912 ul on a kit fox 4. Just completed it. Zero time engine. I synced it, but runs rough / dead spot around 3400-3800 rpms. Almost seems like needs a bigger jet.? I did put a air box in the front of the engine feeding both carbs. Should be better air flow. When I synced it, it doesn’t stay consistently synced through the entire throttle range. But not very far off though. Cables don’t seem to be binding or unequal lengths. Any thoughts?
