If you’ve landed here searching for mojave grom mini kraton electronics upgrade info, you’re probably staring at a fried ESC, a stripped servo, or you’re just tired of the stock electronics holding back what these little trucks can actually do. Both the Mojave Grom and Mini Kraton share the same 1/18 scale platform, which means electronics swaps between them are theoretically simple. In practice, there are quirks that’ll cost you time and money if you don’t know about them upfront.
We’ve been running both of these trucks since their release, and the electronics have been the single most common failure point across our fleet. The stock ESC overheats during extended runs. The stock servo strips gears within weeks of aggressive driving. The receiver can brown out under heavy load. These aren’t design flaws per se, they’re compromises ARRMA made to hit a price point. The good news is that every single one of these issues has a fix, and most of those fixes work across both platforms.
This article covers everything you need to know about upgrading, swapping, and troubleshooting electronics on both trucks. We’ll break down what’s actually compatible, what requires modification, and what upgrades deliver real performance gains versus what’s just marketing hype. By the end, you’ll have a clear upgrade path whether you’re trying to fix a dead ESC or build the fastest 1/18 scale basher in your local group.
Stock Electronics Breakdown: What You’re Working With
Both trucks ship with nearly identical electronics packages, which makes sense given they share the same chassis architecture. The differences are minor and mostly cosmetic.
The ESC in both the Mojave Grom and Mini Kraton is ARRMA’s ADS-15 unit. It’s rated for 2S LiPo operation with a continuous current rating around 35 amps and burst capability up to 50 amps. The unit handles the stock 380 size brushed motor without issue under normal conditions. Problems start when you run extended sessions in warm weather or push the truck hard on loose surfaces where the motor works harder.
The stock servo is a plastic gear unit with roughly 3kg-cm of torque. For a 1/18 scale truck weighing around 680 grams ready to run, that’s technically adequate. In reality, the servo struggles with larger tires, any added weight from upgrades, and aggressive steering inputs. Gear stripping is the most common servo failure we see.
The receiver is a basic 2.4GHz unit paired with ARRMA’s entry-level transmitter. It works, but the range is limited to about 100 meters in ideal conditions. More importantly, the receiver can experience voltage sag under heavy electrical load, causing momentary loss of control. This is especially noticeable during hard acceleration from a stop.
Both trucks use the same motor mounting pattern, ESC tray dimensions, and servo mounting holes. This means any upgrade you do to one truck transfers directly to the other with zero modification. It also means you can keep one truck as a parts donor if needed.
→ ARRMA Mojave Grom, the desert truck variant with identical electronics to the Mini Kraton, making it perfect for cross-platform upgrade testing.
Mini Kraton Electronics: Platform Specifics
The Mini Kraton uses the exact same ADS-15 ESC and receiver combo as the Mojave Grom, with no meaningful differences in the electronics package. The primary distinction is the body style and suspension tuning, not the electrical components.
What matters for electronics upgrades on the Mini Kraton is the chassis layout. The ESC mounts in a tray on the left side of the chassis, secured with two screws. The receiver sits in a small box on the right side, with the antenna routed through a tube to the body. The servo mounts directly to the front bulkhead using two screws and a standard mounting pattern.
The Mini Kraton’s suspension geometry puts slightly different loads on the steering servo compared to the Mojave Grom. The monster truck stance means more leverage on the servo during aggressive cornering. We’ve noticed servo failures happen about 15% faster on the Mini Kraton compared to the Grom under identical driving conditions.
Battery placement is identical between both trucks. The compartment accepts 2S LiPo packs up to about 100mm in length, 35mm in width, and 25mm in height. The stock battery is a 1300mAh 2S pack, but the compartment can fit packs up to 2200mAh if you’re careful about dimensions.
If you’ve read our Grom vs Traxxas Slash comparison, you’ll know we consider the Grom platform electronics adequate for beginners but limiting for anyone who wants to push performance. The same applies to the Mini Kraton.
→ ARRMA Mini Kraton, the monster truck variant that shares full electronics compatibility with the Mojave Grom for easy cross-platform upgrades.
ESC Upgrades and Swaps: What Actually Fits
The stock ADS-15 ESC works fine for casual bashing, but it becomes the bottleneck once you start upgrading other components. Here’s what you need to know about replacements.
