So?!

Let's make a fresh start. What model and year of bike do you have? What are you doing to measure this 1 1/2"? If you have the bike in gear and are turning the rear wheel all you are measuring is slack in the primary and transmission gears, between the tyre and crankshaft. Sounds about right to me.

 

What do you want to happen?
Is the belt not moving?
What have YOU done to troubleshoot it?

 

They all do that.

 

WTF??? This is the most idiotic post I have ever seen. I am am idiot even replying.

 

This is as clear as mud. What are you trying to accomplish? What is the problem? How are you obtaining this measurement?

 

Gonna need a bit more input here bud ,what kind of bike ? it moves 1-1/2" how ? side to side , up & down ? Back & forth while in gear it's common just slack in the drive drivetrain.

 

I just fired up my Ouija Board and conversed with Sir Isaac Newton. He confirmed my thought that if the rear wheel in fact moves 1.5", something is indeed happening. He went on to suggest that the motorcycle be rotated 180 degrees to the right and try again, unless you're in Australia, you should then rotate it to the left.

 

Pass me the envelope, again.