
DESCRIPTION
Take your 2-stroke to the next level with the FMF Factory Fatty Expansion Chamber designed to give your YZ125 or YZ125X the broadest powerband and the cleanest pull from low-end grunt to high-RPM scream.
This isn’t your average pipe the Factory Fatty features FMF’s signature cone-look welds and raw finish for that factory race-team aesthetic. Beneath the surface, it’s all business: improved throttle response, smoother roll-on, and a noticeable boost across the entire rev range.
Supplied by Motozone NZ, because your YZ deserves nothing but the best.
~ Hand-Crafted Factory Welds, for that raw race-team style
~ Wider Powerband, with improved low, mid, and top-end performance
~ Thicker Gauge Steel, increases durability for off-road abuse
~ Improved Throttle Response, pulls stronger out of corners and ruts
~ Perfect Fit for Yamaha YZ125 & YZ125X, bolts straight up with OEM or FMF mufflers
~ Factory Race Look, no plating or polish – just performance
~ Made in the USA, race-developed, trail-tested
~ Motozone Trusted, proudly stocked in New Zealand by Motozone NZ
Whether you’re chasing lap times or threading trees, the FMF Factory Fatty gives your YZ125 the power and tone it was born for.
Yamaha
YZ125 2022-2025
YZ125X 2023-2025
SHIPPING
SHIPPING
Orders can be shipped from either Auckland, Hamilton, Kihikihi, New Plymouth, Wellington or Christchurch warehouses. Depending on the location of items you have ordered, Motozone will ship your purchase from the closest location where possible.
New Zealand
Free shipping on order over $199.00.
For orders under $199.00, shipping throughout New Zealand is $7.99 for Urban and $12.99 for Rural Shipping.
In most cases shipping is overnight however it can take 2-3 days depending on time/day the order was placed. If delivery is to a rural address please allow a couple of extra days. We can ship to your place of work!
Australia
Free shipping on order over $199.00.
For orders under $199.00, shipping throughout Australia is $7.99
Delivery takes approx. 5-10 days delivery.
RETURNS
RETURNS
Any goods purchased from Motozone can be returned within 30 days of receipt for refund or exchange.
The goods must be returned new, unused, unaltered, not previously installed, and in a sellable condition with all of the original packaging.
This right of return will not cover items that are special orders and found to be an incorrect fit, this is the responsibility of the purchaser, however all other standard warranties will apply.
Freight costs will not be refunded.
For the returns process contact or phone Motozone with your invoice number and the reason for return. We will then email you the correct form for processing.