flooding carbs

[RGP750]

Hi strangers not been here for a while .
Almost have the gold 500 back on the road (yours Steve)
carbs totally stripped and ultrasonically cleaned put back together with new float jets and housings. and seals
floats set at 22mm bench tested for leaks and two ctr overflowing . Tried just tapping float bowls ,still leaking .
Took bowels off and result one of the overflow tubes is leaking . all floats are free.
Change for another float bowl
now they are all overflowing Grrrrrr! any thoughts please

[SteveD CB500K0]

I was beginning to wonder what had happened to you Rich!

FWIW, I could never get them to stop leaking either.


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[RGP750]

Hope to have it on the Road next week Steve,
There was only one leaking when I got it from you and I recon that was the one with the split tube .
Hope I can sort it with one help on here.

[K2-K6]

Check the seat area that the taper valve closes onto.  If you've changed them they can have tool chatter from machining operation. Look with magnifier to see what they're like.

A wooden dowel sharpened to a taper,  fine cut grinding paste,  put dowel in vice and spin brass valve in drill chuck to clean the finish in there.

[RGP750]

Thanks guys
Thats tomorrows next stinky job then .
I'll report tomorrow night ,fingers crossed
Cheers

[Woodside]

Good luck rich.
Has anyone heard from gerban recently.
I've sent a few emails recently about various things  with no reply .?

[RGP750]

Up date
Did the reseating excersise and just the odd drip every 5 mins
from 2 and 3 but every now and then no 2 drops about a thimble full and then stops. Weird!!
Blasted round float bowl 'o' rings get 5mm longer when they get petrol on them had to hang them in the sun for an hour to shrink back .
4 of the bowl screws also needed tapping out to 5mm, thought I might get away with it yesterday but after a nights sleep thought I need to do it properly .
Plan to have another go at 2 and 3 again tomorrow so hopefully nearly there.

[Nurse Julie]

Up date
Did the reseating excersise and just the odd drip every 5 mins
from 2 and 3 but every now and then no 2 drops about a thimble full and then stops. Weird!!
Blasted round float bowl 'o' rings get 5mm longer when they get petrol on them had to hang them in the sun for an hour to shrink back .
4 of the bowl screws also needed tapping out to 5mm, thought I might get away with it yesterday but after a nights sleep thought I need to do it properly .
Plan to have another go at 2 and 3 again tomorrow so hopefully nearly there.

Can I offer to sell you a full Viton carb O ring kit Rich, it will save you having to hang your bits out to dry in the future 🤣🤣🤣🤣

[RGP750]

you could have said that when you sent the screws
How quick can you get them to me then?

[Nurse Julie]

you could have said that when you sent the screws
How quick can you get them to me then?

I have the kits in stock, can post 1st class Monday and if Royal Mail do their job, you will have them Tuesday.

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[RGP750]

can you do just the float bowl ones? ,don't really want to take the whole things to bits again

[mattsz]

I used to test mine by connecting a fuel source up to the fuel pipe and holding the float jet up into the seat with my finger, if fuel got past then I'd replace or repair the jet/seat. I'd then reinstall the float and hold it up with my finger and see if it leaked then. Checking them on a bench with fuel is far better then hoping they'll not leak on the bike, it's messy, it stinks but it works for me. I'd lift the float up until it just touched the sprung pin, if it stopped the fuel flow then I'd be confident it would do so when installed on the bike.

Can the float valves be effectively bench-tested this way using something less stinky than actual fuel?  Maybe mineral spirits, or even better, alcohol?