Thanks for the help Max. The exhaust port has 2 thread holes but my exhaust only has 1 slot for a bolt. I don't have a gasket on, however I will make one. Is it possible that i have the wrong exhaust type? I will also change it because one of my exhausts has a loose baffle but the spare's baffle is properly sealed in. The first time I ever got it running with a mate on Inox MX3 was nuts! So loud the neighbour inside her house could tell it was a few steps above a regular mower!
Cheers, Xav