Need help diagnosing noise.

[prometheus578]

"Name callin' taint right."

Call me "limp wristed again, and I'll give you such a piston slap!
Jes... It could have been piston slap or a wrist pin, but those usually show up mit der high mileage wear(he's got 12,000), and the noise would tend to be more localized... the piston transmitting it directly to the cylinder wall.
Given that he had oil pump failure, and that the connecting rod crank bearing is the guy that receives the most stress from the power stroke, this seemed most likely.

but aren't the bearings in the lower case? Would think it would thump pretty good down there

It would thump down there... but has the rest of the crankshaft to absorb the vibration and noise, and has no direct means, no direct contact, with the outside of the engine case to transmit the noise, hence the noise is heard all over. Was a generally noisy engine (because of the problem), but you could tell that it was the right side. Pulling the plug wires will obviously quiet an engine, but when you pull the cap on the offending cylinder, you'll notice the difference between the other three good ones. The loud clunk, when reconnecting #4, signified that that was the bad cylinder; and the clunk was from down below.
Could I be wrong? It's possable. Even I make mistakes of judgement (I was married once) That's funny... how similar! I kept hearing irratating noises back then. They quieted down after I pulled the plug on that one, too.

[skids]

Re: "Name callin' taint right."

At least the bike has a kill switch to get some quiet.

Originally posted by prometheus578

Could I be wrong? It's possable. Even I make mistakes of judgement (I was married once) That's funny... how similar! I kept hearing irratating noises back then. They quieted down after I pulled the plug on that one, too.

[puv]

mro...........To answer your question....Yes! But it's not appropriate for all of our readers

[mro]

didn't mean to be over bearing

Sorry prom, "Could I be wrong? It's possable"

btw, over size bearings available?


mro

[prometheus578]

Really don't know to what extent the damage is till he get's it apart. journals could all be fine, and just the bearings chewed up. Didn't really run it too long after it sh*t the bed.

[knewsom]

Just out of curiosity, how much would a repair like this typically run at a shop? how much just for the bearing or rod knee that needs to be replaced? wouldn't it be best to do a full rebuild?

I'm curious because I'm contemplating purchasing a bike that APPEARS to have a similar problem (although it COULD be caused by a number of other things - I haven't tried any adjustments yet).