Patrick sorted the problem with the gearbox pipe, it turns out that the push on connector wasn’t quite locating. Some of the steel pipe section needed bending slightly to give the flexible pipe a bit more slack so it would push on properly.

So it’s all up and running now and just needs a bit of bedding in and tweaking. The engine seems a bit low on power at the moment so I’ll need to figure out what’s going on there. It’s fine at low revs but seems to hit a brick wall at higher revs.