SOHC.co.uk Forums > CB750
Water coming from exhaust
UK Pete:
I now have my rebuilt f2 engine running smoothly , but i have a few leaks one is from the neutral light switch, an easy fix i think, but the other is a huge amount of water pissing out the exhaust collector box join, i can not believe how much comes out, i have noticed a bit here and there on my K1 but this is lots on the F2 , i cant take the bike for a ride yet as i have cut the frame and need to instal a frame kit so i can ride it, i suppose its crying out for a long run to burn it off, all the stop and starting is not that good for iti suppose
Does any one elses bike do this?
Pete
Spitfire:
Until the engine/exhaust system gets nice and hot you will get this, water is a product of combustion, this is why I do not start up my bike unless I am going to get it to full working temperature.
Den
the-chauffeur:
Pete
Neutral light switch leak is either the O-ring or the internal sealing plate. The O-ring is a slightly odd size - 18mm x 3mm - which is the same as the one that goes round the oil galley feed tube inside the front of the engine. If you've used a generic o-ring, chances are it's 18mm x 2mm or similar and isn't sealing properly. If it's not that, you'll probably need to look for a replacement switch 'cos they internal plate isn't repairable.
As for riding the bike, see my notes in the oil flow post. Riding the bike around without the removed frame section won't cause you any trouble.
Spitfire:
If I remember rightly the tab that retains the neutral switch can go on two ways, get it wrong and it will not seat correctly, I had a problem with this.
Cheers
Den
UKROBK7:
Nearly all my bike have done this, I found it worse on bikes that have 1 exhaust per cylinder as it takes longer to warm up. On a Shadow (NOT a Vincent!) that I owned the silencers were inclined upwards, I was told by a honda dealer to drill a hole at the lowest point of the system to let the water out to prevent the system rusting through on short journies.
Rob
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