NC30 Problems with Cylinder No's 2 & 3

[davidc]

My bike starts but is not running properly on cylinders 2 & 3 - have sprayed WD40 on the down pipes for these two cylinders and they're definitely not at the same temperature (they're colder) than cylinders 1 & 4. Cleaned out the carbs but the problem persists, I've also tried fuel down the carbs of cylinders 2 & 3 but it made no difference. Is it likely to be the plugs?

Any advice gratefully received.

[CMSMJ1]

plugs would be a good start

You can swap the working plugs to the dead cylinders and see if the problem is reversed

Welcome to the site..

[Cammo]

Chucking fuel down the cylinders can quickly kill the plugs if they weren't dead already!

[Neosophist]

2 & 3 (Front Left / Right Rear?)

There fed by different coils right? In that case its not likely to be coil / plug lead issue.

As already been said though, plugs are fragile, so a new set first.