Here is an essential and very helpful item if you are working on, restoring, riding or racing a Yamaha MX250 or MX400 for 1975 year only. This is the Engine Oil Seal Kit to help seal up the crankcase on your engine. You don't want any air leaks in your engine. This set contains both left and right Crank case seals, your Sprocket output shaft seal, Kick start shaft seal, Shift Shaft seal and Clutch seal.  Everything you need to get your bike running top-notch again.  Top quality aftermarket item. We only sell the best! This is an essential item if you are riding, racing or restoring one of these cool vintage Yamaha's!  That's is it!  Back to the garage for us!  We look forward to doing business with you!