Z1OwnersClub GB

Took my Lawson out for it's 1st run since rebuild at the weekend. Apart from a huge oil leak around the rocker cover everything seemed fine until about a mile down the road I started to run on only 2 cylinders. Pulling off plug leads it appears that it is only running on 2 and 3 cylinders so I suspect a duff coil.

How do I check if this is the issue? If it needs replacing what should I go for? Engine is 1260 Unitrack with 36mm flatslides and gas flowed head. Runs standard CDI ignition. It has Accel coils fitted. Should I go for Dyna coils and if so which ones are correct resistance? Should I replace complete ignition whilst I am at it? Don't think there is anything wrong with standard ignition as bike was starting on the button.

2.2 ohm Dyna's (grey) will be fine with std ignition (and of course Dyna S)

Wow Mark! That was fast

How do i check the old coils first though? Don't want to bin something to find issue is elsewhere.

martinz1000r
PostPosted: Tue Sep 01, 2009 7:16 pm Post subject:
Wow Mark! That was fast Very Happy

How do i check the old coils first though? Don't want to bin something to find issue is elsewhere.

A basic test;
Leave coils in place.
Swap signal wire from left coil to right coil and vice versa.
Swap ht lead #1 to cyl #2 & VV and then ht lead #3 to cyl #4 & VV
Start engine if missing sparks transpose to 2 and 3 cylinders; (ie. it starts on 1 and 4 only)
then the left hand coil is dead.
If not then you have an issue elsewhere.

Think that's right.


AL

Hello MartinZ1000R, if you are going to replace the coils you need 2.2ohm coils not 3 ohms coils (2.2 are the grey ones, 3 are green) the cdi should not be run with 3 ohm coils, I think the accel where normally 5 ohm (yellow) but not sure on the ohms rating for accel so check this out. Regards, Steve

I recently had a faulty coil.
The good thing is they are both not likely to become unserviceable at once. Meaning you can compare the ohm reading of the primary and secondary windings on each coil.
The bad thing is, they can breakdown under load. Meaning you can check them and they both will read the same, however, on the road operating they perform differently. This will also mean sporatic performance.. hard to diagnose.
I was lucky in my diagnosis.
I found I had a reading of resistance from the primary to the secondary. This windings reading should read "open circuit". Meaning a breakdown in insulation between those two windings.
RegardZ.