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TOPIC: Mixture screw rubber o rings

Mixture screw rubber o rings 2 months 1 week ago #23309

  • Z1300rider
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Hi, I have my 1979 Z13 carbs apart for some ultrasonic cleaning. The mixture screws were really loose in the holes due to worn out o rings. Does anybody know where I can get these? Cheers Marc.

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Mixture screw rubber o rings 2 months 1 week ago #23311

  • Kawboy
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Everyone knows or should know that I have been pushing information regarding Ethanol blended gasoline and the effect it has on elastomers (rubber based components) All the carb kits available for the KZ1300 have Buna N Nitrile o-rings and those o-rings hate ethanol. You need to buy Viton 75 material based orings to work with the ethanol. They are more expensive than the Buna N o-rings but if $10.00 for a complete set of o-rings to rebuild 3 carbs is going to break the bank then sell the beast.
www.theoringstore.com will sell you a set of o-rings including shipping for around the $10 mark. This is what you need

[/Oring for the Neeedle Seat Body 7.5mm X 1.5mm $1.39 each
Oring for Idle Air Needle 3.0mm X 1.5mm $0.75 each
Oring for carb bowl drain screw is a part #007 since there was no metric equivalent that fit correctly. cost $1.05
1980 KZ1300 B2 converting to an A2.
Now all that being said, you can get away with Buna-N o-rings for the air screws since they are not exposed to the fuel. I would think there is an oring store in your area and now you have the sizes required for the o-rings in the carbs. This info is also in the FAQ section of the site.
Hope this helps.
KB
1980 KZ1300 B2 converting to an A2.

The following user(s) said Thank You: biltonjim, Z1300rider, StanG, Frank833

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Last edit: by Kawboy.

Mixture screw rubber o rings 2 months 1 week ago #23314

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You sir, are a diamond. Thanks. I know the fuel eats these things but, this bike also hasn’t turned a wheel in eleven years and the whole thing turns forty this year. A lot of the rubber bits are giving me a headache.

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Last edit: by Z1300rider.

Mixture screw rubber o rings 2 months 1 week ago #23327

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Actually; the o-rings on the mixture screws (6) never come in contact with fuel. The idle-jets are under venturi vacuum which draws the fuel/air mix (only) past the needle tip. The o-rings prevent (additional unmetered) air from being drawn down past the threads which would create an idle issue.
1980 KZ 1300 sr# KZT30A-009997
Always High - Know Fear !

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Mixture screw rubber o rings 1 week 6 days ago #23821

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Kawboy wrote:

Oring for the Neeedle Seat Body 7.5mm X 1.5mm $1.39 each
Oring for Idle Air Needle 3.0mm X 1.5mm $0.75 each
Oring for carb bowl drain screw is a part #007 since there was no metric equivalent that fit correctly. cost $1.05



I just contacted the www.theoringstore.com customer service asking which exactly Viton 75 rings they suggest for ethanol containing fuels. They came back with V75 FKM (Viton, Fluorocarbon) 75 Duro O-Rings. (there are other types)

I'm just wondering about the prices you quoted Kawboy - they seem very high marked 'each'. Perhaps you meant per each bunch?

Anyway. The respective prices are $0.16, $0.14 and $0.04 per each o-ring. There is a minimum quantity to order - 4. I think it makes sense to order double the number needed for one carb and have spares, just in case. I'll be ordering more than that as I need to take care of more carbs than one.
1982 Kawasaki KZ1300 A4
Building an engine from random parts. This will eventually morph into building a bike from random parts - if it ever happens. Need a frame to begin with.

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Last edit: by StanG.

Mixture screw rubber o rings 1 week 6 days ago #23823

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Those prices I quoted were what I paid at an o-ring supplier in Newmarket Ontario. Later I found the oringstore.com . Better prices for sure.
1980 KZ1300 B2 converting to an A2.

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