knocking in my 250sx

[baldbull]

when i first start my 250sx it knocks pretty bad untill it warms up then stops and seems like it is running really hot i can feel it on my leg to the point i have to stop after about 20 min. i changed the oil,does anyone know what this might be

[HuntingFor1]

Did the knocking start before you changed the oil?

[Dirtcrasher]

The 85's are known to have some crank failures....

Was it ever run low on oil? and was the oil filter put back in the right way?

Get a long screwdriver, stick the big end on your ear and place it around the running engine. You should be able to narrow down where the knocking is coming from.