1974 250 HS

[Richard Carlson]

What is the minimum compression on that motor?

[G Ellis]

90 to 100psi.

[Richard Carlson]

Thank you, I have around 100psi, bike has been in the barn for 30+
years and I have restored it just having trouble getting it to run.
I poured gas in the cylinder and it fired after 2 kicks and idled for a sec put on the gas tank and it ran on full choke but seemed loaded
up put new needle and screen in the carb hasn't run since thinking maybe crank seals or float level or floats. Help!

[Larry Perkins]

What Gary gave you is bare minimum.  To run well it will probably need to be bored.

Larry P

[G Ellis]

If it will run on full choke, Pilot jet is plugged.