'96 F3.. Weird issues... misfires all around...
Hey everyone. First post here. Glad to find a resource like this for the CBR's. I've had my 96 for three years now, and never really did much to it besides the obligatory oil changes.
I was out riding a the other day with a few friends, and found a cool road where I could get a foot or two of air. It was a bunch of fun. Anyways, after riding the road a few times, I noticed that at low RPM, low throttle situations the bike sounded like it was running on only two cyl. Upon giving it more throttle and accelerating it seemed to clean up and run fine at any condition where the bike was under load.
Well, took the bike apart, realized it had come with a K&N, so I bought the recharge kit and recharged it. Replaced the plugs with what the shop sold me, which happen to be CR9EK's, which are a dual electrode plug but I have read they are compatible. Also replaced the fuel filter, and checked the operation of the fuel pump. I guess it only pulses when needed on the F3? Anyways, that's what it does, and I did read somewhere that that is proper operation for the f3's pump. Oh, also sprayed some carb-clean into the carbs while I had it apart.
Now the real weird: Not only did the weird part throttle / low load only running on 2cyl sound not get remedied, but now full throttle bit the dust. It seems like it's all going well, then at 8k+ rpm, nothing but broken up misfires in any gear. I'm perplexed.
Anyone have any suggestions? I've been staring at it for two days, I just really don't know where else to look. A tune up should have resulted in a better running bike, not worse.... no!?
Bike is stock besides K&N and Two Brothers slip on as far as I know. I've put 4k on it without issue before this.
Thanks for any help.