Just a quick follow up on this, I bit the bullet and purchased one of these masport quadcut discs (plus stiffener ring)
https://www.gaspares.com.au/products/BLH7932?I put 2 blades to try it out, 2 minute install with the rattle gun. Reconnect plug lead, check oil, new fuel, turn on fuel tap (added that a while back), 4 primes and went with a quarter of a pull. Then settled down so much smoother than before. Quantums are generally quite good, but the big blade disc just completes it
For under $40, its a completely different mower.
I plowed it through a small bit of grass 65-70% as thick as what was absolutely killing it before - now at only 1/2 throttle without any significant bogging. Threw grass to the back of the catcher and packed it much better. Significantly less muck build up on the deck (to be expected).
Ended up putting the top end back to just on 3k rpm - just because it doesn't need the top end anymore but is nicer to have slower idle
Now I just need to work out the old Masport 400 - turns out someone mig welded a victa boss onto the quickcut masport bar. Will probably just throw a Rover disc and boss on that one.
Will eventually convert the other couple of masports I have
