Project : Beast Mode **MXoN update**

Edited Date/Time 10/7/2025 5:17pm

Well judging by the title you’ve probably guessed it. An ET3 replica! The other year I made a decent effort at making a Star Yamaha MXoN replica after being at the race in 2022 working with Alpinestars medic unit. I was in love with the way Star had the bikes looking and wanted mine to look like that. So I updated the body work on my 2011 YZ and added some carbon fiber bits. I think it turned about pretty good. But this one is going to be even better! I’ve got some pretty cool things in the works for it. IMG 4531 1IMG 4527 1IMG 6698 2

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6/8/2025 5:13pm Edited Date/Time 6/8/2025 5:14pm

I thought it was pretty cool I made it in the same photo with Eli. That weekend is one of my all time highlights. Anyways, I’ve got a ton of parts saved up and ready to go 

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 started buying parts on sale for Black Friday. Gotta get the deals when you can! 
My soon to be 3 year old loves to “help” me with my bike anytime she can! 
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6/8/2025 5:17pm

I did some mock up and found a cheap YZF brake pedal on eBay for cheap. Spray paint special. With some help from a fellow VitaMX member I was able to make a spacer to get the alignment for it to work. I then filed down the casting line and scrubbed it down with a scotch brite pad & some WD40. Then just for fun I hit it with some White Diamond metal polish real quick just to see how it would look. I like it but I’ll make it better. IMG 0824 2.jpeg?VersionId=nxGE8dQtRa2OjrHrnjh2QB6WiKhjCzIMG 0831 5IMG 0954 2.jpeg?VersionId=osSJXIMG 0955 2IMG 0958 2

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6/8/2025 5:21pm

Next on the list is the 2009 YZ450F swingarm conversion. The four stroke swingarms look so much better, are 5mm longer and almost a pound lighter too! I found one on eBay (yet again) pretty beat up for $100. I figured I’ll snag it and see what I can do before I invest a lot of money into it. And if I don’t like it, at least I’m not out much. Spent a lot of time working on this. Easy Off oven cleaner to strip the clear anodizing finish off, Pryme MX pads on the bench top buffer and some Napa Aluminum Brightener along with the trusty ole scotch brite pads. The sides still have some deep gouges I won’t be able to get out unless I get it filled with weld and then sand down. I’m not too concerned about it since a decal will cover that up. IMG 0629 2IMG 0909 2

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6/8/2025 5:24pm

Picked up a set of FasterUSA blue on blue wheel set! Holy cow do they look amazing in person! Also added a black Vortex sprocket, Braking batfly rotors like Eli’s bike has. And of course a fresh set of  Dunlop MX34s. 
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The Shop

JWACK
Posts
2582
Joined
8/7/2009
Location
USA
6/9/2025 10:38am

Nice work! 

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6/9/2025 11:15am Edited Date/Time 6/9/2025 11:28am

I had the oem head cut for a 50/50 mix of pump gas & C12. Then the head was powder coated. I ran it for awhile and got a Apex head with the MX dome for pump gas. The Apex head was great and did what it was advertised to do. My only complaint was the blue was a few shades off of the typical anodized blue color. That’s my only complaint. The guys at Apex build a great product and have great customer support via Facebook groups. IMG 5978 4IMG 8301 2

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6/9/2025 11:34am

I had seen where Yamaha made a GYTR cylinder kit for the 125, but it was only available over seas which is kind of odd. Not that it would work on mine anyways I did find the cylinder head pretty sweet. Which is what lead to my next purchase. In my opinion the best looking head was made by VHM. Turns out they offer a blue! The color is pretty spot on too! Snagged it on BF from Langston Motorsports! One of my friends at work happens to have a laser engraver and added the GYTR logo onto the side for me. Also have their version of the pump gas MX dome. IMG 1045 1IMG 1046 2IMG 0422 0

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6/11/2025 6:42pm

Didn’t get much time tonight to work on the bike but I made decent progress. Even had my little butterfly helper tonight LOL. 

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Zesiger 112
Posts
2362
Joined
3/4/2013
Location
Galveston, TX, USA
6/15/2025 3:57pm Edited Date/Time 6/15/2025 3:58pm

This is going to be sick! Your bike was already a looker. Are you going to change tank/airbox/seat to new? 

