I understand that the primary cause for the big end bearings to fail is due to a low oil level. This hasn't happened to me before and from what I have researched, the dreaded noise is like 2 marbles hitting together (if anyone has a better description please feel free to share).

But my question is, has anyone had any symptoms of the big ends going (i.e a noise getting progressively worse) or do they just let go without any warning.

Any other information insight into this would be very interesting for people that this has happened to

 

I had rod knock due to low oil. Then i replaced the pistons..then got a faint knocking..metallic like ur describing...it started off pretty quiet but as time went on it got a little louder until 2weeks ago i spun a bearing on the same cylinder that had originally got the rod knock... U can pm me for more info though i am no expert on these motors...just sharing mt experience...billman is the local expert and he knows his stuff. Try shooting him a message if u got a question.

 

Thanks for your reply. I was just trying to find out peoples experience of rod knock like you have described. How long has it been since you first heard the faint noise until it let go?