Newbie

[jensen]

Hi,

And now, back to business. Seen a lot of nice bikes today on the centennial at Assen (and a lot of champions too).

Be careful to copy the specifications from the manual, it's written in the old days, when leaded fuel was the way to go. Nowadays, there is no lead in fuel any more, and that has influence on the way how to machine the valves. and seats. I experimented a bit with the contact area, and found a by a specialist suggested 1 mm to 1.5 mm contact area working good.

The pictures are taken from my CB400F '75 head, which received a nice valve job.
I use the same area's on the CB72 / 77 heads, but this was easy to picture, because it was on my desk.

Jensen

[chrisnoel]

Beautiful head work. Spent a good part of the day getting the old screws out of the covers and replacing them with allen heads. Looks like I'll only have to drill out one clutch cover screw and order a few that are longer than what I have as spares.

I have the CD rom shop manual on order from the links in this web site. Any one know if this is a good reference for things like removing the cam for instance. I'm on hold at that point till I recieve the manual.

Only one shop localy will work on motorcycle heads so I'm in for a real $$$$ treat I'm sure.