SOHC.co.uk Forums > CB350/400

400/4 wont rev past 4000rpm when under load

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Rirons:
I have recently restored a 1976 400/4 when on its stand it revs well and seems to run cleanly but when on the road I can't get it past 4000 rpm

Has anyone got any ideas what to look for the timing has been checked and is ok

Green1:
I have had this in the past and later found the float hight to be wrong.
Have you had the carbs apart.

Rirons:
yeah refurbed them this year, thought Id set them correctly maybe not, i will check them also thanks

Johnwebley:

--- Quote from: Rirons on July 11, 2016, 04:49:44 PM ---yeah refurbed them this year, thought Id set them correctly maybe not, i will check them also thanks

--- End quote ---


  the state of the plugs can tell alot,
what colour are they?

white?  or black,both are wrong,

Rirons:
reset the float height using the correct method not the Haynes manual method which had been sued prior, they were miles out, also cleaned the plugs which were sooty, indicating a rich mixture, so weakend it by 1/4 turn, also set the timing, it runs much better but still a little slugging and also seems to have a flat spot, plugs are now a almond brown which looks ok according to Haynes manual. Just need to get it feeling like it has some power. I will check the compression.

Getting there slowly

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