if you are running 2 wheel drive 540 will be fine,if you are running 4 wheel drive it will be ok but you may find the motors and esc get hot,moving to 550 motors keeps the temperature down and give loads of torque,i have run my Hong-nor with both motors,personally prefer the 550motor as the pinions are mod 1 size so idealy suited to the 5mm shaft of the 550 motors.
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Xray XB4 ,savox,speed passion 5.5
Losi 22sct,savox speed passion 10.5
Yokomo b-max 2mr,savox ,speed passion 7.5 
vbc wgt 10,skyrc toro 1s, 10.5
Losi 22 2.0sct,highest servo,speed passion 6.5
yokomo yz2,highest servo,skyrc 7.5
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