it probably has a 2.8 lever in it , that should release pretty quickly so your problem is the clutches applying to slow under light throttle.

Use an allen wrench to check the clearance between the lever and the servo pin that actuates it , 5/16 should be a snug fit , I set to 1/4" with a 4.2 lever .

What orifice do you have in there now ? I'd start by leaving it out completely ???