I used it both on my 00 and 03 kx 250,My 03 only had 2 hrs on it before I switched,. the 00 had a fresh top end.I ran the 03 at my local track ,about 1.5hr time on it.In that quick of a time I was starting to show blow-by,past the top ring,not that bad,but bad enough for that short of time. Now my nephew has 2 hrs on the 00 with a fresh top end,after 2 hrs of him riding, the blow -by is substantial,well below the bottom ring.Granted he does not run the bikes like me,but the rings were sticking very bad.I drained both bikes,mixed my 927 and let my nephew put 1 hr on each bike.Pulled the pipes and believe it or not the discoloring of the piston from the blow-by was gone.Just to give you an idea,I use to run the 927 before ,I do my top ends between 45-55 hrs,Just let me say the rings are sealed with the 927,no blow-by what so ever after 50 hrs of hard use.The blendzall I was using was the original #460 Racing castor.Are you sure you can use that in a injection system?I believe the viscosity is 45 with that certain product. 927 FOR ME and I am staying.