SOHC.co.uk Forums > CB750

Fork Spring / oil

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Paulreade:
Interesting feedback - thanks. I will try a thinner oil first as suggested, seems to make sense.
Thanks again for your input.
Regards
Paul

spanners:
Hi,  yes, the book says 19"  I have mine out at present 1972 750 K2  and they measure just 1/4 inch under that, which is pretty close (I'm talking inches not mm  because that's straght from the manual) either they have not lost their spring much in all that time or have been replaced at some point.  It's the seal type p/n / depth of seal (seal stiction debate) I ended up giving the most thought to on my older K2

My 1975 CB550 had progressive springs as standard honda fit.  That seemed a good idea for the 750,  but it was suggested by hondaman on the usa website that progressive springs are not such a good idea for the CB750  so I decided to stick with normal non progressive on that.

Type of oil you end up with for riding style I guess depends a lot also on how worn they are internally and is a suck it and see thing.  I think honda went to ATF because it extended seal life, but to me it is not viscoss enough maybe for older forks with a bit of wear.  Also I hear people say that 10w is the same vicossity as 10 w30 at 20C  but to me 10w seems pretty obviously a lot thinner than 10w 30  just shaking it. 

Paulreade:
I think for the price of the oil, it will be worth a bit of experimentation to see what oil has what effect. I'll report back after I have tried a couple. Spring length I will check when they are out but great to know what they should be.

Paulreade:
Just looking at various 5w fork oil types. I seem yo have a choice of classic blends from millers ( specified for vintage / classic motorcycles) to the more newer blends of fully synth and semi synth.

Does it matter if you use modern fully synth types - ie will it affect seals etc or leak past them ?.
Any advice welcome.
Thanks
Paul

Nurse Julie:
We use this in all our old Hondas [ Guests cannot view attachments ]

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