missing low revs

[NOBLEVTR]

hi the vtr i've just bought has a missfire when starting from cold and is labouring at low revs, the guy i got her from had fitted a k& n air filter and it had already got beowulf after market cans on. after reading some of the threads on here i've come to the conclusion that she needs rejetting or a original air filter fitting just wondered what you all thought cheers paul

[tony.mon]

Try an original air filter first, they're cheap enough, if that cures it you will need to get the jetting right to keep a K+N.