Like Rob said, free horsepower if you look after and lube your chain properly. I used to see 3-4 hp by changing a worn out chain for a new one on customer's bikes. A worn dry chain also has more chance of breaking and destroying cases, just like an improperly installed rivet link.Originally Posted by LMsports
Friction robs horsepower. Another thing I used to do, is if possible, is lube the chain when its hot as it will reduce the 'lube fling' as the lube will set a little. Motocross trick from back in the day :wink: