1 cylinder running cold other three getting up to temp anyone have an idea of where to go next (cylinder 4) tight hand side had carb cleaned and rebuilt pilot screws only on base setting of 3 turns eliminated most issues and hoping to do compression test tomorrow wondering if fine tuning the mixture would maybe help solve this or does it sound like a valve clearance issue welcome any ideas thanks

 

have you verified that cylinder is getting spark? how do the plugs look?

 

HOw would I test the spark? Also other 3 I would say running rich a bit black maybe compensating for the cylinder and the cylinder that's having temp issues looked as though I was a nice brown colour for burning which my mechanic mate was questioning? Swapped the spark plugs and coils between 1 and 4 so not a spark plug or coil as the problem lies with the same cylinder is there any relays or fuses to check on?

 

Remove the plug put back into lead and rest on the engine case then spin the motor, you should fat a nice fat spark, if you have a spare plug, just whip the lead off and do the same.

 

pull the ignition coil out of cylinder 4 and leave it plugged into the wiring harness. remove the spark plug from the cylinder head and plug it back into the ignition coil. touch the threaded body of the spark plug to the head of a bolt on the engine somewhere and attempt to start the engine. if everything is functioning as it should, the spark plug will produce a spark. if you do not see a spark at the plug, remove the plug from the coil and insert a wire or screwdriver into the bottom of the ignition coil and check for spark again. you will want to hold the wire or screwdriver about half an inch from any metal object, otherwise you will not see a spark.

BE WARNED: you are dealing with high voltage at this point and there is a possibility the ignition coil will shock you. it has happened to me many times. it does hurt, but wont do any damage.

 

Cheers will have a look tomorrow when I'm back with the bike what would you suggest if there was no spark?

 

if you find that the ignition coil on cylinder 4 does not produce spark, swap it with one of the other cylinders and do the same test. if a coil that worked on cylinder 1 (for example) now works on cylinder 4, then you have narrowed the problem down to a failed ignition coil. if that coil from cylinder 1 does NOT work on cylinder 4, then you likely have a broken wire somewhere or a faulty CDI.

 

you have two coils and four plugs - if you get no spark on plug 4, follow the lead back to the coil and then to the 2nd plug it controls - if there's no spark on that one, the coil (or wiring to it is suspect). If there is spark on that 2nd plug, then either the plug or lead to it is bad.

I imagine as you said you only have one cold cylinder, If it's spark, either the plug is bad or the wire to it.

HOWEVER it's more likely a blocked idle jet in that carb.

 

He should have 4 coils, 4 plugs and no leads as the F4 is a coil-over-plug setup.

 

Okay thanks absolute massive help with info.sorry I have another question so just had a look online is the idle a threaded jet or is it a non thread pushed in jet? As when I done the carbs I cleaned all the threaded jets in the bowls and bowls itself looked online and seen they can be just a push in job. And it will kind of explain as the accelerating problem between idle and 3-4k and read it supply's fuel at low speeds.