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6/15/2025 5:53pm

This is going to be sick! Your bike was already a looker. Are you going to change tank/airbox/seat to new? 

Thanks man! 🤘🏻. I had seriously considered converting over to the 22+ body style but to do it right using oem parts it was going to be around the ballpark of $1,200. I rode my buddies ‘23 at the track one evening and wasn’t a fan of the seating position. Which I thought was a little weird to me since I loved the position on my 2018 YZ250F I had. I guess since having this bike since 2013 I’m most comfortable with the ole reliable setup 

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6/15/2025 5:58pm

Made some good progress over the weekend! Got the frame stripped down and cleaned up pretty good! Also got my Bolt Hardware kit out. I opted for the nickel plated restoration kit. They look so good! Replaced the clutch and started adding a few new bolts. And grilled a couple of ribeyes and had myself a nice Jack & Coke for Father’s Day! 
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6/22/2025 5:06pm
CrGuy2T wrote:
1800.00 plus shipping.. robertmartin517@yahoo.com also have a 2 piece shock..

1800.00 plus shipping.. robertmartin517@yahoo.com also have a 2 piece shock..

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Man those are nice! That would be perfect for mine. Wish I had the extra cash because I’d snag them! Once school starts back up I’ll have two kids in daycare so I can’t wait to basically have a second mortgage 🤣

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6/22/2025 5:11pm

Back at it again the last few days. Got all the swingarm, linkage and steering bearings replaced on the bike. I took the triple clamps to work and pressed the stem out, stuck the clamps in the freezer that’s -34° and put the bearing in the 250° oven and dropped right on! Get the engine put in today and finally have the bike as a rolling chassis. Used the stock wheel set to move around for now and some of it is just finger tight for now so I could move it around. The heat here in OH has been HOT! Low 90s with close to 60% humidity! I powered through it today lol 

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WetClutch12
Posts
47
Joined
7/27/2022
Location
Atascadero, CA, USA
6/22/2025 10:43pm

Looking sick dude. Love the photos and progress. I don’t think there is a more fun bike to build / ride than a 125 or yz125 for the matter. Rebuilt an 03 and loved it so much had to grab a 25’ to add to the stable. Not much building on the new one though. Just a shorty and took the header pipe to the bench grinder to get rid of all that black paint that it comes with… thing loooks like a works pipe now with some torch seams and scrotch brite love lol.  Can’t wait to see the finished product! 

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6/23/2025 6:25am
Looking sick dude. Love the photos and progress. I don’t think there is a more fun bike to build / ride than a 125 or yz125...

Looking sick dude. Love the photos and progress. I don’t think there is a more fun bike to build / ride than a 125 or yz125 for the matter. Rebuilt an 03 and loved it so much had to grab a 25’ to add to the stable. Not much building on the new one though. Just a shorty and took the header pipe to the bench grinder to get rid of all that black paint that it comes with… thing loooks like a works pipe now with some torch seams and scrotch brite love lol.  Can’t wait to see the finished product! 

Thanks man! Yeah I agree a 125 is a blast to ride. I hop on one about twice a year and rip a few laps and really enjoy them. I’d love to have a YZ125 or even another 250 for a woods bike. But a new 450 sounds nice too

cdoggy81
Posts
1491
Joined
1/1/2018
Location
St. Petersburg, FL, USA
6/23/2025 9:36am

Nice build 👍🏻

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6/24/2025 9:32am
cdoggy81 wrote:

Nice build 👍🏻

Thank you! I’m excited to get this thing finished! I’m getting pretty close now. Can’t wait to ride it with my rebuilt suspension and the YZF 450 swingarm on it 

6/24/2025 9:35am

Forgot to post this earlier. Got my suspension redone by Brad at Rideworx Suspension in the Cincinnati, Ohio area. New valving, bushings, seals, free pistons and oil. My oem free pistons were junk! The other one not pictured was cracked in half! Shame on me for not having them serviced sooner. This should feel like a whole new bike now!  

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cdoggy81
Posts
1491
Joined
1/1/2018
Location
St. Petersburg, FL, USA
6/24/2025 10:56am Edited Date/Time 6/24/2025 2:02pm
cdoggy81 wrote:

Nice build 👍🏻

Thank you! I’m excited to get this thing finished! I’m getting pretty close now. Can’t wait to ride it with my rebuilt suspension and the YZF...

