SOHC.co.uk Forums > CB350/400
cb400-four speed.
Mikep328:
The red ones were far more reliable; the additional speed from the yellow ones compromised engine integrity!
OK...that's not true of course...
K2-K6:
--- Quote from: scifi on May 04, 2026, 08:33:18 AM ---Thanks Tricky Mick for the seat info. I managed to undo the lock and open the seat. The air Filter looks brand new, so I will have to investigate further.
If the weather holds today I will try some further tests. I have compared the speedo with a Sat-Nav and they are within 2 mph of each other.
Mine is a Red bike, but I have several litres of JCB Yellow Paint, if all else fails. . . !
--- End quote ---
Something that may need double checking, some years ago I had a honda that had stood for a while, that air filter looked new, but just would not flow properly, giving rich mixture and "capped" power output.
Whether it had been damp and possibly compromised, or something else that I couldn't readily explain, the result was clear and when swapped it was fine.
Tenuous link, but a possibility to consider.
Athame57:
--- Quote from: Mikep328 on May 04, 2026, 10:07:45 AM ---The red ones were far more reliable; the additional speed from the yellow ones compromised engine integrity!
OK...that's not true of course...
--- End quote ---
But is true that the yellow ones are faster, after all Dave told us so! ;D
exvalvesetdabbler:
Mine is red and an indicated 110 was regularly achievable in the 80s with my girlfriend on the bach. It was dead flat where we lived, long straight roads and no traffic.
Not sure if I would be brave enough now. Too many other idiots on the road.
The local bobby only had a hilman advenger so the best he could do was tell my dad in the pub on a Friday darts night.
That was more of a deterrent than being brought before the magistrate.
Dave
scifi:
Well after looking at the air filter beneath the seat, I removed the air cleaner top lid and went for another test ride.
This time 70 came up after about 1/4 mile straight, with more to come.
I found that the air intake was masked by the seat, as the following photo may show..
The bit between the screwdrivers is the only bit not obscured by the seat....
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