Big Bore Kit for YFZ 450

[igotgrapes450]

the only performance mods ive done so far is a hmf full exhaust, jet kit, and pro design k&n intake, i have noticed so much more power, im interested in the athena 478cc bore kit, has anyone heard anything or have one, also, how much more power can i expect? thanks...

[400ex is money$]

i would get the ice cube 535 bore kit

www.maxrpms.com

[crandles]

I dont believe you will see a big power gain from just a big bore. I would put your $ towards a high compression piston, and cams. If you havnt done the cam mod yet do it first before aftermarket cams.