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exitandleave · 09-11-2009, 03:41 PM

Knock sounds like it's coming from top end, but could be wrong. The knock is consistent with the engine speed. Just changed oil and had metal shavings in strainer on top of the drain plug. Didn't change filter. Haven't done any engine work on it. Was running fine. Still runs good- just noticed the knock yesterday and the shavings today. Decided to take it of the road until I get it figured out.

Any insight is greatly appreciated guys.

seruzawa · 09-12-2009, 06:00 AM

Maybe the piston pin or a valve. You need to pull the head and cylinder and inspect everything. Better get a manual for the proper clearances.

09-11-2009, 03:41 PM	#1
exitandleave Registered Member Join Date: Aug 2009 Posts: 9	1980 yamaha SR250 top end knock? Knock sounds like it's coming from top end, but could be wrong. The knock is consistent with the engine speed. Just changed oil and had metal shavings in strainer on top of the drain plug. Didn't change filter. Haven't done any engine work on it. Was running fine. Still runs good- just noticed the knock yesterday and the shavings today. Decided to take it of the road until I get it figured out. Any insight is greatly appreciated guys.

09-12-2009, 06:00 AM	#2
seruzawa Robby Join Date: Nov 2001 Location: 8501 ft. Posts: 16,803	Maybe the piston pin or a valve. You need to pull the head and cylinder and inspect everything. Better get a manual for the proper clearances. __________________ I've seen things you people wouldn't believe. Attack ships on fire off the shoulder of Orion. I watched c-beams glitter in the dark near the Tanhauser Gate. All those moments will be lost in time, like tears in the rain.

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