I have a bit of a knock in what sounds like the bottom end. Stranglely the noise will stop if on the side stand or once the bike is good and hot after say 10 minute ride. Thinking there may be a lil wear in the crank end bearings. I run 20/50 Regular oil Decided to give the ZDDP additive (on order) and see if it quiets it down on cold starts and run-in. Cheap fix if it works. How much should I add, should have in a few days otherwise the bikes running great! ps: almost ordered the LiquMoly for motorbikes but the ZDDP is tried and proven especially on the older cars,no cats to screw up.Dont see a down side unless I add to much!!