Replacing Your Engine On A Scott Bonnar Reel Mower

Replacing Your Engine On A Scott Bonnar Reel Mower

The Scott Bonnar Reel Mower range, is still considered one the best mowers for a low, clean and high quality cut. You can definitely identify a lawn that has been cut with a Scott Bonnar Reel Mower.

One of the most common questions we get, is what engine would be a suitable replacement option for the 430 and 450 series models. 

The new Briggs & Stratton 3.5 Horsepower 550 Series Horizontal Shaft Engine, would be the most suitable replacement, as it has the same shaft and mountings to bolt straight on.

The Briggs & Stratton powerful 550 Series petrol engine utilizes (OHV) overhead valve design technology. It features an automotive style air filter, cast iron cylinder sleeve, and dual bearings for longer life. 

Briggs & Stratton's great reputation for easy starting and superb reliability, make the 550 Series the ideal replacement engine for your Scott Bonnar Reel Mower.

For full specs and options with the Briggs & Stratton 550 Series (3.5Hp) Engine please visit our product page here :- Briggs & Stratton 550 Series 


I have a Scott Bonnar mower with a Briggs & Stratton like the one in this picture I need a basset that goes between the cabarator & the intake pipe can you please advise as to where I can get this & the price

Thanking you
David King

DAvid KIng,

Hey there I have a Scott bonnar 45 model 450407. The shaft is 7/8 not sure if that helps. It’s a 3hp pretty sure 4 stroke. Would you know of a replacement model in your range you could point me in.

Aaron Van de velde,

Just want to say a big thanks to the guys at The Small Engine Warehouse. I ordered a replacement Briggs & Stratton for my Scott Bonnar 45 and I can’t tell you how easy it was. Great service, all the staff were very helpful and there are plenty of resources to help you if needs.

Thanks again fellas.

Cheers, Dave


Hey buddy best engine to fit onto a Scott Bonnar 43 it’s got the original 202 engine on but does not have spark anymore, cheers

Peter ,

Hi Mike – The throttle cable is not included with the engine, you will need to use your old one, or purchase a new one. The new Briggs engine and owners manual is all that comes in the box.


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