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 17in Scott Bonnar cylinder mower with a a 3hp engine what’s the cost of a new 3.5 and is possible to replace it myself … Mal

Malcolm Gill,

I want to replace my 17" Rover 45 engine. What size shaft would u recommend if I was getting a new clutch also?


I wish to replace thye Kirby 3 HP H4-5A engine on my Scott Bonnar Model 45 with the Briggs and Stratton engine if available and costs including freight to Iluka NSW 2466.
Cheers Les 0439 716 659 /

Les Roughead,

Hello I have a 33 Scott Bonnar with a Kirby motor, I want to replace motor, do you sell motors for that model, do I need to measure the shaft


Hi There
I Have just purchased a Scott&Bonnar mower with a Kirby motor H4-4A.
I’m looking to source a few parts for both the mower and engine, what is my best way?

Andrew Forster,

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