Looking for some assistance... I've got a FG90R3 in a EF Yak 54 with a CH Ignition prop hub and a Keleo exhaust running 20:1 Klotz. This engine ran well in a Corsair before this aircraft if not a little hot, 250-265F full out a couple times. The issue I'm having with his bird is that I'm trying to tune the motor with a new prop, Bolly 24x12 and it runs pretty well for the first cold run. I'm getting 6200rpm on the ground. After shutting down to refuel, it just doesn't want to restart. If I can get it running, the motor will idle fine but I cannot advance the throttle more than 1/4-3/8 before it starts to run really rough and I'll have to return to idle before it dies. The plugs are new, tappets were adjusted at that time. The engine is fully baffled in the cowl. Turns are 5 main needle and 3-3.5 slow needle. Any ideas?