I am just completing a build of a benelli 250 2c and have new expansion pipes fitted. The carbs are VHBZ 25 B with 98 main jet. I have been sort of told that I would need to jet up 3 or 4 sizes. i spoke with a guy who has done similar things to his bike (250 2c) and has jetted it up to 130, which seem a massive jump.
I would appriciate any help and guldance if possib;le please?