SOHC.co.uk Forums > CB350/400
8000RPM "sag"....
Athame57:
Could this be the throttle cables? If they are not winding it all on....... ;)
Mikep328:
Thanks! Yes, that's another thing I'll be checking!
McCabe-Thiele (Ted):
The strainer on my 400 had pretty much fell to bits when I removed it - as though it had gone brittle over time. That said your in- line filter should stop debris but if partially blocked due to strainer being holed it could affect fuel flow rate.
Mikep328:
I found the problem!
Was it ignition timing? Nope, spot on with the strobe per specs.
Were the carbs not fully opening? Nope, opening fully, no issue with the cable or synchronization.
Was there insufficient fuel flow from tank due to the strainer and or inline filter being clogged? Nope, plenty of fuel flow.
Then what the heck was it?
It was (drum roll)...
The tool tray cover!
Yep, the cover had slid back so as to obstruct part of the air intake!!! I removed it and the bike once again blasted through 8kRPM with no hesitation! The cover is probably original and has lost all its "rubbery-ness" so it doesn't grip the sides of the tool tray. Whether it slid back on its own while I was riding or I inadvertently moved it when I had the seat up, I don't know. I'd get a new one if they were available but since they don't appear to be, the tool tray cover will remain at home.
McCabe-Thiele (Ted):
I think these are 3D printed versions he mentions the lid in this listing.
https://www.ebay.co.uk/itm/301295576149?_nkw=honda+cb400+tool+tray+cover&itmmeta=01J5JWEQW0W51QDK9QSRJ55K50&hash=item46269da455:g:dz8AAOSwJnxgKDb4&itmprp=enc%3AAQAJAAABAHoV3kP08IDx%2BKZ9MfhVJKmteozDXKolEkQZX--gie0yGR%2BARdx8DT51IKJXwxBW6L4saYKJSEITs6nHCBu37vUYOpHR43YTOMg4c6HVEqcGSekotShE9PnL0aktT2ZuqIAE%2F79xXLuBGlcnOrH%2BMweyMpBUjMbWp5zLxDmZQu7WhcALGS%2FuchFv699CNd7tQqmFjjqLsJMBgpQaL9LfMryhXB6D6jj2zZSUTxRh5b9afoBtPhV5W2c54Rt9FEyxN4STEal%2BLgowqN4t1ia1T%2Fh%2Fq0MxCwNLiYY%2BX6ZE4ZuIw586sN8reAQDnSIqh%2Bj7e%2FgJlmcTogFw53eCKWtdcsM%3D%7Ctkp%3ABk9SR47-utysZA
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