Author Topic: gas leaking everywhere! (Read 1537 times)

75 super sport · « **on:** May 13, 2015, 09:42:03 PM »

Fired the bike up for the first time, gas leaking from everywhere. Coming out of the fitting that shares fuel with 1&2 and 3&4. Pouring out of #3 as well. Had them rebuilt last year but that sat around until now. Not sure what to do. Rebuild them again? Any suggestions on what may be going on?

Davez134 · « **Reply #1 on:** May 13, 2015, 10:04:54 PM »

The fittings have O-rings, replace. Float may be stuck on #3 or float needle/seat may be worn or have debris in there. Try this first before just rebuilding everything.

75 super sport · « **Reply #2 on:** May 13, 2015, 10:12:01 PM »

Do the o rings for the fittings come in a rebuild kit? The kits are fairly cheap

Davez134 · « **Reply #3 on:** May 13, 2015, 10:38:03 PM »

Without looking at the specific kit, I couldn't tell ya, but usually no. There are 4 rings on each fitting, you will need 8 total, and I believe they are 2mm thick x8mm diameter. Waaaay cheaper than a complete rebuild kit.

75 super sport · « **Reply #4 on:** May 14, 2015, 04:27:49 AM »

Do you know where I can find them?

Davez134 · « **Reply #5 on:** May 14, 2015, 04:51:37 AM »

Harbor freight oring kits, any hardware store that sells orings. Not hard to find.

70CB750 · « **Reply #6 on:** May 14, 2015, 04:57:00 AM »

I took mine to Lowe's and found the right size of o-rings.

The HF o-ring kit is a great thing to have too.

Johnie · « **Reply #7 on:** May 14, 2015, 05:24:09 AM »

NAPA o-ring part number 727-2605. The only way to replace those is to separate the carbs which why some people take short cuts and don't change them out.

flybox1 · « **Reply #8 on:** May 14, 2015, 06:55:31 AM »

As these orings only contact fuel, and are not exposed to excessive heat, at a minimum, use BUNA-N, orings.
VITON(FKM) are also fuel resistant, but have a higher heat rating.

75 super sport · « **Reply #9 on:** May 14, 2015, 07:10:22 AM »

So the ones from Napa, are they ok to use?

flybox1 · « **Reply #10 on:** May 14, 2015, 08:01:26 AM »

Quote from: 75 super sport on May 14, 2015, 07:10:22 AM

So the ones from Napa, are they ok to use?

i dont work at napa, so i dont know. guess youre going to have to ask

use buna-n or viton, only....

Duanob · « **Reply #11 on:** May 14, 2015, 08:57:17 AM »

Am I the only one that doesn't know what bike he has? 75 all three sizes came in Supersport models. I would just buy the Honda gasket carb kits for $15 each. Then you know you will have all gaskets and o-rings made of quality material in the perfect sizes. They are readily available for the 550F carbs, probably for the 750F, not sure about the 400F.

Most guys will tell you not to sepearate the carbs but it's not rocket science and I always feel better knowing the fuel 'T' orings have been changed. Plus its easier to change out the fuel lines when the carbs are seperate and the fuel T removed.

75 super sport · « **Reply #12 on:** May 14, 2015, 09:54:08 AM »

75 cb750f. I bought 4 carb rebuild kits and a bunch of Vinton 8mm x 2mm gaskets for the "t"s. Should work eh?

Duanob · « **Reply #13 on:** May 14, 2015, 10:00:46 AM »

Quote from: 75 super sport on May 14, 2015, 09:54:08 AM

75 cb750f. I bought 4 carb rebuild kits and a bunch of Vinton 8mm x 2mm gaskets for the "t"s. Should work eh?

The kits didn't come with the T orings? Strange.

75 super sport · « **Reply #14 on:** May 14, 2015, 10:14:23 AM »

No I don't believe so

Johnie · « **Reply #15 on:** May 14, 2015, 11:18:46 AM »

I have only used the NAPA o-rings. My KO has had them in now for 9 years. They will be fine.

Bodi · « **Reply #16 on:** May 15, 2015, 08:15:19 AM »

The Honda OEM carb gasket kits come with the crossover o-rings. Not as cheap as aftermarket kits, or just getting o-rings locally. You do get the cap gasket and a bowl gasket o-ring as well. These OEM parts are not 100% ethanol resistant as of the last kits I bought, mid 2013.

Duke McDukiedook · « **Reply #17 on:** May 15, 2015, 09:25:19 AM »

Go with Viton if you can.

75 super sport · « **Reply #18 on:** May 15, 2015, 12:19:56 PM »

I got some Viton o rings on the way

so what would make the carb fill up and over flow out of the intake side of the carb and flood into the motor? Brand new top end with 836 big bore and I really do not want to harm the motor!

Duke McDukiedook · « **Reply #19 on:** May 15, 2015, 12:42:33 PM »

Leaky float valves. I just shut off my petcock when I park it for more than 5 minutes.

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Author Topic: gas leaking everywhere! (Read 1537 times)