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This is the one you have been chasing for a few years already isn't it ? Could well be the chain drive...when I installed the Moto Spezial belt drive conversion on mine ,the first thing that struck me me was how quiet the engine became .Do the gears and the cam thrust bearing and if the noise is still there the rocker arm spindles and shims...there's bound to be a bit of wear there but is it detrimental ?
Do you have a mechanics stethoscope? (Not terribly expensive as I recall.) You may be able to further localize the noise using one of those. I recall someone chasing a rogue noise a while back. Someone suggested a worn wrist pin.John Henry
Pete, you may be able to isolate the noise or narrow it down by taking a wooden spatula and placing the handle end in your ear, gently. You can touch the spoon edge to the different parts you are checking. For a more precise sound lie the soon cupped part flat on the area you wish to listen to. It’s actually works for me better than the mechanics stethoscope.
I cant wait to see that Norge click over 200k
How long has this been audible? If it has done 192,000 I would not worry to much!
Does that engine have any aluminum gears on the oil pump, cams, et. al.? a la Daytona's/Centauro? Hard to imagine with all the miles, by many owners. R3~
At that sort of mileage the rocker arms where the contact the valve stems will be very worn which leads to inaccurate valve clearance adjustments. I replaced my rocker arms at 40,000klms because of this. Wasn't like they wouldn't have gone further but I'm fussy like that.Ciao
That may be close to what’s happening Phil.I check and adjust the clearances every 20,000 and they have not needed touching for the last few trips in.However, I will certainly go in again and check the rocker/spindle clearance..(wear).Are they an expensive item as a pair ?
Cant say I havent been there.... I spent more then a few hours chasing a running problem only to find out that the gas light doesnt work, and I had no fuel in it.. Been there, done that, got the TShirt