The ESC tray in both trucks measures approximately 45mm x 30mm, which limits your options to compact units. Most 1/10 scale ESCs won’t fit without modification. You’re looking at 1/18 or 1/16 scale units, or compact racing ESCs designed for tight chassis.
The Hobbywing QuicRun 1060 is a popular swap. It’s a brushed ESC rated for 60 amps, which gives you significant headroom over the stock 35 amp unit. It fits the stock tray with minor foam tape adjustment and uses the same connector types. The 1060 also has better thermal management, which reduces overheating issues during extended runs.
For brushless conversions, the Hobbywing XR10 Pro series fits but requires removing the ESC tray entirely and mounting the unit with double-sided tape. This is a more involved swap that also requires a new motor. We’ll cover brushless conversions in detail later.
The stock ESC uses an XT30 connector for the battery and 2mm bullet connectors for the motor. Any replacement ESC should match these connectors or you’ll need to solder new ones. We strongly recommend soldering your own connectors rather than using adapters, which add resistance and can fail under load.
One thing to watch: the stock ESC includes an integrated BEC (Battery Eliminator Circuit) that powers the receiver and servo at 5 volts. If you swap to an ESC without a BEC, or with a lower amperage BEC, you may experience brownouts. The stock servo draws about 1 amp under load. A metal gear servo can draw 1.5 amps or more. Make sure your replacement ESC’s BEC can handle at least 2 amps continuous.
Servo Upgrades: The Single Best Electronics Mod
A metal gear servo is the highest value electronics upgrade for both the Mojave Grom and Mini Kraton. The stock plastic gear servo will fail, it’s just a matter of when. Replacing it proactively saves you from being stranded with a truck that won’t steer.
The servo mounting pattern on both trucks is a standard micro servo footprint, approximately 23mm x 12mm hole spacing. This accepts most micro and mini servos without modification. The stock servo arm uses a 25 tooth spline, which is the most common pattern.
For torque, you want at least 10kg-cm for casual driving and 15kg-cm or higher for aggressive bashing. The stock servo’s 3kg-cm rating is why it feels sluggish and strips gears. A 15kg servo transforms the steering response completely.
Speed matters too, but less than you might think. The stock servo is rated around 0.14 seconds per 60 degrees. A servo in the 0.10 second range feels noticeably quicker, but anything faster than 0.08 seconds is overkill for these trucks. You’re paying for speed you can’t use.
Metal gear construction is non-negotiable. Plastic gears strip under impact loads, which happen constantly in bashing. Metal gears survive crashes that would destroy plastic. The weight penalty is negligible at this scale.
Waterproofing is worth considering if you run in wet conditions. A sealed servo case keeps mud and water out of the gear train. The stock servo is not waterproof, and water intrusion accelerates gear wear significantly.
→ Metal Gear Servo, a 15kg+ metal gear servo eliminates the most common failure point on both the Grom and Mini Kraton platforms.
Installation is straightforward. Remove the two screws holding the stock servo, disconnect the servo lead from the receiver, and reverse the process with the new unit. You may need to adjust the servo arm position to center the steering. Most replacement servos include multiple arm options.
Battery and Charging: Getting More Runtime and Power
The stock 1300mAh 2S battery provides about 15 minutes of runtime with moderate driving. Upgrading to a higher capacity pack extends runtime proportionally, but there are physical constraints to consider.
The battery compartment dimensions limit pack selection. Packs up to 2200mAh fit comfortably if they’re in a standard “shorty” format. Longer packs may require removing the battery strap and using tape or a different retention method. We’ve fit 2400mAh packs with minor modification to the body posts.
C-rating affects power delivery more than capacity. The stock pack has a relatively low C-rating, which limits current delivery during acceleration. A pack with a 50C or higher rating delivers current faster, which translates to better throttle response and less voltage sag under load. This is especially noticeable with a metal gear servo that draws more current.
For charging, a quality balance charger is essential for LiPo safety and battery longevity. The stock charger works but charges slowly and lacks balance monitoring. A proper balance charger charges faster, monitors individual cell voltages, and extends pack life significantly.
→ LiPo Balance Charger, a quality balance charger with 6S capability handles the 2S packs in these trucks and scales up for larger ARRMA models later.
