Slight Oil Leak

[mvk24_imp]

a stethoscope is a great idea, I'll give that a try. The noise that mvk24 describes is about exactly like the one I hear, I believe it changes in frequency slightly with the throttle input, like say, hammering down when in a lower RPM. However, that could also just be my body positioning and hearing. I figure, since I have the leak anyway. I'll go in there and kill both birds. you sad you added washers only to the front 4 bolts? I wonder if it is more of an issue with the rubber mounting isolators degrading and causing the gap or like you said, just not enough clamping pressure.

It is very possible its just a normal noise or injector etc. If it goes away after replacing the parts, I guess I'll know for sure.

For me i literally rode to a location and everything was normal sounding.

On the way back I was picking up speed getting onto the highway and suddenly heard the "sound" and I was getting paranoid being a new sound on a bike is never good. Its subtle but if you're paying attention its definitely a sound that you can turn on and off just by coming on or off the throttle. Like I said above all of a sudden its a new "whine" or almost like a high speed Chain Noise sort of sound. I checked everything including chain alignment and cleaned and lubed. New sound was still there.

Took awhile to sort it out because everyone tends to think it's the injectors as that video also mentions. But if you shove a rag over that area of the PAIR valves and ride around the block and the noise goes away its the pair valve leaking when you're in throttle.

I only just added the washers under the front 4 valve cover bolts when I put in the new seals/orings and put the cover back on. That part 2 video exists because just doing the seals worked for him for about 600 miles and then the sound was back. He used a feeler gauge and realized that gap where the port/tube is that you're sealing with those orings/seals is surprisingly larger then you'd expect so by adding the washers he was able to squeeze down the cover ever so slightly more in the front (where the PAIR valves are) and the air leaking under throttle/load stopped again and was "fixed".

No part 3 video so I'm gonna assume it worked after that.

I am curious how many guys may have gotten these bikes second hand that don't realize that's not a normal sound for the bike. It is apparently a pretty common failure point with the Honda motors that use this sort of PAiR valve/Reed system in the valve cover for the emissions. But I don't think it causes any real performance issues so most guys probably just think it's a normal sound for the bike.

2014 CB1100, 1981 KZ440 LTD, 1993 Yamaha XJ600 Seca, 1994 Yamaha XJ600 Seca