KTM 520 AMA questions

[yzeater]

How can a KTM520SX race in the 250 class? I thought that the maximum bore of a four-stroke in the 250 class was 450cc's. Was I mistakened? What is the maximum bore in the mini (80) class? Where do they draw the line at production based in AMA rules? Thanks a lot.

 

[holeshot]

next year

The 450 limit comes into effect next season.

 

[Jake T]

I think the limit on the 80 class for 4 strokes is 150cc's.
Think BBR TTR150's. mmmmmmm :p