Carb Inlet Nipple Thingies

[catdna]

Hi All

It appears that my trike is sufferring with air-leak issues based around the brake-servo (powered by the inlets on the carbs). I'm going to try running it without the servo and just block those inlets, but I can't find (or know the right term ?) for the covers.

Anyone got a part-number / know of a replacement part for covering these up ? I could just use 4 bits of silicone tube with screws jammed in the end, but would like something a bit more aesthetically pleasing :-)

Cheers

Chris

[CatatonicBug]

The technical name is "Plug, Blind", and the part number is 16G-13569-00-00. Can also be known as 1J7-13569-00

Here's a picture of one.

Mikesxs.com sells them as part number 48-1447 for $1.50 each.

[catdna]

Excellent ! Thanks for that - I'm off to order some.

Cheers
Chris

[DiverRay]

You should also be able to get them at a local Auto parts shop. IIRC they are 5mm, and ANY "vacuum plug" of the correct diameter should work. They should ALSO HAVE the "one way" vacuum valves, a 2cm diameter bit that has a directional arrow on it. Put one on each tube between the nipple and the main line to the booster. That will probably fix the problems.

[mstic2000]

Hi All

I could just use 4 bits of silicone tube with screws jammed in the end, but would like something a bit more aesthetically pleasing :-)

Get the chrome ones.

[catdna]

Get the chrome ones.

Well, I just found out that mikesxs.net doesn't ship to the uk... damn !

So, I've been looking around but can't find any vacuum 'plugs' in the UK - I guess a further search of ebay is required..... or get some shinier screws for the vacuum hoses ;-)

(unless anyone has a black-belt in ebay searching for sellers who ship to the uk ?)

Cheers
Chris

[catdna]

You should also be able to get them at a local Auto parts shop. IIRC they are 5mm, and ANY "vacuum plug" of the correct diameter should work. They should ALSO HAVE the "one way" vacuum valves, a 2cm diameter bit that has a directional arrow on it. Put one on each tube between the nipple and the main line to the booster. That will probably fix the problems.

Any tips on where to find the vacuum valves ? searching ebay turns up nothing (at least, not with the terms I'm using)

Cheers
Chris

[DiverRay]

Chris,
Go to a breaker and look under the hood of a few cars. It will be a Gasoline engine, NOT Diesel.
Try this item: 310135792962 this is ebay, and what you are looking for. I DON'T know if the hose size is correct, but that should be an easy fix!

[MrOzz]

Try here www.xs650.biz or here www.xs650shop.de .

[catdna]

Thanks all !

As usual, my lack of knowledge, or knowing what things are called let me down :-) I've learned that the 'vacuum valve' is also a non-return valve / check-valve - plenty for me to search on now :-)

An ebaying I shall go

Cheers
Chris

[XSrunner]

Hi i have just replaced mine i work for an auto shop go to your nearest one and ask for 3/16" carby vaccum plugs or block offs, commonly used on holley carbs or older carbs to block off polution pipes

[catdna]

I think I might have found some useful check/non-return valves from a 'Koi Carp Shop' (they're quite small and sound like the right thing).

However.....

... I'm having a hard time trying to understand how they would work (which isn't difficult for me )

If the inlets on the carb holders are 'sucking' air from the tube, then putting a non-return valve in won't work will it ? Surely while the one carb inlet is sucking the valve 'open', the other 3 will also be 'sucking' at the same time, hence causing the same inbalance I'm getting at the moment ?

(as an aside, I'm considering just running the brake servo off one carb inlet - not the vacuum advance carb - or possibly ditching the servo altogether and getting uprated calipers for the rear end - anyone know of performance calipers for a MX5 / Miata rear end ? ;-))

Cheers
Chris

[CatatonicBug]

I think I might have found some useful check/non-return valves from a 'Koi Carp Shop' (they're quite small and sound like the right thing).

I use the same thing on the air lines for my fish tanks. I have the air pump in the basement, and the line is plumbed through the floor, and up into the living room. The valve prevents water from siphoning back down the hose if the power goes out and the air stops flowing. I got mine at PetSmart.

[fredintoon]

- - - I could just use 4 bits of silicone tube with screws jammed in the end, but would like something a bit more aesthetically pleasing :-) Chris

Hi Chris,
how about using a short length of fuel line with a ball bearing shoved up it?

[DiverRay]

If the inlets on the carb holders are 'sucking' air from the tube, then putting a non-return valve in won't work will it ? Surely while the one carb inlet is sucking the valve 'open', the other 3 will also be 'sucking' at the same time, hence causing the same inbalance I'm getting at the moment ?

What you are doing with the valves is letting the vacuum work on EACH carb ONLY. As the vacuum builds up in the booster, there will be sucking only when the intake has a lower vacuum than the booster. As of now, when the vacuum goes away in one carb, the other carbs will try to lower the pressure in it, and NOT JUST the booster. This will also allow the vacuum to stay within the booster so it will work even if the motor is shut down. If you look at ALL car brake systems with vacuum boosters, they have a one way valve in them.