Hi Garry, and a warm welcome to the forum. grin
It's great to have another Scott Bonnar Model 45 owner on board! wink
Thank you for posting the pics, it makes it much easier for us to diagnose any probs you may have. I would like you to post a couple more; please remove the chain case cover and take some shots of all the sprockets especially where not covered by the chains. This will allow us to see the condition of the sprockets. wink

We, with your help, will have no troubles getting your machine up and running again perfectly as, thanks to your pics....I can see the clutch probs immediately.

If you are willing to have a go yourself, as you have indicated, I will step you through the procedure.
Here are the probs as I see them:

(1) The clutch cone, in the engaged position, seem to be protruding further than it should...indicating possibly that the clutch cork may be worn past its limits (easily and cheaply replaced yourself) See this pic of mine in the engaged position, you can see it doesn't poke out as far as yours.... [Linked Image]


(2) The clutch operating fork is way out of adjustment, being way over-centre towards the engine side when the clutch is disengaged. It should be almost vertical.
See the pic of mine.... [Linked Image]


This suggests that the whole clutch assembly needs to be shifted away from the engine slightly. (ie.)the inner clutch half needs to be moved along the Briggs engine shaft slightly when we have the engine off the machine.

Before we start dismantling your machine, do you have a basic toolkit (ie.) sockets, spanners, screwdrivers etc...If not, you will need to get some. We will also need a suitable box roughly about the same height as the engine deck of your 45 to sit the engine on when it is removed from the machine...like a milk crate or similar.
If you could post the pics of the chain case, I will come up with a repair schedule for you. wink
In the meantime, see my post here, this will explain what we will be doing....Click HERE
Once again Garry, :welcome: to OutdoorKing!
cheers2

Please do not PM me asking for support. Please post your questions in the appropriate forums, as the replies it may receive may help all members, not just the individual member.
Kindest Regards, Darryl grin