Yamaha RD 266 homemade expansion exhaust testing

[@thenameisluckyboy]

Mwoooooooaaaap hing hing hing

[@marcusmcclelland]

Does it go any better? it looks like it has too much header too me.

[@Alexie3333]

Ah. This was version 1 for more mid end power and to 8k rpm powerband. But cylinder porting doesn't fit. So last year made a version 2 what fitted te original porting better for 5.5k rpm - 7.5k rpm. Tested two weeks ago on dyno. With really rich jets 30 hp on the wheel. Yes feels real difference when hitting powerband

[@juhomaki-petaja]

Where do you live?

[@Alexie3333]

Eu