gas leak from carburettors - Honda Forum

HondaParts | Honda Fansite | Classic Honda Gallery | Wallpapers | Classic Honda Forum

Forum Home FAQ Search New Posts Login Join RSS

Forum » Model specific » CB Four » gas leak from carburettors

Author	Message
CB Four
gas leak from carburettors
Hanken Joined: 2009-05-03 21:47:41 Posts: 1	Posted:Sunday 03 May, 2009 10:19 PM quote Subject: gas leak from carburettors I just bought a 1978 CB550, and drove it 8hrs back home. After a few days two of the carburettors are leaking fuel. Not only dripping, but it runs. When i pull over the fuel tap, it stops. I opened to see if the carburettor float valve was stuck. It looks OK from my point of view. It floats back up when i tried, and the float valve is quite loose like it should. Anyone have any ideas what this can be? I'm totally new on this, it's my first motorcycle, and i love these classics. Well, even when leaking, i had to try starting it. The sound is like a 3 cyl. engine, and it's quite hard to fire up. Anyone that can help??? RH RH
back to top
Jeremy Backer Joined: 2009-09-18 19:18:22 Posts: 2	Posted:Monday 28 September, 2009 5:56 PM quote Subject: Re: gas leak from carburettors Well it definitely sounds like the floats are not shutting off the fuel being delivered to the float bowl. This could be due to stuck floats as you stated, a bad, missing, or stuck float needle, or if the floats were bent somehow the bowl could be filling up to the overflow before the needle is closed to shut off fuel delivery. I would start by taking the bowl cover off and making sure the float needle (under the flat part of the floats) is operating freely and makes a good seat. Pull it out and make sure it is in good shape. If that's not it, I would bet on a bent float. There's a procedure in most manuals on setting float height. Good Luck!
back to top
First Prev 1 of 1 Next Last

Reply to this topic | Start new topic

Previous topic: replacing carb screws
Next topic: HONDA CB750 Four SOHC primary chains