I got a line on a 2006 883, that the owner says was up graded to a 1200.
It was like that when he bought it and doesn't know who did it.
What is the easiest way to verify if it's really been converted to 1200?
Thanks.

 

Look at the part numbers, are the 1200 HD (if 1200 hd parts were used), or aftermarket.
Or ride it and let you *** tell ya

 

This is something I found and saved from another forum:

You can actually measure the diagonal of the cylinder.
Jack up the rear wheel, take out both spark plugs
put the bike in 5th gear. Rotate the rear wheel
until the piston is at bottom dead center, BDC.
Use a wooden dowel or chop stick to feel when the
piston is at the bottom.

Then push the bottom end of the stick to the far side
of the combustion chamber and mark the end of the stick
where it hits the upper lip of the spark plug hole.
This is the diagonal of the chamber and it will be different
for a 1200 vs. a 883. Your measurements might be close to this.

For a 1200 it will be about 5 7/8"
For a 883 it will be about 5 1/2"

 

Thanks cHarley,

That's what I was looking for.