Topic: Leaking carb question

[andy8190]

cb350f with foam floats for reference of the post

I have done my research on this but wanting some opinions. I have a carb that is leaking but seems to be only when on the side stand. I think it is either:
1. sticking float due to the pivot pin being too small because I made my own using brass shirt hanger.
2. possibly the float not floating like it should
3. bad adjustment of float
4. crack in drain tube

I do not think it is the float valve, it is new. I am going to check the drain tube this weekend for a crack, as well as check the height adjustment on the float again.

What I would like some suggestions on are:
1. Anyone know a source to buy just the pivot pins, or a better way to make my own. If I make my own I would like to be able to buy the part some where local and not have to order online.

2. Is there a proper way to check if the floats are floating correctly?

[calj737]

Clear Tube method.

Drain bowl closed to measure height. Motor running to measure fluctuation.

[andy8190]

I can't do the clear tube method bc a couple of my drain screws striped the threads so I had to jb weld them closed

[calj737]

You need to replace those bowls then. You have bolloxed yourself 

[andy8190]

I don't understand why they are bolloxed? the drain screws are only there for draining. If I have to drain them I just take the whole bowl off. I will agree it is more hassle but I dont want to pay 40 for a bowl

[BobbyR]

Well you did limit your options. The clear tube method is the best for checking fuel height in the bowl. If you find a cracked tube inside, PUT DOWN THE JB WELD.  You can clean them and use solder. Solder is a permanent fix. Forget plastic tubing and any other crap you may be told. Just plain solder.

[Flyin900]

With all the little fixs you have done there is no wonder you are having issues with the carbs. Since these use a metal on metal system for the seal in the float needle assy they need to be bang on with correct alignment and fit.

Find the correct parts as suggested with replacement bowls and correct float pins. Ensure the floats are correctly aligned in all axis and not twisted and then set to the proper height per the FSM.

Aftermarket kits are usually the worst for leaking and best to use the stock Honda ones if still good and it not buy replacement OEM Honda for the easiest fix.

[andy8190]

The only problem I have with float pins is that you can't buy just the pin

[Flyin900]

Harisuluv on this site may have some parts available, as he is a carb specialist/rebuilder based in the US.

I have done numerous CB350/400/550 carbs and they need to be on spec and with good floats and needle valve assemblies, or they will always leak a little from one or two carbs.

I am based in Canada, yet if you are really stuck for parts I can sell you a couple of bowls and float pins I think. Would just need to know the bowl positions and check my parts stock.