Author Topic: Carbs Leaking  (Read 343 times)

Offline Integra99

  • SOHC Member
  • Posts: 207
    • View Profile
Carbs Leaking
« on: April 05, 2018, 09:07:21 AM »

Having ridden the bike a bit more.. I've noticed all the carbs have a slight leak.. I think this may be having left the tap on and parked on the side stand.

I'm sure the floats are good.. but as it happens on the side I wonder if the rubber gaskets are no good?



Any thoughts

Offline hairygit

  • SOHC Master
  • Posts: 2298
    • View Profile
Re: Carbs Leaking
« Reply #1 on: April 05, 2018, 09:27:48 AM »
Where is it leaking from, the overflow tubes or the joint between the bowl and the carb body?

Sent from my X6pro using Tapatalk

If it's got tits or wheels, it's hassle, if it's got both, RUN!!!

Offline Integra99

  • SOHC Member
  • Posts: 207
    • View Profile
Re: Carbs Leaking
« Reply #2 on: April 05, 2018, 09:38:05 AM »

It looks like the joint between the carb body..  its only when left on the side.. I guess the seals must not be doing there job.

Trouble is to get the seals I have to buy a complete kit.. !

Offline hairygit

  • SOHC Master
  • Posts: 2298
    • View Profile
Re: Carbs Leaking
« Reply #3 on: April 05, 2018, 09:42:53 AM »
If you haven't replaced them, who knows how old they are, and with ethanol in fuel these days it's well documented that it attacks rubber parts in the fuel system. There must be someone somewhere that makes and sells just that gasket, as the 400/4 aftermarket gear is probably the biggest range for any of the old Hondas.

Sent from my X6pro using Tapatalk

If it's got tits or wheels, it's hassle, if it's got both, RUN!!!

Offline Nurse Julie

  • 1973 CB750 UK K2.1977 CB550/4 Mongrel Brat. 1978 CB400/4.
  • SOHC Jedi
  • Posts: 3213
    • View Profile
Re: Carbs Leaking
« Reply #4 on: April 05, 2018, 12:25:13 PM »
Gerben sells them.
Im a Nurse, trust me, this won't hurt.....much !!!

LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
http://www.sohc.co.uk/index.php/topic,14049.msg112691/topicseen.html#new

Offline andut

  • SOHC Member
  • Posts: 157
  • CB400F, CB400F Cafe & NC30
    • View Profile
Re: Carbs Leaking
« Reply #5 on: April 05, 2018, 12:44:33 PM »
As Julie said - search for ebay seller Gerben1956 - he supplies a kit of Viton seals for the float bowls & drain screws, main jets, needle valves and carb to carb fuel lines for less than £20.  Worth also checking your float levels whilst they're apart.

Andy

Offline Integra99

  • SOHC Member
  • Posts: 207
    • View Profile
Re: Carbs Leaking
« Reply #6 on: April 05, 2018, 01:59:35 PM »
Thanks all.. I think its the seals although I changed them with the rebuild .. but looks like it can be the only thing! I'll look the ebay contact up... I  just need the seals not the whole kit so hopefully he can do separately.

Offline Integra99

  • SOHC Member
  • Posts: 207
    • View Profile
Re: Carbs Leaking
« Reply #7 on: April 05, 2018, 04:34:50 PM »
Thanks Andy, Gerben sorted me some, great price too!!

Offline Andych

  • Newbie
  • Posts: 24
    • View Profile
Re: Carbs Leaking
« Reply #8 on: April 16, 2018, 08:25:55 AM »
Good info... I have saved him in my eBay so I can get a set of viton seals before I start the restoration..
Love this forum.. so much good info :)
1975 CB400 - Project
1978 Yamaha SRX250 - Project