SOHC.co.uk Forums > CB500/550

engine revs

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Morala:
Hi everybody as in previous posts i am a new owner of a 1974 550 and i am still learning a lot about the bike, what i find at the moment is sometimes when i start the bike it revs very high about 4000 revs for a short time then settles down to normal tick over, do i need a complete carb strip down or is there a simpler solution any advice greatly appreciated thanks again.

taysidedragon:
How much choke are you using when it's revving high?

Morala:
Hi taysidedragon no choke on so not sure if its a fuel problem, since i got the bike i havent touched the carbs, took the tank off and cleaned the inside of tank and checked the filter on the fuel cock, never had a 4 cyl carb bike before so not sure what to check.thanks for your reply. 

Morala:
just to add to my previous post i changed all the filters and fluids but didnt touch the plugs as they seemed to be new

McCabe-Thiele (Ted):
http://www.sohc.co.uk/index.php/topic,31510.0.html


You might find the above link relevant it's in the Anoraks Corner section, quite a lot to read, some call it a hanging throttle, at it's core is the carb synchronising starting point generally being the bench synch.

Before rushing into taking off the carbs I would want to check a lot of other things first. e.g. Are the throttle cables working correctly, is timing spot on for 1/4 & 2/3, no air leaks on the induction side, valve clearances, standard air cleaner set up, advance retard working, right plugs etc.

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