I then decided to take off the carb, and cleaned out the jets. The carb was actually in very nice condition, even the bowl was shiny clean with no sediment, but I did notice a tiny leak from the thermowax assembly, so after a lot of to and froing to the mower center they were able to source the correct part from the suppliers (bearing in mind there are dozens of variations) That done I still seemed to have a problem.
I noticed the governor arm was moving backwards and forwards causing the erratic running. I took of the spring and sprayed some wd 40 on the moving parts, in the meantime I mislaid the spring, and could not find it anywhere.
I managed to find a spring of sorts that i fitted, but this kept falling off. I have now ordered a new one, that will arrive sometime in the next 5 days. I've decided that I have had enough now, and dont want to waste a second more of my life messing with it.
The alternative is, pay the mower company hundreds of pounds to take it apart and put it back together, and hope they fix it, or this could be a really simple fix for someone who knows mowers. You will need to pick this up from RG26 near Basingstoke. The item "Honda HRX 537 HYEA 53cm (21) Petrol 4-Wheel Self-Propelled Rotary Lawnmower" is in sale since Saturday, July 24, 2021.This item is in the category "Garden & Patio\Lawn Mowers, Parts & Accessories\Lawn Mowers". The seller is "xny556aforapple" and is located in Hampshire. This item can't be shipped, the buyer must pick up the item.