smoking on startup

[levonskinator]

so the 400 is smoking on start up and whenever I punch the throttle, and it would seem like it would be valve seals but i just did them maybe 20 hours ago. when i did them i was super careful to make sure that i did not rip the seals. Do you think it is the seals again or does anyone have any other ideas?

[honda400ex2003]

sounds like it but after doing them not that long ago, it doesnt seem likely unless something happened that you dont know about with them. it would be a waste to tear it down just to do that. maybe it is time for some rings and it is just starting to get bad. have you done a comp test and a leak down test? they will tell you what is wrong with it for sure. steve

[levonskinator]

i did the rings when i had the motor torn down for a rebuild, and the cylinder was honed and i broke the motor in. Looks like i'm gonna have to do a compression test

[a4guy]

My first guess would have been rings but you said you just replaced them.