I find it interesting that I own 2 bikes which are very popular in other countries due to the tiered system;
The TW200 is very popular in Japan in the lowest tier (search YouTube for 'TW200 Japan'), anything bigger than 200cc's prices the everyday Joe out so they'll mod those to insanity.
Another is the RD/RZ350 in SE Asia as the tier changes at 350cc's. A modded 80's era RD/RZ's being 2strokes can compete with with the HP of a modern 650 4stroke, so only a fool would not take advantage of this convenient loophole.
The TW200 is very popular in Japan in the lowest tier (search YouTube for 'TW200 Japan'), anything bigger than 200cc's prices the everyday Joe out so they'll mod those to insanity.
Another is the RD/RZ350 in SE Asia as the tier changes at 350cc's. A modded 80's era RD/RZ's being 2strokes can compete with with the HP of a modern 650 4stroke, so only a fool would not take advantage of this convenient loophole.