Thread: Removing blade off 2 stroke Victa

Are you turning the nuts the right way? I have a feeling that mower blade nuts have a reverse thread so they dont spin off when the mowers going..

I haven't changed a mower blade in years so someone else better confirm that.

Nuts should have normal threads, cut the nuts off and use a new nut & bolt set which you can by at just about any outdoor power centre with your new blades. From memory a set is about $5 or $10.

If you can't get them undone now, it sounds like they have seized, which is common with most home used lawnmowers as they don't need doing that often.

can you take the baseplate off to get to them easier in which case take it off and hit the spanner with a hammer a few times.

if that dont work take the plate to the mowershop and they can cut them with the oxy.

The nuts on mower blades are usually nyloc nuts. They have a nylon insert captured in the head of the nut and the bolts have a couple of lugs on them that lock into a couple of notches in the blade plate so all you have to do is stop the plate turning.

I always use a ring spanner on the nuts and usually just hold the blade plate with my left hand and turn the spanner with my right hand and just reverse that if you are cacky handed.

The centre nut on the baseplate can often be left handed
As for the blade nuts they are normal, try jamming the base as before getting the supplied spanner on the nut or a ring spanner that is a correct fit and tap/wack it with a hammer, the impact force is better to get the nut to start to loosen, shock loads are far better than constantly applied ones in this case.

Changed blades on the Hondas a few times, best way I reckon is to take the whole disk off then tackle it in the vise. Good chance to give the underside of the deck a decent clean.

Tip the mower over so the carb is facing up when you do this.

Handedness of the central bolt/nut obviously depends on the direction of rotation when the mower is running. When you are looking at the underside of the deck, if the disc rotates anticlockwise when running the bolt will be conventionally threaded (right hand thread)

If the disc normally rotates clockwise the central bolt will be left hand threaded.

Agree with Russell, shock load is best to "break" the nut when undoing.


Cheers................Sean

If you have the resources available, apply a bit of heat to the bolts. Just make sure of the usual safety stuff ie, no dried grass, petrol etc. nearby

Originally Posted by Timmo

If you have the resources available, apply a bit of heat to the bolts. Just make sure of the usual safety stuff ie, no dried grass, petrol etc. nearby

Possible, but crazy idea if the disc is still on the mower.

Fuel tank within a foot of the disc, fuel or vapours possibly leaking from the mower being laid over - asking for trouble.

Best to be very clear if offering potentially dangerous advice.


Cheers...............Sean

...and don't forget to remove the plug lead to prevent it from accidentally starting.

... and also, anyone who is tipping a four-stroke over - make sure that the cylinder head isn't facing downwards. Oil can leak past the piston and into the combustion chamber - oil isn't very compressible.

had the same problem when share housing years ago. Was too hard with limited gear to get the blades off so we just kept sharpening them with the grinder. Someone will have a million reasons not to do this but it worked at that point in time (and about 30 times after that).

Originally Posted by vlv8vic

had the same problem when share housing years ago. Was too hard with limited gear to get the blades off so we just kept sharpening them with the grinder. Someone will have a million reasons not to do this but it worked at that point in time (and about 30 times after that).

When contracting, used to do this every night, especially in winter - undo the centre bolt & drop off disc, sharpen the blades with an angle grinder & flap disc, & put back on.

Used to carry a spare disc with similarly sharpened blades, easy to tip mower over & quickly swap a disc, makes the mower cut much more efficiently, esp. in the wet or on long grass.


Cheers...............Sean