big bearing broke

whats the cause of the big end bearing on my crank to go? i think its seized or broke and jammed. its gone a pinkish colour on the crank by the end :/ i had a new conrod/bearing put on less than 4000 miles ago aswell...a reinforced one , because i have a 70cc stage 6 cylinder on it any ideas??? thanks , and how ,much to repair

 

bad jetting? or maybe not enough oil, you running the standard oil pump?

 

Jetted right and premix :/

 

must have overheated somehow, or maybe you got a duff crank?

 

could it maybe of been installed badly?
ive heard if you put it in using things like hammers and use sideways impacts they can fail very quickly