Posted by NoNewParts on August 24, 2018 at 04:30:46 from (72.230.145.215):
In Reply to: Too much for the 640? posted by Grandpa love on August 23, 2018 at 15:52:00:
agree with the others that your 640 should destroy the mower before that engine would give up.
Flush the entire cooling system, the block gets rust and scale deposits that can give you overheating problems.
Without a thermostat, looking in the radiator neck should show very violent water movement if your pump is good.
make sure your engine is running good, paying attention to timing.
Make sure your advance mechanism is working. (most old tractors I buy, the advance weights are rusted stuck) Without the advance the timing will be far retarded at speed = no guts, and Lots of engine heat.
On your finish mower, adjust the wheel spacer blocks (looks like you're missing some) for a little higher cut. On my side yard with very heavy clover I run that mower a little higher. Freshly mowed....no one notices the difference between 3" high or 5" high grass.....
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