hi i have a 2000 sv650 s which i have just brought to try my luck at mini twins it is ment to be 72bhp but no prof its fitted with a bmc filter re jetted ?? full system and a techi flow adj rear stock .its not a day light mot just be out 4 my first ride

but after 20 mins it starts to miss fire


any idea's please lady's and gents???
what spark plugs should i use ??
manythanks for taking timeto read this

bigcookie