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I just had it serviced @ 9k, it has 10.3k now.
How could that be? The two sides are always going exactly the same speed, being on a common crankshaft.
There might be one point where they go the same speed, but with the 90º you've got one piston stopping at the top/bottom of its stroke while the other is still moving through the middle of it's travel. Even a V8, which should be the least affected by the varying speed of the pistons and such often has a harmonic damper.Any out of balance condition, either with the physical masses involved or the power pushing them, can cause vibration. I think every bike I've owned has had some range where the harmonics come together. I mentioned in a previous topic recently that my EV does it for about 150 rpm @4800. I'm not sure if the small blocks have u-joint issues like the BB's do, but have you considered a bad u-joint or carrier bearing?
small blocks have no carrier bearing. that are a single knuckle ujoint, not double.alignment is critical however...
Hmmm, the engine goes 1 2 silence 1 2 silence etc. much like the Harley potato potato on steroids.How about it maybe being the universal joint?
My take...All machines have harmonics even humans hummmm.I notice that when I take a trip on my beemer, when I first start out I have to get used to the harmonics particular to the r1150 which vibrates one mirror more than the other at different rpm and the "rolling" vibration described by others in this post. After a while I notice it less and less and get used to it. After a days riding its is hardly noticeable.There have been many books written about the harmonic vibration between engines and the machinery. Its a black art and very mysterious.3500 miles later I climb aboard the CX and for the first few minutes Good grief!! It vibrates completely different and feels very odd with completely different harmonic vibrations, almost alarming. U joints going bad? Dead or dying cylinder? But then after a while it all becomes very normal and sorta disappears. The same happens if I have not ridden anything for a while. Not suggesting that you ignore the signs, of maybe something amiss but to give it time and like a bear in the woods it might just go away.mike :-)
Yeah, it's kind of like when you're on the fantail deck(rear) of a Destroyer(DD784) made in the late `40s and you hear/feel the rythmic turning of the propeller shafts rotating right beneath you @ X rpm(knots) and it just so happens your bunk is down there too right next to the twin 5" guns/turret which shoot @ night while you're trying to sleep! :D You hear all kinds of sounds and only hope you stay afloat....which you do. I could even hear the water splashing on the other side of the hull (1/4" thick) of our berthing compartment too whilst off Vietnam doing shore bombardment directed by a spotter place @ the DMZ.
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