Here is an observation I made last night that you might be interested in commenting on.
I had pulled the engine out of my 1975 trike to replace its alternator stator.
After reinstalling the engine, I remembered I hadn't removed the old exhaust port gaskets. Lying on my back on the floor next to trike, I utilized my cell phone flashlight to see and remove the old exhaust ring gaskets and noted the #1 cylinder exhaust valve underside was visible. A perfect opportunity to examine the valve and exhaust port carbon deposit situation.
Then I looked into #3 cylinder's exhaust port to examine the same areas. Seeing a difference in valve coloration, I took some photos in both exhaust ports.
The number 1 cylinder has the light colored, closed exhaust valve. Number 3 is the darker, partially opened exhaust valve.
I know that people beat to death
about "reading" spark plugs. But, feel there must some tangible value in "reading" valves, too.
This now 35,000ish miles engine runs, I think, well.
It always receives 87 octane fuel. The 1976 LTD carburetors were serviced by me and resealed with Randakk kit components. I feel that I did a good job.
In the past when diagnostically tested, the engine had consistently presented exceptionally minimal (5%) cylinder leak down test results, but I never got an opportunity last year (broken leg ) to retest cylinder compression results after changing its valve lash clearance to 0.006".
Historically a Very small amount of engine oil consumption over 3,000 miles.
As far as I know, the cylinder heads have not been removed, and the valve stem oil seals haven't been replaced. At least, not by me since I received it with 7,831 miles on the odometer.
I believe what I would want to know is why there would be such a notable difference in both valves coloration, the difference in amount of carbon accumulation underside both valves, but the exhaust valve ports appear to have equally significant amounts and coloration of carbon deposits.
Regrettably, my son arrived to assist me to put the exhaust system on, and I neglected to examine #s 2 and 4 cylinders'espective exhaust port carbon accumulation, before installing that side exhaust, too.
If I weren't so sore from taking a tumble last night, I'd get back down on the floor and pull that header off to examine the 2 and 4 exhaust valves, too.
Thank you for imparting the wealth of your knowledge and experience so generously to us, too!
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