Further to the thought that there might not be rings on the piston.
I'm just sitting here pondering this idea.
Considering the doubling of compression by adding oil to the cylinder, one would have to conclude that the problem is likely rings.
However, with no rings, I's suspect that blow-by would be considerable. Thus causing a lot of oil to be forced out the crank case ventilation tube, into the carburetor and burned in the combustion chamber producing visible smoke. Accordingly, I'm back to the idea that the rings are either defective, improperly installed, failed to seat properly or the cylinder is defective.
The wet test, has pretty much eliminated valve guide seal issues.
When I spoke to the Yamaha dealership mechanic, his focus appeared to ensure that I understood that if they tear the engine down and don't find a problem, I'm on the hook for labor. So I replied that doubling the compression by adding oil to the cylinder, would appear to confirm that there is a problem and that it's likely related to the rings or possibly a defective cylinder.
There shouldn't be an issue establishing if there's a problem. The focus should be on the cause of the problem.
Not too confidence inspiring when the mechanic appears to be dismissive of the facts that I provided him. I sometimes wonder how well trained many of these "shop mechanics" are? When I told him that I was getting 50 psi dry and over 100 psi wet, he didn't even acknowledge nor discuss that aspect. It was basically bring it in we'll look at it. He was more concerned that I was aware that I'd be paying labor costs rather than what the possible cause of the problem might be.
I think I would have had a bit more confidence in the guy had he acknowledge the info I gave him and admitted that something is abnormal.
Either way, now that I have a registered complaint with Yamaha, I might just run the generator for a while to see if the condition changes. I'll likely take in to the shop in the spring, just prior to camping season.
However, I am very much curious to find the cause of the problem.... I'll have to see if I can resist bringing it in sooner.
I'm just sitting here pondering this idea.
Considering the doubling of compression by adding oil to the cylinder, one would have to conclude that the problem is likely rings.
However, with no rings, I's suspect that blow-by would be considerable. Thus causing a lot of oil to be forced out the crank case ventilation tube, into the carburetor and burned in the combustion chamber producing visible smoke. Accordingly, I'm back to the idea that the rings are either defective, improperly installed, failed to seat properly or the cylinder is defective.
The wet test, has pretty much eliminated valve guide seal issues.
When I spoke to the Yamaha dealership mechanic, his focus appeared to ensure that I understood that if they tear the engine down and don't find a problem, I'm on the hook for labor. So I replied that doubling the compression by adding oil to the cylinder, would appear to confirm that there is a problem and that it's likely related to the rings or possibly a defective cylinder.
There shouldn't be an issue establishing if there's a problem. The focus should be on the cause of the problem.
Not too confidence inspiring when the mechanic appears to be dismissive of the facts that I provided him. I sometimes wonder how well trained many of these "shop mechanics" are? When I told him that I was getting 50 psi dry and over 100 psi wet, he didn't even acknowledge nor discuss that aspect. It was basically bring it in we'll look at it. He was more concerned that I was aware that I'd be paying labor costs rather than what the possible cause of the problem might be.
I think I would have had a bit more confidence in the guy had he acknowledge the info I gave him and admitted that something is abnormal.
Either way, now that I have a registered complaint with Yamaha, I might just run the generator for a while to see if the condition changes. I'll likely take in to the shop in the spring, just prior to camping season.
However, I am very much curious to find the cause of the problem.... I'll have to see if I can resist bringing it in sooner.