I would be contacting nFlow and talking to them about an overhaul.

 

Looks like she's been hot.

 

Yea I’d say so too... no bueno

 

dblount044, give us a call here at nFLOW Engines at 812-402-8282 and ask for Chris. He can go over the details of our remanned engine program. Thanks for the recommendation pyromedic. www.nflowmotorsports.com

 

Does anybody have a possible theory as to why the lobes of the crank have that’s flat smooth areas on them?

 

I believe it’s designed that way.
As far as the discoloration ( heat marks) on the crank, that is normal as well.
From Polaris the crank and rod assembly is not Serviceable, it comes as an assembly.
The 2 piece crank is heated to expand the metal and the Rod / journal assembly is pressed together.

I have no idea about your mechanical ability or the tools you have at your disposal, but just looking at this you may want to consult a professional.
There appears to be several specialty tools that you may need.

 

Thanks for the input Toxic. You are correct in that the crank counterweights are designed that way to balance them. I just ran up to my local Polaris dealer and had then press the crank out for me for about $12. I’m fairly mechanically inclined and know I can rebuild this little single cylinder motor but it’s my first ever and will probably take me a little longer as there will be a learning curve there. I also had the shop look over some other parts for me to help guide me on my way.

 

You can pull the crank apart but not sure you could get a new rod, we use to do this when we were racing sleds, would balance and weld the pins when it went back together.

 

I echo what Larry said.
I’m not aware of an aftermarket rod, but I have not looked very hard either.