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Discussion Starter #1
I got the kamikaze head to work with the z125. Heads are very similar but the intake flange is backwards so in order for this to work you must sand the flange down and tig weld material back on and sand it flat and drill and tap holes for the intake. Job wasnt incredibly difficult but you must have good tig welding skills to make this happen other than that everything else is a direct swap except for the engine temp sensor that has no place so you have to make a hole and tap it.

The specs on the head are
28.5mm intake valve with a 21.6mm titanium exhaust valve.

Finished up the job and test rode very happy for the work i put into it bike has lots more mid and top end. low end sucks but with big valves and a big cam thats expected. idle is a little tricky u have to lean it out to keep a nice idle. I have rollers and a roller style cam coming in with more lift and duration.
 

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That is a heck of a lot of work you did there and it turned out great. Glad to see you are still pushing ahead with developing the Z125 engine to see what it is capable of. And thanks for sharing it with us on the Forum. Good job!
 

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Discussion Starter #3
That is a heck of a lot of work you did there and it turned out great. Glad to see you are still pushing ahead with developing the Z125 engine to see what it is capable of. And thanks for sharing it with us on the Forum. Good job!
Thanks man. little by little. i want to throw it on the dyno soon
 

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I was gonna do this but just don't have the time right now. Have you checked to see if a Ninja 300 injector will fit. That was on my list to research if i did it. Kudos to taking the time and re engineering the figment 👊🏻
 

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Discussion Starter #6
I was gonna do this but just don't have the time right now. Have you checked to see if a Ninja 300 injector will fit. That was on my list to research if i did it. Kudos to taking the time and re engineering the figment 👊🏻
i think it will bolt up but idk if the bazazz or pcv will be able to turn the fuel down enough for it to no be stupid rich. lobot has done some testing with fuel injectors right now i havent maxxed out the stock system with a 30% increse in fuel holding a 12.5afr. i am still working on my duel injector setup so i can have one injector in the intake and come on at higher rpms. i have everything but im going on vacation so when i get back ill start setting it up.
 

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Good to know. Thanks for the info and research to. I was assuming the stock injector would reach it's limit. Looking forward to seeing that dual injector set up. Did you bore out the throttle body a few MM's and cut another butterfly.
 

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Discussion Starter #8 (Edited)
Good to know. Thanks for the info and research to. I was assuming the stock injector would reach it's limit. Looking forward to seeing that dual injector set up. Did you bore out the throttle body a few MM's and cut another butterfly.
thanks man. Im on the stock throttlebody they sell a 2mm bigger one but im not interested in spending the money for 2mm so im going to wait till a better alternative comes out. with the big cam it rips but i wanna get it on the dyno to see how far the stock tb can go. at this point im almost maxxed out on the 143cc platform. the secondary injector setup will pretty much make better power due to better fuel atomization
 

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Discussion Starter #16
Right on👍🏻 Honda trail bikes is mailing me a bunch of parts to play with, so i will be doing something similar soon.
definitely do a build thread man. ive been playing with fuel trims getting this thing dialed in more. lots more power
 

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Discussion Starter #18
i have loads of miles on mine id say its worth it if you can get a flange adapter unless u want to weld it. but either way its a steal and a great head. castings is solid.

Is it still worth it seams the race head with a cam runs 230$ and just the v2 is 420$
 
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