So, you’ve got a Polaris RZR 170. It’s an awesome machine for getting the next generation of riders hooked on the thrill of the trail. You’ve watched your young gun master the basics, and now you’re both looking at that little UTV and thinking the same thing: “Can we get just a little more out of it?” You’re not alone. It’s a common point every RZR 170 owner reaches.
You’ve come to the right place. We promise this is your definitive, no-fluff guide to understanding the factory-limited polaris rzr 170 top speed and how to safely and reliably increase it. We’ll walk you through everything from simple, free adjustments to the best performance mods, all while keeping safety and engine health as our top priorities.
In this guide, we’ll cover the stock speed limitations, a step-by-step approach to modifications, common problems to avoid, and the essential maintenance needed to keep your souped-up 170 running strong. Let’s get wrenching.
What is the Stock Polaris RZR 170 Top Speed? (And Why Is It Limited?)
Right out of the box, a stock Polaris RZR 170 is electronically and mechanically limited. You can typically expect a top speed of around 25 mph. While this might seem slow to an experienced rider, it’s a crucial safety feature designed by Polaris for its target audience: young, developing drivers.
Polaris wisely built in several limiters to ensure a safe learning curve. Understanding these is the first step in unlocking more performance. The main culprits holding your RZR 170 back are:
- The Throttle Limiter Screw: This is a simple screw that physically prevents the gas pedal from being pushed all the way down. It’s the most common and easiest adjustment to make.
- The CDI Rev Limiter: The CDI (Capacitor Discharge Ignition) box is the machine’s electronic brain. It’s programmed with a rev limit to prevent the engine from spinning too fast, which also caps the top speed.
- CDI Jumper (On some models): Certain model years have a jumper wire on the CDI that, when connected, engages an even lower speed limit (around 15 mph).
Remember, these aren’t flaws; they are deliberate safety features. The goal is to adjust them responsibly as a rider’s skill and comfort level grows.
The First Steps: Simple & Reversible Speed Adjustments
Before you start ordering parts, there are a couple of free, simple things you can do to get a little more speed. This is the perfect starting point in our polaris rzr 170 top speed guide, as it allows for incremental changes.
Adjusting the Throttle Limiter Screw
This is the easiest “mod” you can perform and should be the very first thing you check. It gives you direct control over how much throttle the rider can use.
- Locate the Screw: You’ll find it behind the gas pedal assembly. It’s a long screw with a lock nut that makes contact with the pedal arm, stopping its travel.
- Loosen the Lock Nut: You’ll need a wrench (typically 10mm) to loosen the nut holding the screw in place.
- Back Out the Screw: Using a Phillips head screwdriver or the appropriate tool, back the screw out. The further you back it out, the more the gas pedal can be depressed.
- Test and Tighten: Make small adjustments at a time. Back it out a few turns, tighten the lock nut, and have the rider test it in a safe, open area. Find a speed that matches their ability, then securely tighten the lock nut.
This single adjustment can often get you close to that 25 mph limit if it was previously restricted for a brand-new rider.
Checking the CDI Jumper (Applicable Models)
Some earlier RZR 170 models had a simple wire jumper on the CDI module. When this wire is connected, it puts the machine in a “beginner” mode.
To check for it, locate the CDI box (usually under the driver’s seat or in that vicinity). If you see a single wire with a bullet connector that is plugged into itself or another wire, that could be your limiter. Unplugging it can disable the lower speed limit. Note: Not all models have this, so don’t be alarmed if you can’t find it on your machine.
How to Increase Polaris RZR 170 Top Speed with Performance Mods
Once you’ve maxed out the free adjustments, it’s time to look at aftermarket parts. We’ll break this down into stages, from simple bolt-ons to more involved work. This is where you’ll find the most significant benefits of polaris rzr 170 top speed increases.
Stage 1: Breathing Mods – Air Intake & Exhaust
An engine is basically an air pump. The more air you can efficiently move through it, the more power it makes. That’s why the intake and exhaust are the logical first upgrades.
