The following modifications where done by the previous owner who ran the bike on premix:
"Hi Mark,i put the carbs back to standard except for the main jets which are bigger because i soldered the #75 power jets up as recommended by hrc."
As the bike has the oil pump will I have to change the jets in the carb?
I have noticed that the airbox has been drilled and a standard air filter is installed.
The bike runs fine upto 10,000 rpm
any advise will be greatfully received