SOHC.co.uk Forums > CB350/400
IDLE PROBLEMS CB400/4
Nurse Julie:
Bloody hell, 107k on a CB400/4, I bet he had a sore arse ;D I think they are one of the most uncomfortable seats Honda ever produced. I suppose being a 70's sports bike Honda guessed all riders would have their bums out of the seat with knees and elbows scraping the tarmac ::) ::)
Erwin83:
If you only bench-synced the carbs, it's probably time to do an actual vacuum sync.
Weird idle definitely points to a poor synchronisation.
Clem2112:
I can get my carbs to within 1cm Hg but no better..... minimal knock after air screw adjustments.
Still think the rings and bores are bedding down after 1000 miles.
Max arse tolerance on the wooden 400f seat was an hour when I was young and supple !
Nurse Julie:
--- Quote from: Clem2112 on May 24, 2017, 02:55:08 PM ---
Max arse tolerance on the wooden 400f seat was an hour when I was young and supple !
--- End quote ---
Haha, you did well at an hour. I had my first 400/4 in the late 70's and found the seat awful even back then ;D
Norniron:
--- Quote from: Erwin83 on May 24, 2017, 01:59:40 PM ---If you only bench-synced the carbs, it's probably time to do an actual vacuum sync.
Weird idle definitely points to a poor synchronisation.
--- End quote ---
I vacuum sync my carbs every year and they still do this
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