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Author Topic: 1980 Honda CB750C leaks fuel from carbs  (Read 153 times)

Offline fourmj

  • Posts: 9
1980 Honda CB750C leaks fuel from carbs
« on: Jul 01, 2017, 22:51:45 »
Hey guys, I just finished wiring my 1980 Honda CB750C and I tried to run it. The electronics work fine, but there's a lot of fuel leaking from the carbs and I'm not sure why. These carbs haven't been altered in any way since they were taken off the bike 4 years ago. They've been wrapped in bubble tape and stored in my basement since then. I also put on a new air filter (this one: https://cognitomoto.com/products/cb750-air-intake-box-sohc-and-dohc).

Here's a video of the fuel leaking from the carbs (this is also running without the exhaust pipes on, but I don't think that should matter): https://goo.gl/photos/A89gGsYWiSm1r2vk6

Any help on this would be appreciated!

Offline TheCoffeeGuy

  • Posts: 595
  • Books, Books, Books, knowledge is within
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Re: 1980 Honda CB750C leaks fuel from carbs
« Reply #1 on: Jul 04, 2017, 12:16:41 »
your floats are frozen.   Even just sitting, oxidation occurs.  they need to be taken off and stripped out and either manually cleaned or cleaned with an ultrasonic cleaner.   left alone all the rubber also hardens and does not seal.  Your floats are frozen open.
www.thecoffeeguy.ca Not your ordinary Blog site.

1968 Harley Aermacchi ML 125 Rapido, restored
1972 Honda Cl 450 engine rebuild, a day rider soon, now sold
1980 Suzuki GS850GL Street Brat  My other day bike
2000 Harley 1200 Sport S My day bike
1982 Honda CB650 Chopper light