Yes the small line is for a manifold pressure sensor.

I had the opportunity to put an hour of touch and goes on this afternoon. The results are in: The modification works wonderful. The engine is smooth through all of the rpm range. My nagging rough spot from 2500-3500 is gone.

Full throttle seemed to yield about 100 rpm more at static, with no roughness or missing. There are a lot of nervous nellies on fly-Rotax that refuse to believe anything but the party line from Rotax. I like my engine. A lot. I do believe there are areas that can be improved. This is one of them.

I had synced and synced my carbs with analog and digital manometers and could never get the midrange roughness to go away. Now it's gone. Smooth idle to 1400 with no chatter.


Very happy with the mod. No regrets.