Hi Norm and Mf,
Hard to pull start can be a sign of excessive valve clearance as the compression isn't released for starting ,obviously you
can't adjust the clearances on Top Dead Centre.
The 10.5 looks like a newer motor than the 11 hp motor , if there's no ring gear on the 10.5 the 11 flywheel should fit.
I don't think you will waste much time if the parts don't swap across Norm. I would think you shouldn't have a problem
changing the parts over.
Cheers
Max.
