1982 550 carb t-fitting fuel input
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#1: 1982 550 carb t-fitting fuel input Author: fjpish, Location: New Jersey PostPosted: Mon Sep 08, 2008 5:45 am
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My Mikuni carbs leak fuel from the t-fitting input. The manual says it requires o-rings but upon removal, ther are no o-rings and it appears to be a self-sealing, rubber-coated part. I spoke with chacal and he says he's never seen o-rings here. Anyone have any experience with these. Did Yamaha change the part spec after these schematics where done? Should I be ordering the t-fitting and o-rings, now?
I appreciate any insight. Thanks!
#2: Re: 1982 550 carb t-fitting fuel input Author: vinnie, Location: Canada - Niagara PostPosted: Mon Sep 08, 2008 6:37 am
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I developed a leak at the same connection and when I investigated, the
o-rings were worn. I replaced them and it is now O.K.
#3: Re: 1982 550 carb t-fitting fuel input Author: fjpish, Location: New Jersey PostPosted: Mon Sep 08, 2008 7:23 am
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vinnie, Was your t-fitting rubber-coated or was it metal or hard plastic or something? Mine whole t-fitting is rubbery and really doesn't seem like it would use o-rings. The part itself has two rings on each half that make contact with the inside of the hole.
#4: Re: 1982 550 carb t-fitting fuel input Author: simona, Location: Toronto PostPosted: Mon Sep 08, 2008 9:06 am
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I think that there is an O-ring on either side of the pipe, a couple of carb sets I split have them on the T. Probably rot over time.
#5: Re: 1982 550 carb t-fitting fuel input Author: mainexj550, Location: maine PostPosted: Mon Sep 08, 2008 9:41 am
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I had to replace mine due to leaking.

The one that came out had no o rings, it was coated in a rubbery compound.

I'm pretty sure the replacement I received from the Yamaha dealer was identical to the old one.
#6: Re: 1982 550 carb t-fitting fuel input Author: Broke_Dirty_Maxim, Location: Jacksonville, NC PostPosted: Mon Sep 08, 2008 10:42 am
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I also recently replaced that tube due to leaking. The o-rings are required for the transfer tubes between the 1 and 2 and the 3 and 4 carb bodies. The T-fitting connects the 2 and 3 carbs, and does not have o-rings. The T-fitting is self sealing with the rubber coated lands. Personally, what I did, and would do if you are changing the middle tube, is to replace all the o-rings also. I figured, if the rubber tube was old enough to finally break down, so are the o-rings. Oh yeah, mine was on a 81 550 Maxim.
#7: Re: 1982 550 carb t-fitting fuel input Author: fjpish, Location: New Jersey PostPosted: Mon Sep 08, 2008 11:45 am
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OK, well I guess I'll order the t-fitting and o-rings for the other two connectors and see what I get. I really didn't plan on replacing the other o-rings, but since I've disturbed at least one set by taking off #1 & 2 from the rack, I might as well do them all. I'll probably get them from my local Yamaha dealer. Thank you all for your help.
#8: Re: 1982 550 carb t-fitting fuel input Author: schmuckaholic, Location: California PostPosted: Mon Sep 08, 2008 12:19 pm
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Chacal should be able to hook you up with the o-rings easily enough; I'm quoting the set of 8 because he doesn't list a set of 4. I also don't see a t-fitting in his price list.

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HCP3458 OEM Mikuni fuel line Tube O-Ring, each: $ 3.50

HCP3458SET8 OEM Mikuni fuel line Tube O-Ring, set of 8: $ 26.50

HCP6880 Aftermarket Mikuni fuel line Tube O-Ring, made from a durable Buna-N rubber material, fits just like the originals at a much better price. Each: $ 1.00

HCP6880SET8 Aftermarket Mikuni fuel line Tube O-Ring, set of 8: $ 7.50

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I'd be willing to wager he could get you the o-rings quicker than the dealer could order them in.
#9: Re: 1982 550 carb t-fitting fuel input Author: Broke_Dirty_Maxim, Location: Jacksonville, NC PostPosted: Mon Sep 08, 2008 12:37 pm
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I got my replacement tube and all the o-rings, eight are listed because each transfer tube holds two o-rings on each side, from cheapcycleparts.com. Order processing is a little slow, so your order will arrive in about ten days.

Not saying anything bad about Chacal. I plan on ordering from him in the near future, but ordering these particular parts will be cheaper through cheapcycleparts.
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