@Captain_S Even 75 hp needs replacement of the timing chain. My friend who owns 2009 75 hp GP Epack + delayed it saying 75 hps do not need timing chain replacement even though I kept insisting him to get it changed. Noticing the timing chain noise, he got worried and we got it changed around 80k. In fact he was very lucky as the chain sagged beyond the tensioner support. Had it snapped, he would have had to go through the engine overhaul. After changing the timing chain, the performance was back to normal and with 1.26 on the odo, he is happy with the performance. I got the catalytic converter also cleaned along with the EGR (for 2nd time, first was at 80k) which was clogged. Pick up wise it improved so did the mileage 20 kmpl. Prior to cleaning the EGR, it dropped by a Km. As @Ganges said, 75 hp is truly value for money. Just rev it up occasionally as mentioned by Ganges.