pdmtor

Hello, I've got 1995 YZF 750R (import) don't know where from though.. doesn't seem to want to rev above 9-10k without spluttering and missing, idles rough as well but goes great in between..? Only recently got the exup working, has improved mid range and not so much of a flat spot at 3k, new plugs and caps, (they were shorting) but still hasn't made much of a difference, and carbs have been balanced..alledgedly Anyone out there struck this before or no of any reasons and cures...? i'm stuck! cheers Pete