'73 DT3.

What controls the end play of the drive shaft for the oil pump?   When the clutch cover is off, and the driveshaft is inserted into the pump, through the cover and seal, the pressure from the seal around the shaft holds it in place. Is that all that controls the end play of this shaft?   

 It shows a washer No7 but i can't see how that can run against the seal. So where does it go!!. Can't go on 'this' side of pin 3 as pin inserts into the plasic gear. Does it go against the spiral drive?, anybody, "Deet" expert. I'm only an expert on premix haha. Fitted against spiral would controll end play for sure if it doesn't get in the way of anything. I don't know. i guess a very little running clearance is normal but howmuch is too much. We love videos. Thanks.

#4 in the diagram is the one that has me puzzled.

There is a flat washer #7, and a C-clip, #6. But there's no bearing #4 like in the diagram. The shaft slides through the clutch cover and through the seal #5, and then the circlip, washer, pin #3, nylon gear, star washer and nut. The diagram is misleading cause the pin engages the nylon gear.

Maybe I'm thinking too much on this and the shaft #2 is supported by the case and the bearing surface in the pump and the shaft can't really walk out of it's recess.

#4 is a stepped bushing pressed into cover from oil pump side.

okay, that makes sense then. Thanks for the clarification

the most important thing, in my unsubstantiated and unwarranted opinion, is to get pump set up properly and to then verify its output at idle and full open against the correct spec. I have had one or two bikes that sat forever and put out perfectly and several others that fell way short and needed to be resealed.

ps. I do this by running on 25:1 premix so I can have pump output hose(s) (I have a couple of twins) into a small graduated cylinder that I got on Amazon.

If they call it a bearing it's just a cast bush. Gets plenty of oil of course.

Did anyone decide where 7 goes though coz it sure won't run against the seal.

E-clip in shaft groove, then washer 7, then pin through shaft, then gear (locks onto pin), then star washer, then nut is how I remember it.

6 is hard to see but must be the e-clip.

That's exactly how it goes.   Once the nut is on and tight, there's nothing to stop the shaft from walking out away from the pump.
The only thing I can think of is that since the gears are helical, the thrust of the shaft when turning is toward the pump and that prevents it from walking out.