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Author Topic: Leaking carbs  (Read 965 times)
hawkwind
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« on: April 12, 2022, 10:32:56 AM »

Stood for 4 years.
New float valves and seats, yep.
New pilot screw O-rings, yep (had to use dentist picks to remove old ones).
New float seals, yep.
Float heights set (8mm) yep.
Fuel still dripping heavily from all four carbs.
Any suggestions people?
« Last Edit: April 12, 2022, 10:39:13 AM by hawkwind » Logged
Spurlock
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« Reply #1 on: April 18, 2022, 09:20:21 AM »

Clean everything up and pinpoint where the leaks are from. You don't mention replacing the fuel fittings and O-rings parts #2 and #3 in this diagram:
https://www.partzilla.com/catalog/honda/motorcycle/1989/cb400f-a-cb-1/carburetor-assembly


Those are most likely the problem. By "float seals" do you mean the float bowl gaskets and float bowl drain screw O-rings? Those need to be new. Also if the float bowls are switched between carbs they will not seat against the carb bodies, due to a small raised boss near the mixture screw on each carb body.

-Bill

Stood for 4 years.
New float valves and seats, yep.
New pilot screw O-rings, yep (had to use dentist picks to remove old ones).
New float seals, yep.
Float heights set (8mm) yep.
Fuel still dripping heavily from all four carbs.
Any suggestions people?
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1975 Honda CB125S2, 1989 Honda NX250, 1989 Honda GB500, 1989 Honda CB-1, 1997 Honda CB50V
hawkwind
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« Reply #2 on: April 20, 2022, 06:27:15 AM »

Cheers Bill,
I've got a full set of rings and gaskets coming from Thailand and I'll replace the fuel line O-rings as well.
I'll check bowl to carb matching very closely.
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a_morti
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« Reply #3 on: April 21, 2022, 10:34:55 AM »

Cheers Bill,
I've got a full set of rings and gaskets coming from Thailand and I'll replace the fuel line O-rings as well.
I'll check bowl to carb matching very closely.
I assume you've not been able to identify exactly where it's leaking from?
Those seals from litetek will solve it, most likely. If not, reassess from there.
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