D3 Major
Starts fine but fills the street with smoke.
I know they are smoky but this is wayyyy bad.
Mix30:1
Removed head- appears to be new +060 piston.
No sooting at all very clean.Plug not fouled.
Bore appears unmarked.
How do I know if previous owner fitted rings correctly? pegs alighted but are the rings square section or chamfered?
Black burnt oily residue blew out of exuast joint.
I'd put it back together and go for a long run!
The smoking should settle down, there's probably a lot of oil in the silencer which will burn off.
As Stubaker says,
Just go for a good long run , but be conscious of a clearly rebored cylinder and piston.
Oil to petrol 25 to 1 and basic 2T oil.
It'll clear up on its own
keep an eye on the gearbox oil level. if it keeps going down then you could have a crank oil seal problem.