well im doin up this piaggio zip 50 2000 model and it´s got tenigas exhuast and ive put a k&n on it it was already deristed but im avin a problem it´s gota 62 main jet in it and it keeps bogging out the bike shop told me a 56 main jet is standerd i got dis hayns scooter manual and it says in there it shud be 70 so i tired dat and it was even worse so it´s way over rich there i orded a 56 and a 60 jet do u fink the 60 shud work ok thanks