I have a 94 CBR 600 F2. I replaced the spark splugs about a month ago to try and get the bike running better but that didnt help. I just pulled the plugs to check valve clearance and both the no. 2 & 4 plugs still look brand new but the 1 & 3 plugs have carbon. So for some reason im not getting any spark or maybe fuel to those plugs because they dont smell of fuel. If anyone has any suggestions it would really help.

 

how u no no spark? is it running like poo

 

Yea its running really bad....more like barely running. I havent done a spark test yet but I will in the morning. Those two spark plugs are just to darn clean.

 

Check the ignition coils for resistance. Sounds like an igintion coil issue since 2 and 4 are on one coil while 1 and 3 are on another coil, so you may have a dead ignition coil for 2 and 4. From there, unplug the spark plug wire, but don't remove the spark plug. Plug another spark plug into the wire and ground it and then turn the bike over.

If you've got a blue spark, you know you're good on spark and have a fuel delivery issue. Work your way from the carbs back to the gas tank eliminating possible issues along the way.

If you don't have spark, work your way from the ignition coil to the battery until you find something wrong.

 

It would be way easier to just swap the coils and see if the issue is now no spark on the 1 and 3 cylinders. Most likely a dead coil... but go from there.

 

Actually 1 & 4 are one coil, 2 & 3 on the other, according to my svc manuals.

 

You're right 1 & 4 are on one coil and 2 & 3 on the other. Ive tested the resistance of both coils and those are good.

 

ya i was abotu to say 1 and 4 are on the same coil

 

Whoops! My bad.

Welp, checking spark is quick and easy, and probably isn't it anyways. Rule that out quickly and then move on to the carbs!

 

Well, if the wires had been switched around at some time and someone thought the same as Jesse did for just long enough to get them swapped. They then would, maybe, fire at the wrong time or something? Is this possible guys? The fuel that gets in there would wash the plug real good in between firing? I dunno for sure 'cuz I'm not up on my bike voodoo right now. Anyway, good luck man!!!