Topic: '76 750F, Difference between pin, special knock and pin, dowel?

[eshumaker]

So,  I sent the cylinder out to get honed, and couldn't get some of the dowel pins out. No big deal, but now that I go to MotoGrid to scan for part numbers, the cylinder head microfiche makes reference to PIN, DOWEL (12X18) (Honda Code 0253773) requires 4, and PIN, SPECIAL KNOCK (12MM) (Honda Code 0390740) requires 8.

So, as I don't have either, what's the difference?  I only remember 2 12mm dowels on the cylinder - crankcase, and another 2 on the crankcase - head. I have already got the 8mm dowels I will need.

Any help appreciated!

E

[Jerry Rxman Griffin aka MuthaF'er]

The special knock as Motogrid has pictured (#3) I believe are for the oil returns as you will notice the gaskets, cylinder stud bolt (#2) that encircle them while the pin, dowels (#8) are for alignment only between the cylinders and head.  

Not sure if/when the earlier cylinders had all the pins. Does your head have 392 cast onto the top fin intake side beside #3? It should. If not then you may have an earlier head grafted onto your engine or an earlier top end. What is your engine serial number?