OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Walk Behind Lawn Mower Frames Question On Scott Bonnar Cylinder Mowers Scott Bonnar Model 45 - 450431

Hello all, I recently acquired an old Scott Bonnar that was on it's way to the tip. No way, if it has a motor I want to play with it first, so it is mine now!

So I bring this contraption home and get the pressure washer onto it and start checking a few things. I 'tipped' the foam out of the air filter as it had all disintegrated, checked the oil, cleaned the spark plug, gave it a drink of petrol and began pulling on the starter rope. After the 20th pull the rope snapped and then I had to figure out how to pull that apart and re-fit the rope. Another 20 pulls and it fired once, all the time trying different positions for the throttle and choke and another few pulls and it fired 2 or 3 times and soon after it started !! I engaged the dog? clutch and the cutters were working and pulled another lever on the handle bars and away we went ........ self propelled ! I ran it for a while and warmed it all up, drained the old grey oil, threw some old oil in it and warmed that up, drained it and filled it with some good old HD oil. Next on the list is a new spark plug and check the valve clearances and points.

The info I have from a couple of stickers are as follows .....
Tecumseh Kirby HK30 (3 hp I presume) Serial No- 0061 1589. Spec no- L1259. Mower No- 45 14407 and it has a 20" cut. That is about all I know at this stage, but it runs well and cuts well although I certainly do not have a good lawn to try it on. The only thing missing is the little knob on the gear lever and the catcher. I have found manuals for lots of other model engines but not this one (HK30). I have also found a catcher on eBay, but I'm in no rush.

Mick.

can uload some pics of your 20 inch s/b 45 mate regards steve...

Here are some pics (hopefully)I took this morning. BTW, it started on the second pull today !!

And here are the other 2 photos.

Hi Mick, here is a little info I have found on your Scotty, hope you enjoy, mate.

To view the pic and read the text, and enable the zoom in function, Just right click on the image, select view image, and left click to zoom in....Use your back button to return to the forum
The Scott Bonnar Model 45 has proved to be an outstanding and has continued to be produced by Rover/Scott Bonnar Ltd for over 30 years.

Thanks for that Deejay, that's exactly what I have.
My wife and I are heading off for a trip around Australia on our motor bike in 2 weeks time, so I haven't been fiddling with the mower very much ....... I will save that for when we get home, but, I did pull the carby off this afternoon and found lots of dirt and build-up inside it and it is all nice and clean now. I found this link ....
http://www.lawn-mower-shop.com/carb1.htm after I had it all back together and it shows how to set the float. When I had it apart and upside down the float was resting on the carb body. This didn't look right to me so I set it about parallel with the body and it now runs a little better. After idling away for anymore than a few minutes it would just stop, but start up straight away with a quick pull on the rope. Now I think it would sit there idling away all day if I let it. Also the plug used to be a bit wet, and now it looks good after a run.

Mick.