Omni-Terminator Motor & ESC Upgrade: KV, Pinion Sizes and 2S/3S/4S Explained

By RcFanz Team · Updated: Nov 9, 2026

Most Omni-Terminator power questions come down to three numbers: motor KV, the number of battery cells, and pinion tooth count. Get those three to agree and the truck is fast and reliable. Get them wrong and you cook a motor or an ESC. This guide puts the maker's specs, the ESC makers' limits and a calculated gearing chart in one place, and labels what is a maker rating and what is only an owner report.

Your stock power system (Metal vs Carbon)

First, check which version you have: the motor can label (28 mm or 36 mm) and the ESC amp rating tell you straight away.

Neither stock ESC is rated for 4S. Owners report that the Carbon's 2650KV motor survives 4S with lower gearing and regular temperature checks. That is a community claim, not a maker rating. Do not run the Metal's 2852 3100KV motor on 4S.

KV, voltage and cells in plain English

A brushless motor's no-load speed is roughly KV × battery voltage. A 3100KV motor on 2S (7.4 V nominal) turns about 22,900 rpm; on 3S (11.1 V) about 34,400 rpm. More cells means more rpm for the same motor, which is why higher-cell setups use lower-KV motors.

• 2S (7.4 V): gentle and cool. Good for beginners and kids.
• 3S (11.1 V): the stock "fun" setup for both versions.
• 4S (14.8 V): experts only, and only with a 4S-rated ESC, lower gearing and a temperature check after every pack.

Pinions and gearing: 19T vs 22T and the 48P chart

Both versions use a 65-tooth, 48-pitch spur gear. The pinion on the motor shaft sets the final drive: a bigger pinion means a taller gear, more top speed, more heat and harder launches. The chart below is calculated from the 65T spur, the 3.09:1 internal ratio and the 104 mm tire.

19T vs 22T: 22T is about 16% taller than 19T. Go up one tooth at a time, run a short pack, and check motor temperature before going further. A rule of thumb many hobbyists use: if you cannot hold your finger on the motor can for about five seconds (roughly 70 °C / 160 °F), the gearing is too tall.

Setting the gear mesh

Slip a thin strip of paper between the pinion and the spur, push the gears together, tighten the motor mount, then pull the paper out. The gears should turn freely with a tiny amount of play. Too tight wears the teeth and heats the motor; too loose strips them.

Speed pinion on 3S?

A big "speed" pinion on 3S raises current draw and motor heat quickly. If you want speed, add it one tooth at a time and keep the temperature check as a rule, not an afterthought.

5 mm shaft motors: the 48P vs 32P trap

Stock shafts are 3.175 mm; most 3660/3668-size motors have a 5 mm shaft, so a new motor usually means a new pinion. Owners report that the clean route is a 32P 5 mm pinion with a 32P 42T steel spur and a 40-series adjustable mount, because the stock carbon mount can foul the larger pinion's grub screw. The alternative is a 48P pinion with a 5 mm bore from a third-party maker. This is owner-reported: confirm your parts match before you order.

Upgrading on 3S: motor and ESC choices

Metal owners: a 36-series mount with a 3650/3660 motor of about 3000KV or less, paired with a 60–80A ESC, is the common step up. Respect the ESC maker's KV limits: some 60A and 80A budget ESC manuals cap 3660-size off-road and monster-truck motors on 3S at about 3000KV (60A) and 2600KV (80A). Carbon owners: the stock 2650KV motor is already strong, so upgrade the ESC for reliability or add a programming card.

Is a 3700KV motor too much? On 2S it is fine. On 3S a 3700KV 3660-size motor is beyond the KV limits many 60–80A ESC manuals give, so gear it low and watch temperatures. Do not use it on 4S. The Hobbywing 10BL120 G2 combo's 3660SL G2 3700KV motor is itself a 2–3S motor.

Same-KV "upgrades": a 2852 3100KV combo has the same can size and KV as the Metal's stock motor, so it is a replacement, not an upgrade.

Going 4S: what you need

• A 4S-rated sensorless ESC (100–120A is typical). The Hobbywing QuicRun WP 10BL120 G2 sensorless is rated 2–4S. The sensored 10BL120 G2 is a different product, and owners report buying the wrong one. Read the listing carefully.
• A motor of about 2000–2650KV in a 36 mm can and a smaller pinion to bring the gearing down.
• A BEC that can feed a strong servo and plugs that handle the current.
• Durability work first: more power loads CVDs, diffs and the servo. See the durability upgrade guide.

Some budget 60A/80A ESCs are 2–3S only, so a listing that does not explicitly say 4S should not be treated as a 4S ESC.

Batteries: 2S, 3S or 4S and what fits

The stock pack is a 3S 2200mAh LiPo, about 23 × 35 × 108 mm, with an XT60 plug. Retailer data lists a small battery bay of about 110 × 36 × 30 mm and a larger bay of about 140 × 30 × 45 mm when the tray kit is used. Measure your own bay before you buy. Owners report that a 4S 2200 pack fits the stock bay, and that bigger packs need the ESC moved. For plug types, bay sizes and what fits every model, see the battery guide.