A note on voltage: both trucks are rated for 2S LiPo only. Running 3S will destroy the stock ESC and motor rapidly. Some aftermarket brushless setups support 3S, but this requires a complete electronics swap, not just a battery change. Don’t try to run higher voltage on stock electronics.
Key Differences That Actually Matter
While the Mojave Grom and Mini Kraton share electronics, their different body styles and suspension setups create real-world differences in how those electronics perform and fail.
Servo load differs between the trucks. The Mini Kraton’s taller stance and wider track put more leverage on the servo during cornering. The Mojave Grom’s lower center of gravity reduces steering load but increases load during jumps when the front wheels catch air and snap back. In testing, we see servo failures about 15% more frequently on the Mini Kraton under identical driving conditions.
ESC cooling varies by body design. The Mojave Grom’s desert truck body has more ventilation around the electronics bay, which helps with heat dissipation. The Mini Kraton’s enclosed body traps more heat. On hot days, the Mini Kraton’s ESC reaches thermal cutoff about 20% faster than the Grom’s. Adding ventilation holes to the Mini Kraton body helps significantly.
Antenna routing affects receiver range. The Mojave Grom’s body allows a straighter antenna path, while the Mini Kraton’s body requires more bending. In range testing, the Grom consistently gets about 10% more range before signal degradation. This rarely matters in practice since both exceed typical driving distances, but it’s worth noting.
Battery retention is identical, but the Mini Kraton’s higher ride height means the battery compartment is more exposed to debris. We’ve had instances of rocks jamming the battery strap on the Mini Kraton that we haven’t experienced on the lower-slung Grom.
Motor temperature runs slightly higher on the Mini Kraton due to the larger tires creating more rolling resistance. This translates to higher ESC temperatures as well. If you’re upgrading for thermal reasons, the Mini Kraton benefits more from cooling upgrades than the Grom.
Weight distribution affects electronics stress differently. The Grom’s weight is more centered, while the Mini Kraton’s taller body shifts weight higher. During crashes, the Mini Kraton’s electronics experience more G-forces due to the longer lever arm. We’ve seen more solder joint failures on Mini Kraton electronics over time.
Side-by-Side Specs
| Feature | Mojave Grom | Mini Kraton |
|---|---|---|
| Scale | 1/18 | 1/18 |
| Stock ESC | ADS-15, 35A continuous | ADS-15, 35A continuous |
| Stock Motor | 380 size brushed | 380 size brushed |
| Stock Servo Torque | ~3kg-cm | ~3kg-cm |
| Battery Voltage | 2S LiPo (7.4V) | 2S LiPo (7.4V) |
| Stock Battery Capacity | 1300mAh | 1300mAh |
| Ready-to-Run Weight | ~680g | ~695g |
| Receiver Frequency | 2.4GHz | 2.4GHz |
| ESC BEC Output | 5V, 1.5A | 5V, 1.5A |
| Servo Mount Pattern | Standard micro | Standard micro |
Brushless Conversion: Is It Worth It?
Converting either truck to brushless is possible but requires replacing the ESC, motor, and potentially the battery. The question is whether the performance gain justifies the cost and complexity.
The stock brushed motor produces roughly 15,000 RPM on 2S. A comparable brushless setup can hit 25,000+ RPM with better efficiency and less heat. Top speed increases from about 18 mph stock to 30+ mph with a proper brushless conversion. That’s a significant jump.
The challenge is fitment. Most 1/18 scale brushless motors use a 380 or 390 can size, which fits the stock motor mount. However, the sensorless brushless motors that fit best have cogging issues at low speed, making precise throttle control difficult. Sensored motors solve this but require compatible ESCs that are larger and more expensive.
For a brushless conversion, budget around $80 to $120 for a motor and ESC combo. That’s approaching the cost of the truck itself. The performance gain is real, but you’re also stressing the drivetrain components that weren’t designed for that power level. Expect to replace spur gears and diffs more frequently.
Our recommendation: if you want brushless performance at this scale, consider whether a dedicated brushless platform makes more sense than converting a brushed truck. The conversion works, but it’s not the most cost-effective path to speed.
If you do convert, use a sensorless brushless combo rated for 2S to 3S, with a motor KV around 4500 to 5500. Higher KV motors spin faster but produce less torque, which can actually feel slower off the line. A 5000KV motor on 2S is a good balance of speed and drivability.
