SOHC.co.uk Forums > CB350/400

Carb Leak, Simple Fix, but Long Time Finding Fault!!!

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McCabe-Thiele (Ted):
If attempting a re-seal might be worth a trickle ring of Hondabond on the underside. (outside)

kevski:
I have in the past made complete screw in overflows.

Davelu88:
I did a test with Araldite 2 part epoxy steel , I put a hole in the bottom of an old tin , fixed it with the araldite and filled with petrol and let it sit for a couple of months . It never leaked or softened  :)

rbt1548:
I mentioned chemical steel, what I actually used was 'JB  Weld Steelstick', which I had previously used on a Monster tank hinge where it is a common weakspot, it flexes and over a period of time can start weeping, it seemed to work there so I gave it a go.

I tried it this morning and there was a slight weep still coming from it so I removed the Steelstick patch and tried to run some solder onto the brass at the join, it of course won't adhere to the alloy but seemed to flow ok, I then put some Steelstik around it, let it harden for a couple of hours and that seems to have done the trick hopefully!, we'll see in the morning.

Some Hondabond prior to covering is a good idea, I don't have any but I do have Threebond which is similar, so if it doesn't work this time I may try that. Someone I know suggested Exhaust Sealant/jointing compound, which might not seem as daft as it sounds as basically I am just trying to seal a tiny gap.

Kevski's idea is good and makes sense, but I do not have the stills to do that.

Thanks for all the advice, all gratefully accepted.

LetsRide:
I am in the process of re-assembling my CB00/4 carbs and the float  bowls were going to be fitted today. I came on to the forum to see if I could establish (beyond doubt) which way the main jets go in and saw this article. Timing could be good for me as three of the four carbs were leaking fuel out of the over flow pipes when I started this project. Assumption was that the floats were stuck in the gloop at the bottom of the float bowl (and there were signs on the floats this could be the case). I will now do a quick check around the overflow pipe/bowl joint.

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