@sarbanoxley- Blocks in both the manufacturer are supplied by same supplier. So both the blocks have their quality improved. But go for hero block and not unicorn as it is difficult to get and they don't sell outside and you cannot give them for servicing as they service only Honda bikes. And also the piston top is different in extreme as it aid in tumble flow of mixture and has higher compression than unicorn piston. Achiever and unicorn has same piston.
Go for new extreme bore kit as they have provision for swirling of mixture and thus your performance will improve. Even in this condition if you are getting 55 kpl then after bore kit replacement it will get even better and remember to do 1000 km run-in more carefully in case of replacement bore. Also check that connecting is making noise or not and don't ride much in low compression otherwise it will cause play in con - rod.
Chennai xbhpians please help him in getting a good mechanic where he can sit and do the work done. It will not take more than a couple of hours.





- are the new blocks better in unicorn or Xtreme mate ? if it was the former can i use the bore+block+piston of uni in my Xtreme ?
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. Finally some relief, i thought something went wrong with the engine and i shouldn't have been that harsh with my ride but most of us do such speeding once in a while.isnt it
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