SOHC.co.uk Forums > CB750

Spare Engine Rebuild.

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mick:
Evening all, i've had this engine under the bench since 2005 and have robbed some parts off it over the years, so i thought i would drag it out and start pulling it

apart & see what i had  :-\, so over the last 3 nights ive been in the shed for an hour or so  ;)

it appears to be a F1 bottom end CB750E 2544770 with F2 Barrels and Head (marked 410 on the back of the head).

Rocker cover & cylinder head came off very easily, camshaft & towers have already been robbed, head gasket just lifted off not stuck to either surface ?

Barrells came off ok to, thats when i got a nice surprise its fitted with a Yoshi 812 kit  8) bores look very good and pistons look fairly new, the top lip of the

sleeves feel sharp to the touch ? maybe been recently rebored or honed?,

so far i've stripped everything off it and split the cases no major issues so far everythings come apart very easily,

my plan is to strip all the internals clean the cases and paint them and start rebuilding the engine,

can anyone see any problems with the F1 bottom end and the F2 top end and 812 kit?,

i'm sure i'll have plenty of questions as i get into this so watch out  ;) in the meantime heres some photos i've taken so far  ;), cheers Mick.



 

Voxonda:
Hey Mick,

Sorry for that Yosh kit, will take it of your hands and get rid of it for you. LOL
Sometimes life still has some small surprises for us.
Good luck with your engine.

Cheers, Rob

hairygit:
You might find it will go even better with an F1 head, unless they are F2 specific pistons, if they are yoshi pistons for normal sohc engines, the F2 head with its larger combustion chambers will effectively lower the compression ratio. I'm not sure what markings on the pistons identify F2 ones, but if you look at some of the U.S. big bore manufacturers sites you will see one set for K0-7 and F1, and a different set for F2, the F2 ones having a higher crown to raise the compression ratio

Voxonda:
You are right hairygit,

But do not think the cr is actually lower than oem, but lower than it would be in a K-series head. The dome on the Yoshi piston seems higher than the F2's. Tho maybe the deep pockets will 'even' it out.

hairygit:
I think you missed my point there, if they ARE F2  yoshi pistons, then all will be fine, if they are K0-7/F1 yoshi pistons, using an F1 head will unleash the full advantage of the Yoshi kit, and it would be a shame not to get the full benefit of a Yoshi big bore ;D

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