The nipple on the exhaust side of the engine is fuel IN...the nipple on the Needle Valve side of the engine is Pressure back to the tank.

The one on needle valve side toward the rear of the pressure line out...(inline with the cam gear) connects to the nipple that is back at the Needle Valve assembly.


The main thin is the connections up front. The one on the exhaust side is fuel IN the one on the needle side is pressure out.


The check vlave installs with the arrow point toward the tank. This allows pressure into the tank and stops the pressure from coming back toward the engine.

here is the manual that came with the engine

http://www.yspartsandservice.com/pdf/FZ110.pdf


Troy Newman
Team YS