ESC relocation and mounting

The stock ESC mount (zip ties and tape) tends to work loose after repeated hard runs. Moving the ESC to the centre brace frees up the battery bay for longer packs, but it sits higher and is more exposed to hits. Keep zip ties clear of the centre shaft, and keep the ESC away from the motor's heat. 3D-printed ESC mounts exist if you prefer a solid fix.

Install checklist

1. Battery out. Always.
2. Swap the motor. Check the bullet connector size (3.5 mm vs 4 mm) and use correct adapters or re-solder.
3. Fit the pinion for the new shaft size and set the gear mesh.
4. Mount the ESC and route wires clear of moving parts.
5. Calibrate the throttle range for the new ESC.
6. Set the ESC's LiPo cell count and low-voltage cutoff.
7. Set drag brake and punch to a gentle starting point.
8. First run on 3S, short pack, then check motor and ESC temperature.
9. Only then think about a taller pinion or 4S.

What breaks after a power upgrade

More power loads the drivetrain. CVDs popping out, diff cups splitting and hub wobble are the usual casualties. Fix those, or set the truck up to avoid them, using the durability upgrade guide. Bigger tires also change your gearing, so read the tires and body guide before you mix both changes.

Storm Breaker (SBK10) owners

The Storm Breaker uses the same motor/ESC pairs and the same 48P spur family, and the maker lists 48P pinions for both RZ001 and SBK10. Check each part's fit before ordering.

Upgrade parts on AliExpress

Generic upgrade parts that match the guide above: a sensorless motor, a waterproof ESC and a 3S pack. Check cell count, KV limits, shaft size and connector on each listing against the specs in this guide before you order.

YSIDO 3650 / 3660 / 3674 sensorless brushless motor

From $30.79 · Seller: YSIDO Store

Price correct as of Nov 9, 2026 and may change

Sensorless brushless can motor in 3650, 3660 and 3674 sizes, with 5.0 mm or 3.175 mm shaft options. Pick the size, KV and shaft on the listing, and match them to your ESC's KV and cell limits.

View on AliExpress

Surpass Hobby Rocket RC V2 Supersonic waterproof brushless ESC

From $28.73 · Seller: SURPASS HOBBY Official Store

Price correct as of Nov 9, 2026 and may change

Waterproof brushless ESC sold in 50A to 150A versions. Check the cell count (2–3S or 4S) and the motor KV limit on the listing before you order. A 3S-only ESC cannot take a 4S pack.

View on AliExpress

Zeee 3S 2200mAh shorty LiPo, 11.1V 50C (2-pack)

From $25.99 · Seller: ZEEE Direct Store

Price correct as of Nov 9, 2026 and may change

Two 3S 2200mAh packs. Choose the XT60 plug option on the listing, and check the pack size against your battery tray and your model's maximum cell count before ordering. See the shipping and charging safety sections of our battery guide.

View on AliExpress

The buttons above are AliExpress affiliate links; a purchase may earn RcFanz a commission. Product details come from the seller's listing, so confirm the specs there.

FAQ

Can the Omni-Terminator run 4S out of the box?

No. The stock ESCs are rated 2–3S. You need a 4S-rated ESC, and the motor and gearing should be lowered for 4S voltage.

Is the Carbon's 2650KV motor 4S-capable?

Owners report running it on 4S with a 4S-rated ESC, smaller pinions and temperature checks. That is an owner report, not a maker rating, so treat it as at-your-own-risk.

What pinion comes on the Omni-Terminator, and what pitch is it?

The gears are 48P (0.53 module) with a 65T spur. The manual prints a 16–19T pinion range for the Metal and 24–27T for the Carbon; the exact fitted tooth count is not stated, so count the teeth on yours.

19T vs 22T: which pinion should I run?

22T is about 16% taller than 19T: more top speed, but more heat and harder launches. Change one tooth at a time and check motor temperature after about five minutes.

Is a 3700KV motor too much for the Omni-Terminator?

On 2S it is fine. On 3S it exceeds the KV limits many 60–80A ESC manuals give for monster trucks, so gear it low and watch temperatures. Do not use it on 4S.

Which Hobbywing 10BL120 works on 4S?

The QuicRun WP 10BL120 G2 sensorless is rated 2–4S. The sensored version is a different product, and its combo motor in the 3660SL G2 3700KV pack is a 2–3S motor.

Do I need a new spur or mount for a 5 mm-shaft motor?

Often yes. Owners report the clean path is a 32P 5 mm pinion with a 32P 42T steel spur and a 40-series adjustable mount, because the stock mount can foul a bigger pinion. Check your parts match before ordering.

Will a 4S battery fit without moving the ESC?

Owners report a 4S 2200 pack fits the stock bay. Larger packs usually need the ESC relocated. Measure your bay first.

How hot is too hot after a run?

If you cannot hold your finger on the motor can for about five seconds (roughly 70 °C / 160 °F), the gearing is too tall or the motor is overloaded.

Is this an official Rlaarlo guide?

No. RcFanz is an independent site and is not affiliated with Rlaarlo.

Sources

Specs come from the maker's manual and spec pages and from ESC makers' manuals. Gearing speeds are calculated; owner experience is paraphrased and labelled as owner reports.