First, I'd check that the 35mfd cap is the right one for this saw. Could have been changed at one time with the wrong size.
If the 35mfd is right you can try a higher voltage capacitor, replace your existing one with that. Just keep the mfd rationgs the same and it will work fine.
But, 440 is the higher voltage caps I'm familiar with so you might not find a higher voltage cap available.
Sometimes two caps are used together on motors drawing large starting current. This divides the voltage between the two caps and puts less of a strain on each one. To do this, find two capacitor's whos mfd ratings add up to the 35mfd (Such as a 25 and a 10) and wire them in parallel.
to original cap terminals | | | | |--||--| -->25mfd cap | | | | '--||--' --> 10 mfd cap
The motor appears to be a capacitor-start, capacitor-run type. The run capacitor is the one that is failing, so make sure that the replacement is rated for continuous duty, not an electrolytic type, which is normally rated for intermittent (starting) duty.
Definitely 1440 RPM motor is designed for 50Hz. Capacitor and motor inductance makes resonance circuit and if motor is runing on 60Hz, it is "closer" to resonance. Voltage on "run capacitor" is usually higher than line voltage (commonly known effect with resonance circuit) and closer to resonance can be twice or triple higher than supply voltage. There I see the main reason for damaging of capacitor. Proper determination of capacitor needs engineering calculation. Ask manufacturer. Andre
The original thread was posted from Kuwait, which is 50 Hz. So RPM sounds right. What is the failure mode of the capacitors? Are you sure the motor doesn't have a problem? If the original cap failed to ground the motor's auxiliary winding would have been damaged. First thing I would do is read voltage across this capacitor while the motor is running. The proper voltage should be about 400. And be sure it's the right capacitor. Running caps are most often oval and in a completely sealed aluminum can, which may be covered with paper. Starting capacitors are usually round and the terminal end has a pressure relief vent since they are electrolytic.