Picked up a 1980's FL250 with a good motor (( Internal Combustion Engine ? )) for $650 this past weekend. Not sure of the year as of yet. The Engine has 128psi of compression which matches the manual spec of 9kg/cm^2. Looking into the exhaust manifold the piston and rings look new. Needs tires.

I am wondering if I should buy a jet kit to tune the carb to match the bassani pipe or if the stock 120 jet will be fine. What needle groove was the clip in for stock location?

I took the fuel tank out and recycled the gas. No gas was getting to the carb so I took the fuel pump apart, didn't find anything obvious. The carb was rebuilt by someone who didn't know what they were doing, the slide was half way up the carburetor bore because the throttle cable had been adjusted all the way out on the steering wheel. The needle had been set way high by sliding the c-clip 1/2" down the needle, it wasn't even in one of the grooves. Going to purchase a carb rebuild kit but wondering if I should buy some larger jets to match the bassani pipe.

Almost always the needle clip is in the middle position from factory.

No fuel to the carb ------- ohhhhhhhh ------ Most likely the fuel pump is shot.
Lack of fuel flow is deadly to a two stroke. You WILL melt a piston.
I will repost the videos of fuel pump testing for you. It might take a while because uploads for me are real slow. When I get them posted I will link it here.
CO

You said: "Not sure of the year as of yet".

Click on this link for valuable info:
viewtopic.php?f=2&t=18393&hilit=manuals
CO

Edit: You can click on anything highlighted in blue and it will open a link to something.
CO

Here are the reloads:
https://www.youtube.com/watch?v=GeFnjQpecyQ
https://www.youtube.com/watch?v=KzP1CpGDW7M
https://www.youtube.com/watch?v=utIBZx8xPXw
CO

Edit: One more https://www.youtube.com/watch?v=zkZOCTImIrE
CO