Oil burnin thumper

[jacobone]

Well heres the story My friend bought a 92 xr z 250 it has 2 carbs and xr500 heads. i think its bord out. and it burns oil...... like every once and a while it will shoot out a blast of blue smoke like my 2 stroke.... it had an oil fouled plug...and we changed it.... i am wondering what we could do to fix it

 

[Bricks88]

From my car experience smoke during acceleration is valve seals and during deceleration is the rings.Cars and thumpers are both four strokes. JMHO

 

[Joepro9]

my old xr200 smoked and burn oil, the valves and cam were shot letting oil seep in.

 

[Studboy]

It's either the rings or the valve seals. It sounds like a rebuild is in store.

 

[Patman]

Originally posted by Joepro9
my old xr200 smoked and burn oil, the valves and cam were shot letting oil seep in.

:think: Care to expand with a little technical information on how the cam caused oil burning?

 

[jacobone]

how extensive of a rebuild is it

 

[jacobone]

cause for a 13 and 16 year old we probly can do right in his garage with some outside help

 

[Joepro9]

The valves and camshaft assemblys were shot(and all parts associated, Ie seal etc.)