I ended up replacing the exhaust as I thought it might be blocked. It seems it may have been. The unit now starts really easily however over about 2 minutes of running the damm thing cuts out.

When I go to start it again it starts really easily. So guess I have solved one problem however now the unit is running it cuts out. I am thinking it might be an ignition module failure.......

Any thoughts? No unit no longer coughs and splutters it just cuts out randomly.