How does the oil look when you change it? Just oil? Any other substances, coolant or flakes of metal? How does the coolant in the reservoir look?
I'm just thinking out loud here. I hope someone else chimes in. From what you said there is no blow-by from the breather, what about down by the shifter? Any noticable leaks down there?
Just talked to dad and here are some more answers.
The oil is black when they change it after 3000 miles. They bought the bike with 10,000 miles on it and he said that after about 1000 miles it turns black. It has been that way since they bought it, but just started using oil last year. There is no evidence of coolant/metal in the oil, but maybe a oil analysis would be in order. The coolant in the reservoir looks fine. There are no leaks anywhere on the engine. He has looked over it many times, as well there are never marks under it when they park it in their garage.
A quart of oil is allot of oil...
no leaks...is bottom of motor dry? or wet? check all over the engines bottom.
if dry...remove the rubber cover at the front of the swingarm...and put your finger inside the rubber cover...I am thinking the shaft seal out of the transmision....
check that the crankcase vent system is venting...
if it was the piston rings...you would see alto of blue smoke out the exhaust going down the road.
I am not trying to make anyone feel BAD...when the oil was last changed...Were he completely sure...the correct amount of oil was installed in the engine...
As just posted, the engine is dry everywhere. I do agree that with the amount of oil that is lost that there should be a haze behind her on the highway. He changes the oil himself religously every 3000 miles with OEM oil. This is mom's 2nd VTX and dad is currently on his 3rd Wing and looking at the new ones again.
They probably Seafoam treated the fuel, which is good, it keeps the carb clean. But that is not what I was suggesting. You need to introduce the Seafoam directly into the intake manifold so that it gets to the cylinder in it raw form. That is why I allowed the vacuum line to suck it up.
He ran the Sea Foam in the engine oil as described on their website. Ran it for a couple hundred miles to see if there was a problem with the rings that something may loosen up- out of desperation for anything to work. I suggested to him sucking it through the intake.
There is no PCV valve, just the hose. Make sure it's not crimped or plugged. Other than running rich, how does it run at low and high RPM? You could check the coils and wires, make sure they're all firing. Does she let the engine warm up before riding? I've noticed that running hard with a cold engine will cause oil consumption.
Thanks. He put a new hose on it when he ran the breather hose to the back of the bike. Mom has not noticed this bike to run any different than her last one. They do let them warm up before driving.
On another note, what type of compression gauge do you guys use on this engine? I went to hook mine up and the threads on the plugs are nothing like my gauge.