SOHC.co.uk Forums > CB350/400
400F valve guides in a 350F
Trigger:
I found this interesting as, it would save some of my customers paying out for OEM ones.
Had a good measure up this morning on oem 350F and 400F and it is doable but, on the Yamiya ones it depends on how much meat they give you to ream out. And the OD of the Yamiya guide. If the OD is bigger then, a quick turn in a lathe to bring it to spec ;)
royhall:
Am going to order a set tonight. Will see how they look, I can always sell them on eBay and the 400 is a very popular bike. Trig, did you manage to find OEM exhaust guides with a seal?
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AshimotoK0:
In this parts book in my Dropbox links it shows exhaust guides for 350F as 12203-333-325 and 12203-333-335 . My 400/4 book shows 12203-333-315 Wonder what the difference is? I suspect the -335 is the guide that can take a seal
https://www.dropbox.com/s/7pieydvznvy7nhp/CB350_F_F1%20Full.pdf?dl=0
https://www.ebay.co.uk/itm/NOS-New-Honda-CB350-CB400-Exhaust-Valve-Guide-12203-333-335-/202135858908
Yamiya also have the same Genuine Part with that -335 number quoted
Orcade-Ian:
Hi Ash,
As I said in an earlier post, the 400 head I took the two valves from to measure for Roy had no seal on the exhaust guide, or provision for it (tapered a bit like the nose in the chamber) The two 400’s and the 350 I have all have seals on both inlet and exhaust. Perhaps this spare head I have with no exhaust seals is very early?
Ian
AshimotoK0:
--- Quote from: orcadian on May 20, 2019, 12:46:44 PM ---Hi Ash,
As I said in an earlier post, the 400 head I took the two valves from to measure for Roy had no seal on the exhaust guide, or provision for it (tapered a bit like the nose in the chamber) The two 400’s and the 350 I have all have seals on both inlet and exhaust. Perhaps this spare head I have with no exhaust seals is very early?
Ian
--- End quote ---
Interesting ... I have two pdf manuals, different versions for the 400/4 One shows -315 part and the other the -335 part Could it be -315 no seal, -335 has seal and early 400/4 had no seal.
https://www.dropbox.com/s/u51uf0p1dv6m29q/Honda%20CB400%20F%20Parts%20Manual.pdf?dl=0
1975 Manual below
https://www.dropbox.com/s/j0hysqub5jsfg46/400-4%20Part%20List%201975%20searcheable.pdf?dl=0
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