Rucka,
In regards to the post below.
"Any good feedback on this build package they offer. pros and cons of going 134 vs 144? looking to add a little pep in my 125s step. Any reliability issues?"
We have at least 6 YZ125s currently; stock, mod / ported, 134, 144. The 134 & 144 build details can be found here;
https://motocrossactionmag.com/mxas-yamaha-yz134-vs-yz144-big-bore-challenge/
or here
https://www.youtube.com/watch?v=SEkFsK8Hxn8
Our 2 cents on the 134 vs 144;
The 144 has been my go to since 2017 (I recently switched to a YZ250), 144 has good low, mid, and still pulls some up top, but signs off sooner then the 134, or even stock 125s. This set up was easier to tune then the 134. The 144 will pull a taller gear and let you make a mistake without feeling like you just dropped anchor.
134 is all mid to top. Has been harder to tune and we have since put a SmartCarb on it. If you arent really good at rolling corners, maintaining momentum, or your tracks are tight, the 134 is going to require more attention with the clutch then any of the other options.
Reliabilty; all OEM internals combined with the full Hinson kit is a must. Stay away from aftermarket bearings, cranks, whatever.
The best all around / reliable motor (for us) has been the stock or ported 125. I hope this helps. Let us know if you have questions moving forward.
MC
Billet526
- Lives in:
- Colorado Springs, CO USA
- Member since:
04/04/15
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Started new thread WTB; 05- and newer YZ 250 /125 OEM fuel tank
Looking for 05- and newer good / excellent condition YZ 2 stroke OEM fuel tank. Thank you MC
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This years 12 days are great! Thank you Vital for putting this list together w/ some awesome MX companies.
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Added reply in a thread Lectron fitment issue; air boot against the shock - YZ125
I can help, we have several yz125s w/different engine packages. Our mod motors do run a reed spacer, the stock motors do not. The Lectron does not fit w/ the reed spacer (at least for us). The Lectron does fit without the spacer but does rub the air ... more »
Added reply in a thread Truck, trailer, and bikes stolen. Colorado Springs / Colorado
Vital, Update 5/17/2019. A family friend identified the white expedition yesterday afternoon and followed it to some storage units, he called 911, Once CSDB arrived we recovered the 125. The suspect was questioned and released w/ no charges filled. The ... more »
Added reply in a thread Truck, trailer, and bikes stolen. Colorado Springs / Colorado
Vital, Update on the theft. The bike was seen here in town tonight!
Started new thread Truck, trailer, and bikes stolen. Colorado Springs / Colorado
Vital, Last night 5/13/2019 we had our truck, trailer, and bikes stolen from outside our home in Colorado Springs. CSPD was called immediately and vehicle info was uploaded to the national system. 2002 GMC Denali pickup, rear steer model, Colorado tag
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Started new thread Truck, trailer, and bikes stolen. Colorado Springs / Colorado
Vital, Last night 5/13/2019 we had our truck, trailer, and bikes stolen from outside our home in Colorado Springs. CSPD was called immediately and vehicle info was uploaded to the national system. 2002 GMC Denali pickup, rear steer model, Colorado tag
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I have a pair of SG12s, red and yellow, Answer special editions if you need em, size 10, 2 rides on em, $250
Added reply in a thread Forum QNA: 2019 250 Shootout
Michael, Thank you for all of the work you and the Vital crew have put into the 250 shootout. Have you guys found the YZ250F to be sag sensitive? Its calling for between 90-100, Ping mentioned that they felt 102-104 was the best to eliminate midstroke ... more »
Added reply in a thread How many hours before I need to replace main bearing on a 125?
I cant speak for any other brand except for Yamaha. We have several 125s, 134, 144... We have no problem getting 100+ hours on the factory crank / bearings. We have not found a aftermarket crank bearing that lasts longer then 20 hours. Im sure there ... more »
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Added reply in a thread Bummed that Tom Morgan got left out in the March MXA KX125 Feature???
I have an MXA magazine bike, a YZ 125, and MXA had no issues mentioning Toms work. Tom also built my other 125 and both motors are just killer. Hes one of the best, we need more people like him in the industry. Matter of fact, I was just thinking this ... more »
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Yoshimura is the tip of the spear. They have been an integral part of some of the best programs in 2 wheeled racing. Product quality and fitment for us has always been better then any of the other exhaust brands. We love running Yosh labels on our 2 stroke silencers, that always stirs the pot. Merry Christmas!
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