250n carb jets

hello

as some of you my know i have been having issues with the bike not running properly..

after taking the carbs apart yet again, this time i wore my magnifying headset, and noticed strange goings on with the main jets..

the carb that works fine has a 105 secondary main jet and a 72 primary main jet

the carb that's playing up has a 105 secondary main jet and a 105 primary main jet

so i suspect this is the root of all evil

that being the case, has anybody a 72 primary main jet kicking about they wish to exchange for a beer token, failing that its £10 + postage from silvers

thanks

richard