M.B. Doc thanks for the help. It appears that I do not have the ratchet or later type tensioner as I can push the center piston in. The spring the dealer sold me is slightly smaller in diameter and about a half inch longer. Do you have a part number for the later style unit? Have the earlier units all been superseded by this newer style unit?

The lower chain guide was completely gone. The chain has managed to cut about half way through the lowest chain rail pin and about a third through the its partner. Are these pins removable/replaceable? Or would you leave it be?

And finally. The chain I have requires a peening tool. Do I have an option (ie circlip, fishhead clip or peened end attachment type) or do they make only one style chain for this motor? Can I peen it without a special tool?

As always THANKYOU.