St170 corona smoking on cold start up

[oem-r]

Ok just brought a corona for a cheap daily, when i brought it it started up sweet, no smoke or anything on wot, cold start etc..

Serviced it, changed oil, oil filter and sparkplugs.

Did oil and oil filter one day as i didnt have my socket set to do plugs, car was sweet, started fine no smoke, next day put new plugs in, and on start up it chugged out heaps of smoke, for about 30/40 seconds, and then it eventually goes away,

and during the rest of the day start up is fine, no smoke to be seen... only happens when i first start the car in the morning?

Any ideas what it could be?

thanks

[MR2BOY23]

Did you get the right plugs

And is it black smoke?

[fivebob]

Was there any oil in the sparkplug wells when you changed the plugs?