SOHC.co.uk Forums > CB500/550
engine revs
Sesman:
I would say not. My carbs were well and truly plugged with varnish and no amount of carb cleaner would clear them. I had to resort to using an ultrasonic cleaner used in conjunction with Allan’s solution at 60deg C along with some judicious probing with a guitar string in the idle jets and passages. Result….perfect idling and throttle response. This thing can actually tick over at around 500 rpm!!!
Bryanj:
They can but by christ the primary rattles if the carbs are slightly out, i always used900 to 1000
DomP:
Regarding the passages, I've never really known which ones should exit where to know I've definitely cleared them. Some are obviously blanked off, is there a diagram anywhere detailing the routes?
Sesman:
--- Quote from: Bryanj on December 25, 2024, 10:58:12 AM ---They can but by christ the primary rattles if the carbs are slightly out, i always used900 to 1000
--- End quote ---
I know. I was simply suggesting that proof of a healthy, well set up motor is its ability to tick-over at very low revs. My optimal idle speed (quietest) is actually 1100rpm.
Sesman:
--- Quote from: DomP on December 25, 2024, 12:51:51 PM ---Regarding the passages, I've never really known which ones should exit where to know I've definitely cleared them. Some are obviously blanked off, is there a diagram anywhere detailing the routes?
--- End quote ---
.
Trick here is to use your fingers, blocking off two outlets of the three at any one time. I’m sure there is a diagram somewhere. I used it to identify the circuits in order to force fluid through the passages.
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