize in advance.
77 WING, 1200 engine with 77 heads, cams, gl1100 foot pegs, Magna V65 front end, 764A carbs, [-gone Suzuki M109 monoshock--, replaced with gl1100 shocks] gl 1200 swing arm, gl1500 final drive, wheel and rear brakes Valkyrie seat, Meanstreak tank, Sportster pipes, Power Arc ignition off crank.
77 Wing. black
83 Wing, in pieces
"Continuing education is important even if the subject matter is fairly useless (as in this case)."---Greg Foresi
77 WING, 1200 engine with 77 heads, cams, gl1100 foot pegs, Magna V65 front end, 764A carbs, [-gone Suzuki M109 monoshock--, replaced with gl1100 shocks] gl 1200 swing arm, gl1500 final drive, wheel and rear brakes Valkyrie seat, Meanstreak tank, Sportster pipes, Power Arc ignition off crank.
77 Wing. black
83 Wing, in pieces
"Continuing education is important even if the subject matter is fairly useless (as in this case)."---Greg Foresi
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Re: cylinder 3+4 not firing
I bought PGs from Honda a couple of years ago for an 85, which has them on the front. They come as an assembly for both sides. There's no adjustment--tighten the mounting bolts, run the wires, and they're installed.
BTW, the signal for the tach comes off the trigger for the 1/2 coil, and the fuel pump relay trigger is off the 3/4 set. Have you noticed if either of those is flaky?
BTW, the signal for the tach comes off the trigger for the 1/2 coil, and the fuel pump relay trigger is off the 3/4 set. Have you noticed if either of those is flaky?
- pierce
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Re: cylinder 3+4 not firing
Unfortunate, or fortunate, I'm running the motor on a 76. This means it's not connected to either the fuel pump or tachometer. In fact, I just deleted the tach.Shadowjack wrote: ↑Thu Oct 14, 2021 8:38 am I bought PGs from Honda a couple of years ago for an 85, which has them on the front. They come as an assembly for both sides. There's no adjustment--tighten the mounting bolts, run the wires, and they're installed.
BTW, the signal for the tach comes off the trigger for the 1/2 coil, and the fuel pump relay trigger is off the 3/4 set. Have you noticed if either of those is flaky?
1976 GL1000
1978 Gl1000
1978 Gl1000
- pierce
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Re: cylinder 3+4 not firing
Installed new pulse generator. It did nothing.
Front two wires are firing, but rear two have no spark.
I tested each connection going to the coil and I get full voltage, 12/13 with ignition on, and 14 when running. Same with both coils.
Any ideas what to look for now?
Front two wires are firing, but rear two have no spark.
I tested each connection going to the coil and I get full voltage, 12/13 with ignition on, and 14 when running. Same with both coils.
Any ideas what to look for now?
1976 GL1000
1978 Gl1000
1978 Gl1000
- BlueThunder
- Platinum Member
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Re: cylinder 3+4 not firing
Have you done the obvious? Replaced spark wires? Caps? Plugs? Made sure coil wires were getting power? Made sure no grounding issues with coil/pulser for 3/4?
...Brian
2014 CTX1300 Deluxe - BlackThunder aka Predator
1977 GL1000 - Ox
2014 CTX1300 Deluxe - BlackThunder aka Predator
1977 GL1000 - Ox
- pierce
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Re: cylinder 3+4 not firing
Figured it out. One small bit of wiring went bad. I put in some new wire, and all cylinders are firing.
and here are some sexy pics of my new seat:
and here are some sexy pics of my new seat:
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1976 GL1000
1978 Gl1000
1978 Gl1000
- Rat
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Re: cylinder 3+4 not firing
I think I’ve bought bikes for less than that seat cost ...
Gord(but they are the best)Jones
Gord(but they are the best)Jones
"I'd rather Ride than Shine"
‘14 KLR650 ... not a rat ... yet
‘84 GL1200i ‘R2B6' (Rat to Be 6, the last, adopted by twowings)
My Original 'RAT' was a hybrid '82 CB900/1100F
‘14 KLR650 ... not a rat ... yet
‘84 GL1200i ‘R2B6' (Rat to Be 6, the last, adopted by twowings)
My Original 'RAT' was a hybrid '82 CB900/1100F
- wingrider
- SUPER BIKER!!!!
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Re: cylinder 3+4 not firing
Where was the bad wire? Glad you found the issue, but also sorry you had to throw some parts at it.
2002 1800 Wing
2001 Valkyrie Interstate
1978 1200 EFI Wing with Motorvation Coupe Royale sidecar
1977 1200 Wing cafe/bobber project
1974 Suzuki GT550
2001 Valkyrie Interstate
1978 1200 EFI Wing with Motorvation Coupe Royale sidecar
1977 1200 Wing cafe/bobber project
1974 Suzuki GT550
- pierce
- Run Executive
- Posts: 1288
- Joined: Sat Dec 03, 2011 3:07 pm
- My Album: pierce
- Location: Madison
- pierce
- Run Executive
- Posts: 1288
- Joined: Sat Dec 03, 2011 3:07 pm
- My Album: pierce
- Location: Madison
Re: cylinder 3+4 not firing
This wire was coming out of the black box(cdi) and feeds into the left coil.
When I converted the 1000 to use the 1200 black box I had to rewrite the coils.
1976 GL1000
1978 Gl1000
1978 Gl1000
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