SOHC.co.uk Forums > CB350/400
400F valve guides in a 350F
royhall:
feet and inches please.
Orcade-Ian:
Hi Roy,
Just sneaked out to the toy cupboard and pulled a couple of valves from this old head.
Measured just above the wear mark near to the collet groove:
Inlet 0.2160â€
Exhaust 0.2155â€
Looking in my Cycleserve manual that tallies with their table within a few tenths of a thou.
Stems are virtually the same figures where they have been in the guides.
Strange but this spare head has only got seals on the inlet side whereas the heads on both my 400’s and the 350 have seals on all valves. Is there ever enough overlap to warrant a seal on the positive pressure exhaust side? Perhaps the seal on the exhaust side just holds enough oil in there to prevent the valve drying up in the guide?
Ian
royhall:
Thanks Ian, I shall cross check the 350 valves tomorrow. They are the sizes for the 400 valves, thought I had better double check. Cheers Roy.
Trigger:
Different size guides ;)
400 Four EX stem is 5.477
IN stem is 5.480
Orcade-Ian:
Hi Roy,
Yes the sizes I have given are 400 valves.
Trig (and Roy)
Not sure where the Cycleserve info has been culled from (published Sept 1975 with permission from Honda and thanks given)
The valve stems are indeed half a thou different with the exhaust the smaller.
However, the service limit is the same for both at 5.35mm (sorry Roy, 0.2106}
These figures for the 350 are all identical to the 400 in this same manual
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400 info above
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350 info above
Ian
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