jbiv wrote:
This is like hitting the plastic ends of two screewdrivers together lightly. Not quite metalic sounding. I scoped the engine and everything has that nice sewing maching noise then the cam area has that tat tap tap. Engine does not miss a beat though.
First off, when you say "cam area".....you know the cam is down near the crank, right?
If you've got a sound down there, then I dunno, But I think what you mean is up where the rockers are in the top end, and if that's the case I'm really, really familiar with the sound you speak of. I like your description of the two plastic screwdriver handles hitting each other. That's very much like mine.
This is the "knock" that some of us have, some don't, some don't care, and for some it drives us nuts. My bike sounds like a million dollar, blueprinted hot rod for about the first 8-10 minutes I run it. Then, as it gets hot, there's that knocking sound under a light load. Yamaha has said that it makes this sound as the oil thins out, so many of us have switched oils and found an improvement. I've used Amsoil, Mobil 1, Castrol and found no change whatsoever. None. Zip. Same characteristic sounds after about 10 minutes. I personally find Yamaha's explanation incomplete and illogical. Clearances in engines are supposed to tighten up when warm, not loosen. And I'm somehow to believe that only the perfect motor oil is supposed to magically quite that big old knocking sound? Don't think so.
Doc says....and I've been meaning to ask you about this, Doc......that if the motor is noisy with heat that the valves need adjusting. I'm going to try that soon but I need to find time and the nerve to get in there. I'm a little doubtful that with only 4000 miles on her the valves are whack, and also that would indicate the valves were whack ofter only 300-400 miles, since that's when the "knock" started (near as I can remember.)
I'm thinking about adding an oil cooler, since it really seems temperature related. (In winter riding it's much quieter). We'll see, but in the meantime I enjoy my Roadie just the way it is. It's big, bad, noisy, torquey, geared right, and comfortable. It also seems reliable as a hammer, and people on here will tell you that theirs have been banging and knocking for 80,000 miles and never stopped, but never let them down, either.
If I find the answer I will certainly share it here,but in the meantime I've got a lot of riding to do
