Author Topic: Fuel resistant gasket sealer  (Read 164 times)

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Offline thebearded1

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Fuel resistant gasket sealer
« on: February 08, 2019, 05:32:22 pm »
The bike is a 75 cb550 stock carbs, I had a leak on one of my carb bowls and pulled them off and replaced the gaskets with Honda OEM gaskets and added Allen head bolts for the bowls. Put everything back together and the bowl is still leaking from the seam where it meets the carb.  It looks to me like the gasket is too narrow/ the groove in the bowl is too deep.  Anyone else ever have this problem?  Does anybody have any suggestions for a gasket sealer that is fuel resistant I could add in the groove to place the actual gasket on top of?  I ended up having to do the same thing with the oil pan but didn't have to worry about gas then.  I've seen recommendations of Hondabond and ThreeBond 1184 any one have any experience with these?  My other thought was too place the bowl gasket edge down on sandpaper but was worried about it getting uneven.
Threebond 1184
https://www.magicracing.com/shopping/item/6675698/threebond-liquid-gasket-1184

Hondabondhttps://www.amazon.com/Honda-Hondabond-4-Motocross-Silicone-Gasket/dp/B00AIDINP8/ref=sr_1_1?s=hi&ie=UTF8&qid=1549674561&sr=1-1&keywords=hondabond
75 CB550K

Offline BRG-BIRD

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Re: Fuel resistant gasket sealer
« Reply #1 on: February 08, 2019, 06:40:27 pm »
Maybe some Permatex or Blue Hylomar? I would be hesitant to use any of that in the possibility some could get into the pilot jet. Seems weird that you are having this issue.
“You are either on something or onto something.” The Comman Man

Offline bryanj

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Re: Fuel resistant gasket sealer
« Reply #2 on: February 09, 2019, 01:22:18 am »
Fuel level should not be high enough to leak at the floatbowl gasket so check needle valve and float height first
Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!

Offline thebearded1

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Re: Fuel resistant gasket sealer
« Reply #3 on: February 09, 2019, 04:57:45 am »
Thanks will do hopefully it warms up some this weekend
75 CB550K

Offline DaveBarbier

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Re: Fuel resistant gasket sealer
« Reply #4 on: February 09, 2019, 05:13:18 am »
Something seems wrong. Everyone else’s bowl doesn’t leak so maybe you’re pinching the gasket as you install, you’re getting the wrong gaskets or there’s a gouge in the surface of the bowl or carb. Possible you have an incorrect bowl on those carbs which require a different gasket?

And +1 on the fuel level shouldn’t be high enough to leak at the seam unless it’s sloshing around and leaking or the bike is on the side stand.

Offline TwoTired

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Re: Fuel resistant gasket sealer
« Reply #5 on: February 09, 2019, 09:48:02 am »
I have been using Gascacinch on my carb bowl gaskets for the past 30 years.  No complaints.

Cheers,
Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

Those that learn from history are doomed to repeat it by those that don't learn from history.

Offline rosewood

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Re: Fuel resistant gasket sealer
« Reply #6 on: February 10, 2019, 04:33:53 pm »
Check to see if its not the 'T' joint where the fuel feeds each pair carbs....took me a while to figure that one out..it was slowly leaking down and looking like it was coming from the bowl seam....if your floats are right like others have said it shouldn't be leaking from the seam at all.

New o rings on the T joint fixed it...

 

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