New "clanking" sound - cam tension?

[Godric]

Hello all, I've been having trouble with my 81 tci stock xs. Been riding around all summer with little issue and now I took it on a longer ride (50+ miles) and it started choking out and acting like a carb was clogged. So I went through the carbs, checked my clearances, adjusted cam tensioner, put a fresh charge on the newer battery and it sounds like trash. The cam tensioner doesn't go in and out like it used to, when I was adjusting it it had very little to and fro action, not nearly as much as I remember. New chain guide less than 1k, including full top end gaskets and lapped valves. There was no visible wear on the camshaft or lobes when I was in there, no scoring of the cylinders and I installed new rings. Compression seems good, although I don't have a tester. But listen to the video and tell me what you think this god awful noise is coming from! Thanks guys, y'all be safe out there

Video link

 

[Raymond]

Hi @Godric, it don't sound too good but the video was too short for me to hear where that rattle is coming from. You could try the screwdriver/stethoscope trick - ear against a long screwdriver to listen to parts of the engine - it's amazing how that can narrow down where a noise originates.

 

[Jan_P]

Yes it is short For thinking out loud Con rod bearings or crankshaft bearing
But please listen as Raymond suggest screwdriver/stethoscope trick

 

[Godric]

Hey, I'll upload another vid on the meantime shortly. Thanks for the quick reply

 

[Godric]

It's coming from the top right, but all 4 cam bearings and seals are fresh with the rebuild

 

[Jan_P]

I would start investigating that

The cam tensioner doesn't go in and out like it used to, when I was adjusting it it had very little to and fro action, not nearly as much as I remember. New chain guide less than 1k

I believe it can be taken out for inspection --- please check in service manual

 

[Wingedwheel]

I would see if a valve adjuster came loose.

 

[jetmechmarty]

I believe it can be taken out for inspection --- please check in service manual

Yes, you can remove the tensioner assembly for inspection.