SOHC.co.uk Forums > CB500/550
500 four reluctant to rev
mickwinf:
Will experiment further thanks for suggestions
K2-K6:
Usually, when supply gets restricted, the longer it's ridden the worse it effects as float bowls aren't replenished at sufficient rate to fill demand.
Backing off power can then bring them back toward correct level and keep running.
A plain ceiling that occurs always at 5000 rpm suggests more toward timing of ignition/ cam etc to cap any advance in higher rpm use.
exvalvesetdabbler:
If you on a mechanical advanced/retard are the bob weights free to move or get a strobe light on the timing and watch the advance as revs increase from idle.
Second thing if you can get your finger up the carb inlets and feel that the slides are fully open when the throttle hits the stop.
Regards
Dave
mickwinf:
I am sure the electrics are good as all new or reconditioned. Might have a bit of time to check in next couple of days.
nairb:
I put a new after market air filter on my cb550 k3 and it ran very poorly. For some reason the old genuine honda filter works best.
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