It basically depends on the person who is leasing the bike for you. i think normally they charge between 20 to 30 percent depending on the number of installments.
Simple rule is , the larger the down payment , smaller will be the installments and lesser the installments you chose , lower will be the extra amount.
In case of honda , i checked from honda dealer , he said they take advance of 35k for 70cc and 40k for 125 classic , 60k for deluxe 125. I didnt asked about 100cc . so it might also near to 35 to 40k.
But it all depends on the person who is leasing the bike for u, it depends on ur negotiations as well