SOHC.co.uk Forums > CB750

help...leaking overflow...again

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whiteylfc:
i'd considered that......infact I've looked at using a lump hammer on a few occasions!!!!!

Waggles:
I think, as has already been said, that regular useage is key. Modern fuels evaporate more quickly and leave sticky residues that you can't see. Regular 'washing' with fresh fuel ( ie regular use ) helps a lot. When I first got my F1 on the road being a 'Born again biker' of, er, mature status I took things carefully, used it only a little when it was dry (ish) and experienced similar problems and smells of petrol in the garage. Now I use her daily all seems cured.

Can't help wondering whether teflon coated needles / seats would help for those who can't use daily? no idea if such things are available or possible but maybe a different type of float needle would be an idea? I have seen some with metal tips and others with rubber like tips over the years, are there others?

whiteylfc:
thanks mate...unfortunately its in showroom condition(or was!!!)so it doesn't get used as regularly as it should.i listened to some of the advice above and kept it on the mainstand and it didn't overflow when I next fixed it up....result!!!!

K2-K6:
You seem to be on the right track with parking it on the centre stand as if you turn the fuel off before you get home it should then leave all of the four float valves in an open postion and also dry of fuel  so that they operate normally when you next use it.

If you don't turn the fuel off before journey's end, then leave it to stand at tickover with the fuel tap off before switching off to lower the fuel level in the carbs.

Critical for the F2 carbs (as they have an accelerator pump fitted) is not to blip the motor as you switch it off (some people habitually do this) as it pumps neat fuel into the inlets that won't get burnt off during higher engine speeds, it'll also promote internal exhaust corrosion as well if left in there.

For bikes like this that have expensive/rare exhausts, the hotter and drier they are when switch off for storage the longer they will last.

whiteylfc:
thanks mate....all good advice....

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