New Member Intro

[MICK CLARKE]

Hi Mick Clarke here in the sunny south,well Gosport to be exact. Current collection of bikes 1978 CB750 F2,in cafe racer guise, 1975 T140 Bonnie also in cafe racer guise, 1964 Thunderbird in state of repair, 1969 T120 pretending to be a T120TT. 1969 BSA Lightning.
Retired so probably spending far too much time in the garage. Finished the CB750 was a full rebuild from the frame up,ran well for just over a year and now seems to have developed an appetite for head gaskets consistent leak from front left between #2 and #3.
Just about to remove the engine for a third time,good job I am retired I guess.
Guess that about covers it I am sure I will be saying more in the future.
Cheers
Mick

[Trigger]

Welcome to the mad world of the SOHC, try a OEM head gasket and up graded O'rings.

[MICK CLARKE]

Thanks for the welcome Trigger, an OEM gasket is winging its way as I speak,but a point in the direction of upgraded O rings would be appreciated.
Mick

[mick]

Hi mick and welcome to the forum  , post some photos of your bikes when you get chance, cheers Mick

[UK Pete]

Hi Mick welcome aboard fella
pete

[philward]

Welcome Mick - I done a lot of research on the o'rings in the head/barrel before rebuilding my K2 and got a lot of info from sohc.net sister site. Can't remember detail now but try that site. Seem to remember slightly bigger o rings.
I've done about 500 miles and engine is totally leak free.
Phil

[MICK CLARKE]

Hi Mick   Phil
Mick pics posted except for the Thunderbird as its not yet finished and somewhat buried due to some alterations to the garage,but will post when done. Phil will check on the O rings on the other site,but I have had the head skimmed by 6 thou and the block by 2 thou so effectively increasing the thickness of the rings by 8 thou and it still leaked after about 20miles. off with its head again this weekend and a session with some crack detecting dye is in order.
Cheers
Mick
 

[royhall]

Welcome Mick. Are you sure its the o-rings and not the 'Pontefract Cakes' that cover the bolt holes. Those leak into the plug area and are much more common than o-ring/head gasket leaks. They seal best with a good smear of HondaBond. Just a thought.