I'm not an RC expert, just a regular guy who loves RC and bashing around. In the coming paragraphs, I will list out 10 of most important upgrades for the Axial Yeti, based on my personal experience.
BASIC UPGRADES
Axial Yeti Aluminium Wheel Hub (from GPM, Boom Racing)
If you are running Axial Yeti RTR with 3s lipo battery, you will immediately encounter the first problem of this rig, which the plastic wheel hub (especially the rear one) will strip due to its immense power. Although Axial released a better plastic part as replacement. The aluminium wheel hub will certain solve this problem for goods.
Axial Yeti Aluminium Front/Rear 2.2 Wheels Beadlock 6 Poles Swirl (from GPM)
The second, also the most painful problem for the Yeti is their 6 bolt plastic wheels. Bolts hold up to the wheel hub will tear the plastic wheel and the plastic wheel will run off during the run. I found myself and guys in Youtube have the same problem.
There aren't aftermarket 6 bolt wheel on the market, especially if you are looking for light-weight aluminium beadlock wheels for speed run. Vanquish has the best after market aluminium 6 bolt wheels on the market but it is expensive. On the other hand, GPM has the best solution to the problem by designing the aluminium wheels beadlock 6 poles swirl. Those are direct replacement for Axial Yeti original plastic part. And you need to combine original beadlock rings and inner-beadlock to assemble it, as the GPM parts only have the outer-wheels.
Alumiuium Front Arm Bulk
This part is small but important. After many runs and crashes, I found the original plastic front arm bulk is pretty weak. One day, I hit a tree with my Yeti. Although it was not a big hit, but the whole right arm was completely ripped off from the body. The arm screw was broken into two and half of it was left inside the screw hole of the body. One arm pole was broken. The A-arm was fine as I upgraded it to aluminium. I highly recommended Yeti owners to upgrade it as soon as possible to prevent disastrous outcome after crashes.
Wide Rear Axle Kit for Axial Yeti (from SSD)
Considering one of the most innovative upgrades for the Axial Yeti, the wide rear axle kit from SSD makes its rear wheel-width similar to the front, allowing Yeti owners to use wheel hex instead of 6 bolt wheel hub. With the wide rear axle kit equipped, you can put whatever wheels you want to your Yeti.
Aluminum Rear Lower Links
One of the most predictable parts that is going to replace after a few runs. The original plastic links simply cannot the take the force and the impact of the vehicles. Many after-market companies have released its aluminum rear lower links. Its all matter of your tastes.
Aluminium Spur Gear (from Axial)
Another obvious part which will need upgrade sooner than other parts. The original plastic gear will not sustain the force of 3s lipo. There are few after market options for spur gears upgrades, but Axial provide many options, ranging from 56T, 60T, 64T and 68T for different driving settings and preferences.
PERFORMANCE UPGRADES (optional)
Yeti Double Sheer Steering Rack Kit (from Vanquish Products)
Vanquish is the first after market company that released the steering rack upgrade for the Yeti. Comparing to the original plastic rack and bearing, the upgraded one improves the steering performance of the vehicle significantly.
Delrin Hex Wideners +5mm/+10mm thickness (from GPM)
The Axial Yeti has a similar size with a 1/8 scale truggy. If you want your Axial Yeti to go fast and stable, one of the key upgrades is to increase the wheel-width to make it more stable. The wide rear axle kit from SSD will equalize the wheel-width of the front and rear. If you are still using 6-bolt beadlock wheel on your Yeti as I do, the delrin hex wideners from GPM could easily increase the wheel-width of your Yeti by 10mm to 20mm. With the delrin hex widners, wide rear axle kit and 22mm aluminium wheel hub combined. The wheel-width of my Axial Yeti is 66mm wider than the original one.
Two Speed Transmission (from SSD)
The two speed transmission upgrade not only providing low speed option for crawling, but also provides alternative pushing Yeti to the extreme. The low transmission gear ratio allows the Yeti has a much more aggressive spur/pinion gears setting. With the right setting, it allows the Yeti to goes fast at the low transmission and EXTREMELY FAST at the high gear.
40 - 60wt rear shock oil setting
The original shock oil setup for the Yeti RTR and KIT versions are 10wt. Thin shock oil makes its rear shock too responsive. When I was driving off-road with high speed, the back of the Yeti was bumpy and almost like it was flipping forward. To make the Yeti run more stable, using the thick shock oil would definitely make the rear shocks less responsive and stick to the ground.
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