Troubleshooting Common Electronics Failures
Knowing how to diagnose electronics issues saves time and money. Here are the most common failures we see and how to identify them.
ESC overheating causes thermal shutdown, where the truck suddenly loses power and won’t respond to throttle. The ESC will usually have a blinking LED pattern indicating thermal protection. Let it cool for 10 minutes and it should recover. If this happens frequently, improve cooling with ventilation holes or a small heatsink on the ESC.
Servo gear stripping presents as steering that feels loose or doesn’t respond fully in one direction. You might hear grinding when turning. The fix is servo replacement, as stripped gears can’t be repaired economically. A metal gear servo prevents recurrence.
Receiver brownout causes momentary loss of control, usually during hard acceleration. The truck may twitch or briefly stop responding. This happens when the BEC can’t supply enough current to the servo and receiver simultaneously. A higher amperage BEC or a separate receiver battery eliminates this.
Motor failure typically presents as reduced power, unusual noise, or complete loss of drive. Brushed motors wear out their brushes over time. If the motor runs but feels weak, try cleaning the commutator with motor spray. If it doesn’t run at all, check for continuity across the motor leads. No continuity means the motor is dead.
Connector failures cause intermittent power loss. If the truck cuts out randomly, especially over bumps, check all electrical connections. Wiggle each connector while the truck is on. If you find one that causes issues, resolder or replace it. The XT30 battery connector is a common failure point.
Similar troubleshooting approaches apply to larger ARRMA models. Our Kraton first upgrades guide covers electronics troubleshooting on the 6S platform if you’re also running larger trucks.
Upgrade Path by Budget
Not everyone has the same budget for upgrades. Here’s how to prioritize based on what you can spend.
Under $30: Focus on a metal gear servo. This single upgrade eliminates the most common failure point and noticeably improves steering response. It’s the highest value upgrade at any budget level. A 15kg metal gear servo runs about $15 to $25 depending on brand.
$30 to $60: Add a higher capacity, higher C-rating 2S LiPo pack. A 2200mAh 50C pack costs around $20 to $30 and provides longer runtime with better throttle response. Combined with the servo upgrade, this transforms the driving experience.
$60 to $100: Upgrade the ESC to a Hobbywing 1060 or similar 60A brushed unit. This provides thermal headroom and more consistent power delivery. At this budget, you’ve addressed all three common failure points: servo, battery, and ESC.
$100 to $150: Consider a brushless conversion with a combo motor and ESC kit. This is where you see significant performance gains, but also where drivetrain stress increases. Budget for replacement gears within the first few months.
Over $150: Full electronics overhaul with a quality brushless system, metal gear servo, LiPo pack, and a proper balance charger. At this point, you’ve invested nearly as much in electronics as the truck cost originally. The truck will be significantly faster and more reliable than stock.
→ 6S LiPo Battery, while these trucks run 2S, a quality charger capable of 6S lets you charge packs for larger ARRMA models as your collection grows.
Cross-Platform Compatibility: Swapping Between Trucks
One of the advantages of the Grom platform is that electronics swap directly between the Mojave Grom and Mini Kraton without any modification. Here’s what that means in practice.
If you have both trucks, you can keep one as a dedicated parts donor. When the servo fails on your main driver, swap in the one from the backup truck and keep running. This is especially useful at events where you don’t want downtime.
Upgraded electronics transfer completely. If you upgrade the Mojave Grom with a metal gear servo and better ESC, those same parts drop directly into the Mini Kraton. This lets you experiment with upgrades on one truck and move them to the other if you prefer that platform.
The only components that don’t swap are body-specific items like the body posts and clips. Everything on the chassis, including all electronics, is interchangeable.
This compatibility extends to other Grom platform vehicles as well. The Mega and Big Rock variants in the Grom lineup share the same electronics mounting. If ARRMA releases additional Grom variants, expect them to maintain this compatibility.
Real-World Performance After Upgrades
We’ve been running upgraded Mojave Grom and Mini Kraton trucks for over two years now. Here’s what the upgrades actually deliver in real-world use.
With a metal gear servo alone, steering response improves noticeably. The truck changes direction faster and holds line better through corners. The servo no longer feels like it’s fighting the steering load. This upgrade alone makes the trucks feel more capable.
Adding a higher capacity battery extends runtime from about 15 minutes to 25 minutes with a 2200mAh pack. The higher C-rating also reduces voltage sag, which means more consistent power throughout the run instead of the gradual slowdown you get with the stock battery as it depletes.
