Honda smoking situation

[gulley04]

i have a 1991 trx250x runs great very reliable,but has started smoking very bad when i first start it.it runs the same as before and is not low on oil.What do you think is wrong with it and how can i fix it?

[jadedracing]

you most likely have a problem in the top end, if that motor is original, which it wouldnt surprise me, i'd do a bore and piston, gaskets and valve seals, if it started doing it all at once i'd look at gaskets and valve seals, normally and i mean normally a worn piston starts smoking gradually to where its really bad over time and sometimes not until its warmed up