Try some Seafoam in the tank, use the tank up and refill.

Well I took the plunge and went for plug replacement following Honda’s ‘in from the front’ method. This involves taking the whole fairing off (many, many parts), removing the oil cooler and removing the rad. The plugs are then buried deep in the head connected by ~4″ long socket thingies. I don’t know if the inscrutable Japanese are issued with tiny hands at birth but having mits suitable for a mouse gynaecologist would really help…

Bad news; it isn’t the plugs 🙁 Good news; it’s booked in to Nonda for a service and fettle next week as there’s no way I’m going in for wholesale swapping out of injectors, coils etc. My bet is on the fuel reg as it smells a bit petroly but we’ll see.

BTW, it hasn’t magically fixed itself with more fresh fuel/mileage etc. Shame, that would be a nice easy (cheap) fix.

Harumph! Well at least you now know it isn’t the plugs, after reading that it’s only one cylinder that’s cold, my best Internet guess would be a failed coil (easy to check by swapping the coils over, and seeing if the cold cylinder moves with it, and cheap to source a good s/hand coil. This would also make it smell rich as the unburnt fuel gets pushed through the system…)
2nd Internet guess would be fuel pressure regulator, but keep us posted on what Nonda find

BTW, the 4 inch long socket thingies are the coils…

Trustyrusty – Member
BTW, the 4 inch long socket thingies are the coils…

Aaahhh thank you. Every day’s a school day. I stopped working on oily things after my first car; mk1 Escort. Happy to outsource to people who know what they’re doing/happy to do it.