Carb drains

If it's broken or just needs tweaked

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Kinsman
Posts: 1
Joined: Sun Aug 14, 2016 9:02 am

Carb drains

Postby Kinsman » Sun Aug 14, 2016 9:23 pm

My son bought a 1980 CB650c, has been sitting a few years. Buddy of his had it running but carbs were running gas out of the drains.

Replaced needles and reassembled. Floats and needle valves seemed to move freely but gas still runs out.

Ideas?

cb650
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Joined: Fri Mar 03, 2006 7:20 am
Location: Denver CO USA
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Re: Carb drains

Postby cb650 » Mon Aug 15, 2016 3:30 am

there are tiny o rings in the drains
Did you clean the tank out?!?!?!?!

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Volker_P
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Location: southern Germany

Re: Carb drains

Postby Volker_P » Tue Aug 16, 2016 12:58 am

First find out whether the drains themselves are leaky or if they leak due to overflow (leaky needle valves/floater issue).
BTW, the floater cam surfaces need to be really smooth. Sometimes they even "run in". In case of a floater (cam) issue you often can stop the leakage by carefully hitting the carb bowl with a piece of wood.
It is basically possible to mount the PD carbs floats upside down.
if you want to test your floater valves for tightness, remove the floater bowls and turn the carb rack upside down. Then blow into the fuel supply line.
Cosky's great (free) online manual: http://cosky0.tripod.com

forum links to common technical issues

If you really like this site and you would not like to see it vanish soon, have a look there: Urgent: Future of HondaCB650.com Forum


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