I've searched and seen a lot of mentions of knocking.
I recently had to replace the clutch basket on the DRZ. I noticed that there were some shavings. But I attributed that to the basket being notched badly and a tang broken. I put everything back together. Started it up the day before, still had some knocking noise. But not as bad as before. I went to ride it today and it sounds like it's knocking at low speeds. I drained the oil and saw shineys out of the frame drain. Couldn't tell much about the crankcase drain. But the oil filter has metal (not alum) filings in it. All over it. The oil pump has been chewed up as well. I checked the primary nut, it's tight. But I noticed about 1/16" play and a noteable thud when changing the crankshaft direction. Shouldn't there not be any noteable sounds/play turning the crank? I know it's not the counterbalance as I held pressure on it to rule it out.
Also I notice the clutch hub had some marks, so I'm replacing that as well. The disks look black and some of the ears of the frictions have scratches on them.
I know the filings are steel as they stuck to a magnet.
I'm bidding on an oil pump, stock clutch assembly (for the hub and plates), and a crankshaft.
Should I just put the oil pump and clutch parts in and see what it sounds like then? (going to replace the crank oil seal) Or just pull the engine and install a new crank?
The bike still has a ACCT, but I just installed the updated ACCT (looks just like the one off my DL650)
This bike is friggin cursed. First owner seized the crank, replaced engine (I owned it then). Second owner ate the piston, put an athena 435 on it. Then sold it to a friend. Then I bought it back. I thought the engine had been sorted.
I'm just concerned where the filings came from. Possibly the clutch, but it was an aweful lot in the engine. I'm afraid it's the big end bearing.