Thank you! I’m excited to get this thing finished! I’m getting pretty close now. Can’t wait to ride it with my rebuilt suspension and the YZF 450 swingarm on it 

you will like it. I have it on both of my smokers 👍
What is the length of the RE linkage, 144 or 143.5?

6/24/2025 6:02pm

Those zeta pistons are money. 

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6/25/2025 4:47am
cdoggy81 wrote:

Nice build 👍🏻

Thank you! I’m excited to get this thing finished! I’m getting pretty close now. Can’t wait to ride it with my rebuilt suspension and the YZF...

Thank you! I’m excited to get this thing finished! I’m getting pretty close now. Can’t wait to ride it with my rebuilt suspension and the YZF 450 swingarm on it 

cdoggy81 wrote:

you will like it. I have it on both of my smokers 👍
What is the length of the RE linkage, 144 or 143.5?

I’m almost positive it’s the 143.5mm length. I knew from reading on the swingarm swap that was the length needed

6/25/2025 4:48am
Rickyisms wrote:

Those zeta pistons are money. 

Agreed. I’ve heard plenty of good reviews from them

cdoggy81
Posts
1491
Joined
1/1/2018
Location
St. Petersburg, FL, USA
6/25/2025 7:14am

I’m almost positive it’s the 143.5mm length. I knew from reading on the swingarm swap that was the length needed

Either length is fine & much needed for the conversion. Just make sure you know which is which. I have both & run both but I tend to run 2-3mm less sag with the 144 as it lowers it a tiny bit more. For reference stock is 142mm. I think I have a143 on the 250 & a 144 on the 125. 

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Tiki
Posts
10621
Joined
8/1/2006
Location
Corona, CA, USA
Fantasy
6/25/2025 7:59am

I am totally invested! This looks amazing. I love your top tech. She's adorable. Put her to work, she'd be good for 10 inch lbs. Proper torque for the clamps. 

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6/27/2025 1:06pm

I’m almost positive it’s the 143.5mm length. I knew from reading on the swingarm swap that was the length needed

cdoggy81 wrote:
Either length is fine & much needed for the conversion. Just make sure you know which is which. I have both & run both but I...

Either length is fine & much needed for the conversion. Just make sure you know which is which. I have both & run both but I tend to run 2-3mm less sag with the 144 as it lowers it a tiny bit more. For reference stock is 142mm. I think I have a143 on the 250 & a 144 on the 125. 

Sounds good man I’ll keep note of that. I still have the reciept in my tool box so I’ll have to reference that just to confirm.  

6/27/2025 1:09pm
Tiki wrote:
I am totally invested! This looks amazing. I love your top tech. She's adorable. Put her to work, she'd be good for 10 inch lbs. Proper...

I am totally invested! This looks amazing. I love your top tech. She's adorable. Put her to work, she'd be good for 10 inch lbs. Proper torque for the clamps. 

Thanks man! Lots of hard work went into getting all the parts, plus the build! Yeah she’s something that’s for sure! My dad asked me how my mechanic was and I said “she had a hard time staying on task and sure asked a lot of questions” lol. But she’s a cutie. I think I’ll keep her! Plus pay is cheap, she’s easily motivated by juice boxes & popsicles 😂

6/27/2025 1:17pm

One of the perks of my job is the 4/10 schedule & having Fridays off! I can really get a lot done on these days! Shoutout to my buddy “Corndog Colt” for coming over this morning and giving a hand wrenching! I’d say we’re about 80% done now! Got the front end finished and just put the tank on for looks now. Should have the new OEM carb hoses tomorrow so I can get that swapped & installed. This morning we did : forks, new FasterUSA wheel set, G2 ergonomics throttle tube, ARC front brake, P3 carbon master cylinder guard, ARC RC-8 clutch perch assembly, ProTaper SX Race bend bars (same as Eli) & got the radiators on and ready to go! 
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6/27/2025 1:20pm Edited Date/Time 6/27/2025 2:43pm

And I’ve also got some pretty exciting news! For anybody at Redbud MX next weekend make sure you stop in at the Legends & Heroes tour to take a look at this beauty!! I’ll be there displaying it! I’m hoping to be there Friday so I can possibly get it into the pits and over to the Star Yamaha trailer and get some pictures with Eli’s bike too! I’m so freaking excited I can’t wait!  IMG 1199 5

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