300ex bore kits

[300exdragracer]

i was wondering what is the largest big bore kit, how much, and the link to the site thanks

[300exPat]

largest i think is a 380 but i wouldnt count on it lasting, the safest highest one i think would be a 350 from powroll or sparks racing
www.sparksracing.com
im not sure about powrolls

[bradley300]

if you stoke it, you can go to atleast a 405, seems like a have also seena 416

[300exdragracer]

ok thanks guys

[ghak99]

Actually the with a stroker the 425cc to 428cc motor used to be very popular, but were not very dependable. I have heard many praise the 375cc motors and will be building one this winter, but here locally the 406cc 250x motors rule the flat tracks in the 250x/300ex class.

If you are only looking to bore then I agree with gt's 350 kit. I believe the piston to be right at 82.5mm

[300exdragracer]

k thanks ya i will stick prolly with the 350