Tk sl400 not starting

[raffleet ser]

sl 400 . fuel in a the correct places , fuel solenoid energised ,code 61 and 43 check clutch n belts . unit cranks.

[gravy258]

is it cranking and not firing up?
if its done a lot of hours (20k +)try adjusting the valve clearances, they get tight and open a fraction so no compression.

[BRM]

clean the rpm sensor on the flywheel and try removing the fuel stop solenoid completely .These solenoids have 2 circuits a pull in and a hold in circuit , it can be hard to work out whats happening at times , so just un bolt it and turn the unit on and see if it starts
brm