Tdc
To get TDC, take all the valve caps off and rotate the engine until you can see the inlet valves open and close again. Then look at your straw and you should see it rise. When it is at the top, adjust the clearances. If you use the 1st gear/rotate rear wheel method, you will be able to rock the wheel back and forth to get the precise point of TDC. The problem is that the piston movement doesn't equate to very much wheel movement, so you will need to practice a bit. Just keep trying until it feels right. All valve clearances ought to be slack at this point but if you've ballsed up the adjustment previously that may not be the case.
I will be very, very surprised if the figures for the two engines are any different. In fact, it's probable that all Jap big singles are the same!
Anyway, take your time and enjoy the learning process and the feel good factor you will get when you've succeeded.
I'll be doing mine tomorrow as well, so I'll post again if I come across anything tricky.
Geoff
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