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Pretty stumped on this one. I recently built my first am ski. Gen 2 bob. When I snap the throttle from low rpm to full it cuts out but doesn't stall. The rpms galop a little but won't pick up. When I pull the throttle to 80% it hits hard and if I pull it to 100% a little softer than a snap it...

So when I put my solas mag pump up to my OEM wear ring there is a gap on the inside but the outside is tight. (See picture) Is this normal or am I missing something? What are my options? Thanks