Problem solved! I think the previous post can be disregarded. The poor starting was due to the temporary throttle control setup I was using. It really needs to be replaced as it's off the old Scott Bonnar and the plastic is crumbling to bits.
In the video you can see it has been taped to the handle. It wasn't adjusted properly and was only opening the choke about 1/3rd of the way. When I held it fully open with one hand and yanked the pull rope with the other, it started first time (cold start). The engine is good to go!
