SOHC.co.uk Forums > CB350/400

fuel starvation?

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yorky10:
hi ,yorky again[R regd400-4],all new carb needles, jets,floats reset,21cm as per the book took apart again,air line in every orifice,timing checked new plugs,now it fires touch of button revs up for a few seconds,dies out.its on its last chance,any ideas.very tired,large scotch later things don't look any better.yorky

Norniron:
Is your tank vent clear?

yorky10:
Yes,i have not fitted it yet,?yorky

hairygit:
How about the internal filter on the tap, is fuel flowing fast enough from the tap? Unfortunately cleaning the filter on the tap involves removing it from the tank >:(

PatM:
Yorky- Did you solve it? Im going back through old posts as I have a similar issue. The bike starts on the button, but has no power after 3k, coughs and splutters as you give it some gas. So, I REPLACED the carbs with some I had rebuilt, new everything. Still the same. I had the fuel tap off a while back and cleaned the filter- Ive even put an inline one it, as I suspected fuel problems. There seems to be a healthy steady fuel fill from the tank, so Im sure its no longer petrol starvation. I cant imagine its points, as I checked them and the timing a while back and it was running fine. I just hope its not something more serious, like a burnt-out valve.

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