ukbandit
1st February 2016, 11:11
Hi all
Bike is a Suzuki Bandit 2001
Fault is weak spark on number 3 plug.
I had done some work on the carbs, cleaned and fitted new bowl seal but I also had the headlamp off to repair a couple of cracks. The bike was running ok Without the headlamp on, after putting the head lamp back and somehow getting the rats nest of a loom to fit in number 3 cylinder seemed to not be working, down pipe cool compared to the others.
I swapped plugs, removed headlamp as I thought trapped wire earthing or something but still the same. Then after a lot of pulling and twiddling it seemed to come right, went for a blast all seemed good.
A week later same issue not firing although there is a spark but possibly to weak to do its job.
Number 2 works great and as the coil supplies both 2-3 at the same time I wondered if it is possible to have 1 side of the coil to not function properly? As far as I can tell it appears as one coil not 2 seperate coils in one case? Is that the case?
Secondary ohms 37.4kohms between plug leads for the coil.
The reading for the other coil is 38.6kohms so they are both within range 30-40kohms
Now a crude test I did was to use a current detector what you would use to detect live wires in your house, this one is a little pencil type thing.
I ran the bike placed it near each lead 1-2-4 lit up like a Xmas tree and the clicks it makes were loud, on 3 the led barely lit up and no clicks? So it appears that there is less current in that lead? Hence the question about one side failing?
I assumed the primary is working as number 2 seems fine.
Any thoughts or ideas to try would be appreciated.
Cheers
Les
Bike is a Suzuki Bandit 2001
Fault is weak spark on number 3 plug.
I had done some work on the carbs, cleaned and fitted new bowl seal but I also had the headlamp off to repair a couple of cracks. The bike was running ok Without the headlamp on, after putting the head lamp back and somehow getting the rats nest of a loom to fit in number 3 cylinder seemed to not be working, down pipe cool compared to the others.
I swapped plugs, removed headlamp as I thought trapped wire earthing or something but still the same. Then after a lot of pulling and twiddling it seemed to come right, went for a blast all seemed good.
A week later same issue not firing although there is a spark but possibly to weak to do its job.
Number 2 works great and as the coil supplies both 2-3 at the same time I wondered if it is possible to have 1 side of the coil to not function properly? As far as I can tell it appears as one coil not 2 seperate coils in one case? Is that the case?
Secondary ohms 37.4kohms between plug leads for the coil.
The reading for the other coil is 38.6kohms so they are both within range 30-40kohms
Now a crude test I did was to use a current detector what you would use to detect live wires in your house, this one is a little pencil type thing.
I ran the bike placed it near each lead 1-2-4 lit up like a Xmas tree and the clicks it makes were loud, on 3 the led barely lit up and no clicks? So it appears that there is less current in that lead? Hence the question about one side failing?
I assumed the primary is working as number 2 seems fine.
Any thoughts or ideas to try would be appreciated.
Cheers
Les