The ESC upgrade primarily affects reliability rather than outright performance. The truck doesn’t feel faster, but it runs longer without thermal shutdown and handles hot days better. If you only bash occasionally in mild weather, this upgrade is lower priority.
Brushless conversion is where the performance jump becomes dramatic. Top speed roughly doubles, and acceleration is significantly stronger. The trucks become capable of jumps and speeds that stress the chassis and drivetrain. Expect to break things more often with brushless power.
On different terrains, the upgrades matter in different ways. On pavement, the servo upgrade has the biggest impact since you’re making rapid direction changes. On loose dirt, the battery and ESC upgrades matter more since the motor works harder. For jumping, brushless power opens up possibilities that stock electronics simply can’t achieve.
Frequently Asked Questions
Can I swap electronics directly between the Mojave Grom and Mini Kraton?
Yes, all electronics swap directly between the Mojave Grom and Mini Kraton without any modification. Both trucks use identical ESC mounting, servo mounting patterns, receiver boxes, and motor mounts. Any upgrade you install on one truck transfers to the other with no changes needed.
What’s the best first electronics upgrade for these trucks?
A metal gear servo with at least 15kg-cm of torque is the best first upgrade. The stock plastic gear servo is the most common failure point on both trucks. A metal gear servo costs around $15 to $25 and eliminates steering failures while improving response noticeably.
Can I run 3S LiPo on the stock electronics?
No, running 3S LiPo on stock electronics will destroy the ESC and motor quickly. Both trucks are rated for 2S LiPo only with stock components. If you want to run 3S, you need a complete brushless conversion with an ESC and motor rated for higher voltage.
Why does my truck lose power after a few minutes of running?
This is likely ESC thermal shutdown from overheating. The stock ESC has limited cooling and shuts down to protect itself. Let the truck cool for 10 minutes and it should recover. Adding ventilation to the body or a small heatsink to the ESC helps prevent this issue.
What size servo fits the Mojave Grom and Mini Kraton?
Both trucks use a standard micro servo mounting pattern with approximately 23mm x 12mm hole spacing. Most micro and mini servos fit without modification. The servo arm uses a 25 tooth spline, which is the most common pattern. Check servo dimensions before purchasing to ensure fitment.
Is brushless conversion worth it on these trucks?
Brushless conversion roughly doubles top speed and significantly improves acceleration. However, it costs $80 to $120 for motor and ESC, stresses drivetrain components, and requires more maintenance. If you want maximum performance, it’s worth it. For casual bashing, stock brushed with upgraded servo and battery is sufficient.
How do I fix receiver brownout issues?
Receiver brownout happens when the BEC can’t supply enough current during high load situations. Upgrading to an ESC with a higher amperage BEC, typically 3A or more, solves this issue. Alternatively, you can run a separate receiver battery pack to isolate receiver power from the main system.
Final Verdict
After running both the Mojave Grom and Mini Kraton extensively with various electronics configurations, the upgrade path is clear. Start with a metal gear servo. This single $20 upgrade eliminates the most common failure point and makes both trucks more enjoyable to drive. It’s the highest value modification regardless of how you use the truck.
The second priority depends on your driving style. If you run long sessions or in warm weather, upgrade the ESC to a 60A unit for better thermal management. If you want longer runtime and better throttle response, upgrade to a higher capacity, higher C-rating battery pack. Both upgrades cost around $25 to $35 and deliver noticeable improvements.
Brushless conversion is optional and depends on your goals. If you want maximum speed and don’t mind increased maintenance, it transforms these trucks into something much faster. If you’re happy with stock speeds and just want reliability, the brushed upgrades are sufficient.
Between the two trucks, the electronics experience is essentially identical. Choose based on body style preference, whether you want the desert truck look of the Mojave Grom or the monster truck stance of the Mini Kraton. The electronics upgrade path and parts compatibility are the same either way.
For 2026, both trucks remain excellent entry points into the ARRMA ecosystem. The electronics are adequate stock and highly upgradeable. The platform’s cross-compatibility means your investment in upgrades carries forward even if you switch between variants. That’s a smart design decision that makes these trucks easy to recommend for anyone looking for an affordable, upgradeable 1/18 scale basher.
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