Ca.model's smog removal - Page 2 - Kawasaki Z125 Forum
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post #11 of 27 (permalink) Old 05-21-2019, 12:10 PM
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Pic 6 (yellow line) / Re-route the vent hose down to bottom of frame (anywhere) and use the non Ca. model Fuel tank breather #14069-1004 if you want.

Anyone know exactly what the plastic piece that Kawee references above actually does? Does it keep from sucking shite up back into the tank?


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post #12 of 27 (permalink) Old 05-21-2019, 12:19 PM
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Dunno, neither of my bikes have one. This is the in-line chamber on the left side of the bike right?

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post #13 of 27 (permalink) Old 05-21-2019, 12:22 PM
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Couldn't I block off the nipple on the intake manifold, remove all the tubing, canister and whatnot, and place a 1-way breather directly on the gas tank nipple? Something like this?
https://www.ebay.com/itm/Gas-Fuel-Ta...K/262351825903


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post #14 of 27 (permalink) Old 05-21-2019, 12:25 PM
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Seems like it should work assuming it will only see vapor. Though we always had those on our dirt bikes and they never fouled up from the occasional liquid gas.

This is from my limited understanding though, @Kaw'ee would have the best idea since he took the whole thing apart.

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post #15 of 27 (permalink) Old 05-21-2019, 01:28 PM
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Looks like @mnnthbx sells these for the Grom. I don't see any reason why they wouldn't work on the Z as well. Maybe Greg can chime in since they have worked on both bikes and carry the Moose Racing tank breathers.
https://mnnthbx.com/product/fuel-tank-vent-honda-grom/


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post #16 of 27 (permalink) Old 05-21-2019, 01:28 PM Thread Starter
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I myself wouldn't use a 1-way breather. Not only do you need to let air in as the fuel level gos down. On hot days especially with a low fuel level the air/fuel expands inside the tank and needs to be vented out. Or if it does mist out i would want it not over the engine.

I did not use the OEM breather but figured most would want to use the non-ca model stock design when doing the smog delete.

The cap itself is vented so no need for anything as long theres a line thats long enough away from the tank just to make sure nothing backtracks into the cap vent I thinking.

Tank Pressure


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post #17 of 27 (permalink) Old 05-21-2019, 01:53 PM
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Looks like @mnnthbx sells these for the Grom. I don't see any reason why they wouldn't work on the Z as well. Maybe Greg can chime in since they have worked on both bikes and carry the Moose Racing tank breathers.
https://mnnthbx.com/product/fuel-tank-vent-honda-grom/
Works perfectly in that application.
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post #18 of 27 (permalink) Old 05-21-2019, 02:36 PM
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Works perfectly in that application.

On the Grom or the Z as well?

@Kaw'ee , what DID you do? Any pictures? My plan is to delete the canister since the Hoedar wont ever actuate the purge valve...



I thought the Z had a vent in the gas cap to let air in and that tube was basically just an overflow for the guys who put too much gas in when filling up at Costco...


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post #19 of 27 (permalink) Old 05-21-2019, 02:43 PM
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^Agreed^ I think the venting to prevent a vacuum condition in the tank should theoretically still be working as designed after this mod. They are separate vents.

For my own sanity, which way do these one way valves check? I'm used to seeing them on top of a gas cap, but that could be IN or OUT only, depending on what you are trying to accomplish. We are trying to use it in an OUT only application here.

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post #20 of 27 (permalink) Old 05-21-2019, 03:02 PM
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A bit of research says that those valves aren't actually one-way, but instead are two way for gasses and no ways for fuel (a ball bearing seals the valve when moved by liquid). Which makes perfect sense in an offroad application (and explains why they rattle). If installed upside down, it does seem possible that the valve would constantly be closed rendering the vent useless.

Because this vent is supposed to flow into a closed canister I'm guessing the location is designed to not allow liquid into it at all. Based on the schematic Kaw'ee posted it looks like the vent line in question is raised above the floor of the overflow chamber, while the overflow line sits on the bottom of that area to grab the spilled fuel.

So... I think the best option is just to delete the canister and add a simple mesh to the end of the line? No fancy valve needed. It's quite possible that I'm missing something still.

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