Bottom end noise

[robert.b.west]

My bottom end on the left side makes a significant amount of noise that I only notice when it is idling. (but I think that the exhaust noise just covers it at higher rpm's) It sounds like it could be some play in the wrist pin bearings. (Just a guess) I have taken apart the top end and replaced the bearing on the wristpin in the piston and that did not seem to have any less play. The bearing around the crank does not seem to move up and down much if at all but it seems like it can be rotated more than I would think it should and when I say rotated I mean rotated around the axis theat runs through the center of the crank rod the long way. How dificult is it to take out the crank and either change the bearings or just replace the whole crank assembly. I have not done any lower end work yet. Any help would be great.

[383TA]

Any news on this? I have the same issue with my left cylinder, and I was worried that it was possibly a bearing but then I felt the expansion chamber on that side and I could litterally feel the sound, Which now is making me think that cylinder is leaning out which is causing some detination. After thinking this it did sound alot more like a "PING" then a "knock" So I'm keeping high hopes. and plan on ripping the carbs apart this weekend to give them a good clean and make sure my jets are good.

[brian102]

does is sound like a little metal piece just rubbing on something? when im idling it sound slike two metal pieces just barely rubbing against each other, it doesnt do it everytime,is that what yours sounds like or has anyone had this before?