very interesting topic. i had always thought my 24 just had higher compression ? now i know why its a bugger to pull start. i hope you sort it NormK. thanks for sharing.have you tried starting it without the belt? i am guessing yes.
if a normal blade disc spins up quickly when pulled. maybe the belt is slowing the spin up and giving the decompressor enough time to fully close before the next stroke.making it hard to pull cos its closing too soon. seems it would be the opposite of this in theory, BUT ?
anyway hope you fix it for us all .cheers mate.

If my collection is complete ( then how come i keep buying stuff ? ) 🤔🤔🤔🤔🤔