Airens Zoom 1944 ZTR Blades Slow Down In Bahaia Grass

spindles are seized

sounds like the coil is breaking down at high temperature. make sure the engine is not covered with grass clipping and dirt. replace the coil. i think this will solve your problem

bad valve seat needs valve job motor is overheating looseing power or under load

If there's no spark, then either the spark plug has come into contact with gas, or the ignition coil is bad. Try either replacing the spark plugs, or removing the old ones and seeing if the tips are damp.

If replacing them doesn't work or the plugs are dry, then try replacing the ignition coil.

I had the same problem twice. The first time happened when the blades were not swinging freely because they got gummed up with grass. So make sure your blades pivot easily.

The second time happened when the nuts came loose from the blade driver (the part underneath the deck that the large bolt goes through to hold on the blade assembly). I had taken the Swisher to a small engine repair place for servicing. They removed the blade assembly to sharpen the blades while it was there but put the old lock nuts back on without using any Locktight, so the nuts started to come off while I was cutting. Unfortunately, I did not notice this until after the blade driver got very loose and then got reamed out by the wobbling of the large blade assembly bolt. I had to replace the blade driver and its bolts and nuts.

sounds like it needs a good carb cleaning

I too have had that same problem. I found that "old" blades when repeatidly sharpened and worn will cause the same problem, also aftermarket blades instead of original manufactures recommended blades may not be dimensionally correct, too short. I have had to go back to using original blades to correct the problem.
This should work for you.
Good luck.

Sharpen the blades,very sharp,and lift the deck one notch from where you normally cut.Some times the blades will get dinged,or the ends of the blades will dull.

If the grass is very tall (more than 10") you will have to slow down to less than 1 mph, if you have a mulch kit on this unit, remove it to get the grass out as quickly as possible. Also, sharp blades & a level deck are important.

check belts are tight and not slipping