oil pump chain issues

[wishmasstir]

has anyone had any problems with the oil pumps on these? i have one and the oil pump chain is so loose i can take it off the pump by hand. do they stretch out or is there an tensioner on them that i dont have.

[maxitout77]

It must be a 250ex thing....

I just took my motor apart because it blew and the clain litteraly fell off when i tipped the motor on its side. I'm beggining to think this may be why it blew....

[wishmasstir]

the chain stretching is a sign of running low on oil but i didn't know if there was another thing machine specific or something