Best Sprocket Combi For 400m?

[gab araya]

Need help. Whats the best sprocket for my set? Thanks

65mm juwei
21.5/19 shark big valve head
Gear 1 2 4
28mm carb
balance crank
Regrind cams
Brt dual cdi

 

[John Jordan]

Need help. Whats the best sprocket for my set? Thanks

65mm juwei
21.5/19 shark big valve head
Gear 1 2 4
28mm carb
balance crank
Regrind cams
Brt dual cdi

boss musta set up nyo? wala ba nging problema sa compression at gasket? 65mm tpos 19/21.5 na valves ok lng?