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I have seen the video of an 1800 being built and how they showed the smoothness of the engine by balancing a nickel on edge as it ran.
My 91 Interstate is just as smooth only I used a penny!
Ticking over at about 800 or so rpm, I sat the penny on the left valve cover and it stood there!
I have photos but they are too big to post here!
The Wings are one smooth running bikes!

I have seen the video of an 1800 being built and how they showed the smoothness of the engine by balancing a nickel on edge as it ran.
My 91 Interstate is just as smooth only I used a penny!
Ticking over at about 800 or so rpm, I sat the penny on the left valve cover and it stood there!
I have photos but they are too big to post here!
The Wings are one smooth running bikes!