Head issues 1970 750S

[Ernesto]

Are you sure it's a 750S?

Grimeca brakes.

 

[CLEMTOG]

can I spot silicone blocking the oil bearing cylinder studs?
CLEM

 

[peerfleuren]

can I spot silicone blocking the oil bearing cylinder studs?
CLEM

 

[peerfleuren]

No Clem, no silicone used or visible at all, also checked the oil pump, 6mm but sound and clean
Coming saturday I’ll have Gijs to look at it

 

[CLEMTOG]

third picture, with bore centred in frame of photo, bottom left and bottom right studs look full of something black, not oil surely, if so it must be bloody thick gooey sticky stuff to be still stopping there by capillary action!
CLEM

 

[peerfleuren]

third picture, with bore centred in frame of photo, bottom left and bottom right studs look full of something black, not oil surely, if so it must be bloody thick gooey sticky stuff to be still stopping there by capillary action!
CLEM

Check check Double check!

 

[peerfleuren]

Just got home from visiting Gijs this morning, I left my head there
His verdict; bad exhaust valve and the rockerarm needs replacement, other valveguides are ok. Did some polishing on the camshaft.
On his advice two hardened valveseats for the ex side wille be placed and two new exhaust valves. Also reworking valve guides for seals on the inlet side.
Bores and pistons (original) still within margins, oke for normal use.
In about two weeks I can neatly put it all together, for now I'll put new rubbers in the clutch housing and check the primary side. Also reinstall the cylinder block and Pistons and clean all the oil channels.
keep you posted, thanks for your thoughts so far.

 

[Exmoor beast]

Just got home from visiting Gijs this morning, I left my head there
His verdict; bad exhaust valve and the rockerarm needs replacement, other valveguides are ok. Did some polishing on the camshaft.
On his advice two hardened valveseats for the ex side wille be placed and two new exhaust valves. Also reworking valve guides for seals on the inlet side.
Bores and pistons (original) still within margins, oke for normal use.
In about two weeks I can neatly put it all together, for now I'll put new rubbers in the clutch housing and check the primary side. Also reinstall the cylinder block and Pistons and clean all the oil channels.
keep you posted, thanks for your thoughts so far.

Pretty much the same as what I’m doing, I’m going to do the clutch rubbers as well.

 

[peerfleuren]

next steps, rebuilding the clutch and putting the primary side together, after that the pistons and cylinderblock back in place. Waiting for the head to arrive... probably next week.

 

[peerfleuren]

Excellent work on the head!, new hardened valveseats, new exhaust valves, valveguides were okay with the new valves afterall. reworked inlet guides to have seals added. I did polish the camshaft and followers, Gijs got me a new rockerarm. Happy to put it all back together again, almost ready to let the good times roll... again.