neutral

I've only ridden one of these things for perhaps 10 minutes total, so bear with me if I ask some dumb questions. Got one of these 3 speed 'semi-automatic' ST90's the other day. 3 down, neutral up. It doesn't seem to want to shift gears unless the RPM's are down a bit. I'm cruising along...

Have about 100 miles on a Lifan (Z-Star) engine in a 73 SL-70. While out on a road trip was down shifting, coming to a stop. Bike went into neutral and will not shift out, up nor down. Big Rob and I switched the engine out today, thankfully I have lots of good help, but has anyone experienced...