cb900 f karput

[cb900fboy]

hi all am having trouble with my cb900 think its coil both 2&3 stop working after bike seems to warm up runs very well till then has any 1 had this problem before ande if so could you help me with some advice cheers cb900 boy

[davereid]

If you are losing a pair of cylinders, its likely a coil or coil wiring problem. Often one coil fires 2 cyls, wasting the spark on one of them as its on the ignition cycle. Check all wiring and earths carefully, but a new coil may be required.

[Bonez]

Another possiblity is that the cdi pickup or igniter unit have packed it in. Not that uncommon. Lots of usefull info here- http://www.cb1100f.net/

[R6_kid:Me]

wrap the plug leads in lots of electrical tape... see if it is the problem. The leads could be arc-ing if they are worn. Seen it twice, once on a kawasaki and once on a honda... both pre 1990 bikes though

[tri boy]

Try swapping 2/3 with 1/4 coil. This will help narrow the fault down to coils, leads, pick ups. Oh also drain the carbs. 2/3 may be carrying some water.
Good luck.

[cb900fboy]

does any 1 live in wellington that can help me with this coil thing i am lost
i live in upper hutt and would be very greatful for any help from any 1 that understands sparky side of things cheers trev