G80/85CS cylinder heads

[mdt-son Profile]

Hi

For the 1960 season, combustion chambers were reworked for G80, G80CS and 500/650 twins. For 1964, the G80CS cylinder head was reworked again (026702 -> 031623).
I have seen pictures of the later one - there are some changes to the casting in the spark plug area - but what are the finer points? The late number indicates this was a modification made for the G85CS works machines at first.
Was the firing slot finally abandoned and a 10mm plug fitted?

Cheers,
Knut

[bjorn Profile]

'65 CS cyl head.JPG

'58 and '65 CS cyl heads .JPG

Hi Knut,
Here are pictures of a 58CS and 64CS heads. I have two other heads similar to the 64CS, one off a 1968 G80CS and one off a G85. They all use 14mm plugs.

regards
Bjørn

[Marty Profile]

'64 and later had 1 3/8 inlet port standard and inlet valve has 5/16 stem also

[ajscomboman Profile]

Marty, you made any progress with the CS issues you were having?

[Marty Profile]

Different Marty. You are after the Australian, not the Kiwi. As an aside, I attended the Oz Jampot at Boonah, Qld. Met Marty and his problem children. I think he is very close to having both sorted, or as close as one can.

[ajscomboman Profile]

Different Marty. You are after the Australian, not the Kiwi. As an aside, I attended the Oz Jampot at Boonah, Qld. Met Marty and his problem children. I think he is very close to having both sorted, or as close as one can.

Of course it is, sorry I should have realised by the way you're still beating that bloody animal!!!!

Still it's nice to hear that progress has been made.