In relation to the Briggs attached, do you know if they were a 3/4 or 5/8 keyway, not particularly wanting to go and buy a set of callipers just to measure this?
Hi Paulie,
It's quite difficult to judge from a glance. It will take removing the engine from the chassis and separating the clutch assembly from it, and then measuring.
Although - I had the exact same engine on my 20 inch Model 45, and it was 5/8.
All of the (x number of) Model 45's I've owned and worked on with past generation B&S or Kirby/TM have all had 5/8 keyway shaft motors.
I personally don't know the older Briggs models that well to determine if this particular variant was offered with the 3/4 option. But the main thing that makes it more of a question mark is, the clutch half currently fitted with the 2x grub type set screws do come in the 3/4 shaft size option. So the possibility is there.
If it was a clutch half sporting the old captive cotter setup, I'd say it was 99% certainty of being 5/8.
The usual culprits for 3/4 shaft sizing I've come across on Model 45's are Honda powered.
