Thanks Jimmy,
I found that out when I pulled the carb off to have a look
Engine install is complete and now waiting on the weather to play its part so I can get it up in the air. It ended up being a fairly easy install replacing the Zenoah - just moved the throttle servo to the left cutout already available in the fuse and used a sullivan brass plated cable for the throttle as it was the easiest option to thread between engine and muffler. The only real effort I put in was cutting 10mm off the Bisson inverted muffler and recapping so it would fit under the cowl.
