If the total payload is 170 kg including you, your girlfriend and your luggage, then you can do the ladakh journey on a 350 provided it’s in good shape. Obviously getting a 500 is much better, but my emphasis here would be on condition as the criteria. Getting a crappy 500 just because it has more cc wont get you any where, however getting a good condition 500 would mean lesser gearshifts.
Also a point to remember would be the fuel consumption; a 350 would give around 8-10kms more to liter, effectively increasing your range. Some thing which is of significant importance if you are going to Ladakh, the last petrol pump on the Manali – Leh highway is tandi 375kms from Leh.
So you should carry at least 7-8 liter spare petrol for 350 and around 10-15liters for 500.
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