GSX1100ES ignition

[Andries]

I got no ignition to number 3&4 cylinders any help would be appreciated 

[TonyGee]

have you tried 2 NEW spark plugs first ? 

[Andries]

Yes brand new fitted was ok but had the odd mis fire 

[Mike711]

Have you got sparks to 1&2 but not 3&4? 

[slayer61]

Weird as fuck....

 

1 coil drives plugs 1 & 4 and the other coil drives plugs 2 & 3

 

Never mind...   you guys know that.... I'm preaching to the choir. 

[TonyGee]

7 hours ago, Andries said:

Yes brand new fitted was ok but had the odd mis fire 

if it was running ok when you put the plugs in then a miss fire started it could be fuel, where the plugs wet ? fuel can kill plugs but trying another 2 known good plugs might be worth trying.

[denisd]

Are the plug leads from the coils going to the correct plugs? 

[Neil-IOM]

have you checked for 12v supply at the coils , ive more than once had broken wires in the harness?

 

[TonyGee]

2 hours ago, Neil-IOM said:

have you checked for 12v supply at the coils , ive more than once had broken wires in the harness?

 

he has 12v supply as he's got a spark on 1 & 2  

[Neil-IOM]

but he may not have a 12v supply to 3&4 

[TonyGee]

2 hours ago, Neil-IOM said:

but he may not have a 12v supply to 3&4 

???????????     

if you have 12v to the left coil which 1 & 4  and number 1 is sparking then it has a 12v supply,  same setup to the other side. 

[Neil-IOM]

Unless im having a brain fart each coil has a separate 12v supply 

[TonyGee]

1 hour ago, Neil-IOM said:

Unless im having a brain fart each coil has a separate 12v supply 

yes both coils have a separate 12v supply as it splits off from the kill/ignition switches.   so if 1 & 2 plugs have a spark then both coils have a 12v supply.  

[stockcar]

They are 2x seperate coils and hence connections and so the spark on 1x side doesn't actually guarantee the 2nd coil has a 12v connection.......

[TonyGee]

1 hour ago, stockcar said:

They are 2x seperate coils and hence connections and so the spark on 1x side doesn't actually guarantee the 2nd coil has a 12v connection.......

but the O/P says he's lost spark on 3 & 4 plugs. so if their is a spark on 1 & 2 then both coils have a 12v supply.  

one coil supplies cylinders 1 & 4.  the other coil supplies cylinder 2 & 3.  

[Gixer1460]

4 minutes ago, TonyGee said:

but the O/P says he's lost spark on 3 & 4 plugs. so if their is a spark on 1 & 2 then both coils have a 12v supply.  

one coil supplies cylinders 1 & 4.  the other coil supplies cylinder 2 & 3.  

At last someone has stated the obvious ! ! !  With a 3 & 4 spark problem it can't be coils! It can be leads / plug caps or plugs. This of course assuming the OP isn't trying to run 1 & 2 off one coil and 3 & 4 off the other DOH!

[Captain Chaos]

13 minutes ago, Gixer1460 said:

OP isn't trying to run 1 & 2 off one coil and 3 & 4 off the other DOH!

Usually this is the problem with above symptoms.

Or swapped 3 and 4 plug leads.

Edited January 9, 2022 by Captain Chaos

[TonyGee]

2 minutes ago, Gixer1460 said:

At last someone has stated the obvious ! ! !  With a 3 & 4 spark problem it can't be coils! It can be leads / plug caps or plugs. This of course assuming the OP isn't trying to run 1 & 2 off one coil and 3 & 4 off the other DOH!

my mistake, i just assumed everyone knows how they work  

[Gixer1460]

1 minute ago, TonyGee said:

my mistake, i just assumed everyone knows how they work  

Don't apologise - some obviously don't. Assumption is the mother of all fuck-up's!

[stockcar]

Yes assumed it was a pair run off one coil instead or reading it.......