I finally got a chance to mess with my youngest sons 400.
We did the exhaust mod, Air Box mod, K&N and a full dynojet kit with the 170 main jet. We haven’t had a chance to really ride with the jet kit installed but with the other mods it seems like it had more low end power but lost a MPH or 2 up top but it’s was into a headwind. My son loves it and in the short ride he did take after the jet kit he says it feels stronger than ever.
We did the exhaust mod, Air Box mod, K&N and a full dynojet kit with the 170 main jet. We haven’t had a chance to really ride with the jet kit installed but with the other mods it seems like it had more low end power but lost a MPH or 2 up top but it’s was into a headwind. My son loves it and in the short ride he did take after the jet kit he says it feels stronger than ever.
