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Discussion Starter #1
Going to use this area to do some wide band tuning on the z125

Im just waiting on a couple parts to arrive so I can mount a sensor to the small exhaust header on a all stock bike

What I plan to do is get a baseline reading on stock bike

Then slowly do mods

I plan on doing a free mod to the air box first opening up the intake hole to get more flow in
see if any gains are made (most likely top speed will only be checked, maybe a hill climb too)
and see what wideband readings I will get when doing so




Then if no gains are felt, or recorded I will try an aftermarket intake setup and see what changes those do

Because sooner or later most everyone will buy one anyways so I'm curious to see how much more those flow by reading the levels with the gauge


Then later a exhaust, since that will be a big expense I may try to borrow one or use a bike that has one installed to get the reading. I do like the looks of the stock exhaust and wasn't really planning on buying one right away, not until I can see more what people post if adding one can justify the cost in performance gains


Ive used this same wideband setup on many bikes and scooters, carb, fuel injected and I can say its very easy to see changes on a gauge
rather then trying to read plug colors or butt dyne. I have a full speed road I use 1 min away from home and a hill climb , also freeway if needed so makes it quick to do tests.

And I've seen little changes show up on a meter too and thats all with a sniffer in the past. Im sure welded on the header could be more accurate.

A lot of people say fuel injection will self adjust, yes but to a point
the injector will only flow so much, and they aren't going to put in huge injectors and run them at 1/4 flow they will be the correct size for whats needed on a stock setup and be able to function through different driving conditions

I've seen many times you just cant make too big of a change and have it running in the safe zone it will still run good enough, but lean
and only lean I'm concerned about is full throttle for a long time can ruin an engine. So thats what I always check first and try to get that perfect since these are such small engines we usually end up having to run near full speed just to keep from getting hit on roads around here





So anyways this is what I rigged up
I had a genius idea of mounting a ram ball to it, as everyone around here runs a ram mount on the bars somewhere
so makes it super easy to attach the gauge for testing
Before we would zip tie it somewhere really hard to read it and trying to get full throttle runs so this makes it a lot safer now





On the end for the power connection again all of us here have battery tender wires on the batteries so I put that type of fitting so its plug and play






This is what I'm using, this is all you need its a complete kit
only 2 wires to connect to make it work if anyone else wants to invest in one and post up their readings so we can compare. Im at sea level here


The kit even comes with one bung so you could use that to make a tail pipe sniffer if you had too
Aem Wideband O2 Uego Controller Air Fuel Ratio Gauge Kit Bosch 4 9 LSU | eBay


In the past I had used a tail pipe sniffer but it was long and had to be secured with straps to keep from vibrating out. Plus it looked crazy if cars were behind you probably thought you were brewing beer or something



This won't work on exhausts with spark arrestors and if you have a fancy exhaust you risk scratching up the tip

Also doesn't work well with stock exhausts that have small outlet tip and for the z125 would be a nightmare to rig up


So I decided I'm going to weld on a bung on each bike I do from now on. This way its the best reading you can get, and super easy to go back later to check tuning if mods have been done. Only negative is if you have a expensive exhaust then it will have an ugly bung capped off. Of course if it can be hidden that will be tried first but if not you will see it all the time


Here was one I did today, I'm sure you can tell which was my o2 sensor I added :p
And unfortunately no where to hide it



But it worked great and using a fuel controller got it pretty much dialed in
Nothing like pulling over, pushing a few buttons and watching it change on the gauge








more to come once my 12mm bung and 18mm adapter show up
 

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Going to use this area to do some wide band tuning on the z125

Im just waiting on a couple parts to arrive so I can mount a sensor to the small exhaust header on a all stock bike

What I plan to do is get a baseline reading on stock bike

Then slowly do mods

I plan on doing a free mod to the air box first opening up the intake hole to get more flow in
see if any gains are made (most likely top speed will only be checked, maybe a hill climb too)
and see what wideband readings I will get when doing so
Then if no gains are felt, or recorded I will try an aftermarket intake setup and see what changes those do
Because sooner or later most everyone will buy one anyways so I'm curious to see how much more those flow by reading the levels with the gauge


I look forward to seeing what exactly you do to the air box to increase flow and what gains ( if any ) are made. Good stuff.... Thx
 

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Discussion Starter #3
I would open the air inlet on the air box first
to allow more air to suck in doing small changes at a time

but how am I doing that, not sure yet if there is an area I can make holes that I can easily plug the hole if it ends up to large
and then go back to a smaller size

haven't pulled out the box to even see how its built or where it sucks in air from

but I'm sure it won't be hard to figure out
I want to see if any performance gains can be done with the stock filter and box that anyone can do at home as a "free mod" and just not run the bike too lean




Next I will install mnnthbx intake using stock exhaust, see what readings I get and see if any gains come


then install the yoshimura exhasut, no fuel controller and see how it reads and if any gains

then install the bazaaz fuel controller along with the above





I have already purchased the mnnthbx air intake setup since , yoshi exhaust, and fuel controller
so at the end I will be upgrading everything just like to get a base line on the bike fully stock
before doing any mods
 

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Discussion Starter #4
well got a little bad news

the adapter parts I ordered won't work together





look at the threads




may have to find a nut the same thread pitch as the o2 adapter and weld that on the pipe
then use a bolt to plug the hole once testing is done

will sort of look tacky, but after the testing I won't be using the stock exhaust anyways
unless I want to sell it one day

not sure what I will do
 

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Discussion Starter #5
well going to have to put this all on hold

I did find a nut to fit the threads of the o2 adapter
but I would need to use 2 nuts tall
which isn't a big deal but they would both need to be welded together
and not mess up the threads inside

and won't look too nice either

I did remove the air box today, exhaust to do some mods
also took out the spark plug to check the color

I have 600 miles on it







unfortunately all the parts I removed, won't be going back on either
was hoping the parts I had ordered to do the testing could of happened last weekend but didn't so I got caught up on modifying the bike instead
 

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Mike, be aware there's an ideal depth to mount the sensor, and any form of adapter won't achieve that. To some degree, you'll reduce the accuracy...

Hit me up tomorrow evening, and I should have an initial map for Yosh/Mtake. Test it and see what you think.
 
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