The Japanese company lost the title to a Norwegian company in 2015 and has vowed revenge ever since. The current record stands at 214kph.
The new Honda Mean Mower Mk.2 challenger has twice the power of its predecessor and takes the competition to a new level, said the Japanese carmaker. And not only that, it can still cut grass.
For the new machine Honda has beefed-up the company's standard HF 2622 lawn tractor with an engine normally used for the powerful CBR1000RR superbike.
The bodywork has been rejigged and the cutter deck has been altered to fit wider tyres at the rear and twin batteries needed to spin the carbon fibre grass blades.
The new mower was built by Team Dynamics, Honda’s British Touring Car Championship partner and the team behind the original Mean Mower when Honda took the record for the world's fastest lawn mower in 2014.
"The original Mean Mower was a great challenge for us and the result was an amazing machine," said Honda UK managing director Dave Hodgetts.
"We’re in testing phase now and everything is looking good, with a top speed of more than 240kph very much in our sights,” said Hodgetts.
The tricked-out mower gets a six-speed drive train and a bespoke steel chassis. Weight has been cut and 10-inch anodised gold wheels have been shod with sticky racing tyres to ensure excellent grip.
Professional car racer Jess Hawkins, 23, has been chosen to tame the Mean Mower Mk.2 in competition but a date for the fresh mower challenge has not been set.
The current fastest lawnmower record was set up in November 2015 using a modified Viking T6 lawn mower.