- Performance Air Intake: Swapping the restrictive stock airbox for a high-flow filter and intake tube allows the engine to breathe in more easily. This simple mod can improve throttle response and add a small amount of power.
- Aftermarket Exhaust: A performance exhaust does the same for the “exhale.” It reduces backpressure, allowing exhaust gases to escape more freely. This typically adds a few mph and gives the RZR a much better sound.
CRITICAL NOTE: If you change the intake or exhaust, you MUST re-jet the carburetor. The stock jetting is matched to the stock airflow. More air without more fuel creates a lean condition, which can cause the engine to run hot and lead to catastrophic failure. You’ll need a jet kit and some patience to get it dialed in perfectly.
Stage 2: Drivetrain & Gearing Upgrades
The RZR 170 uses a CVT (Continuously Variable Transmission). Upgrading its components can make a huge difference in how it puts power to the ground.
- Performance Clutch Kit: An aftermarket clutch kit, with different weights and springs, can improve acceleration and back-shifting. It helps keep the engine in its optimal powerband, making the UTV feel much quicker.
- Sprocket Changes: This is a classic way to trade torque for top speed. By installing a larger front sprocket or a smaller rear sprocket, you change the final drive ratio. This will increase your theoretical top speed but will sacrifice some low-end grunt for climbing hills.
Stage 3: Unlocking the Brain – Performance CDI Box
This is one of the most effective mods for top speed. An aftermarket performance CDI box typically does two things:
- It advances the ignition timing for a more powerful combustion event.
- Most importantly, it removes the factory rev limiter.
By allowing the engine to rev higher, you directly increase the potential wheel speed in the CVT. Combining a CDI with intake, exhaust, and proper jetting can push a RZR 170 well into the 30-35 mph range.
Common Problems with Polaris RZR 170 Top Speed Modifications
Chasing speed is fun, but it’s easy to run into issues. Being aware of these common problems with polaris rzr 170 top speed mods will save you headaches and money.
Carburetor Jetting Nightmares
We mentioned it before, but it’s worth repeating. Improper jetting is the #1 reason people have issues after installing an intake or exhaust. Symptoms of bad jetting include:
- Bogging: The engine hesitates or stumbles when you give it gas.
- Backfiring: Popping sounds from the exhaust, especially on deceleration.
- Overheating: A lean condition generates excessive heat that can damage pistons and valves.
Pro Tip: When jetting, start rich (a larger main jet) and work your way down. It’s safer to run slightly rich than dangerously lean.
Forgetting the Supporting Mods
More speed is useless if you can’t control it. As you make the RZR 170 faster, you absolutely must consider upgrading other systems.
- Brakes: The stock brakes are adequate for stock speeds. At 35+ mph, you’ll want to invest in better brake pads for improved stopping power.
- Suspension: Higher speeds on rough trails will quickly overwhelm the stock shocks. Upgraded shocks will provide a more stable, predictable, and safe ride.
- Tires: Better tires can provide more grip for both acceleration and braking, adding another layer of safety.
The Polaris RZR 170 Top Speed Care Guide: Best Practices for Reliability
A modified engine is a stressed engine. To ensure your RZR 170 remains reliable, you need to step up your maintenance game. Following this polaris rzr 170 top speed care guide is non-negotiable.
Regular Oil Changes are Paramount
More RPMs and more power mean more heat and friction. Change the engine oil and filter more frequently than the owner’s manual suggests for a stock machine. Use a high-quality synthetic oil designed for air-cooled 4-stroke engines.
Keep the Air Filter Spotless
Your high-flow air filter is only effective when it’s clean. After every dusty ride, inspect and clean your air filter per the manufacturer’s instructions. A dirty filter restricts airflow, killing the performance you just paid for.
Chain and Sprocket Maintenance
With new sprockets and more power, your chain is working harder. Keep it clean, properly lubricated with a quality chain lube, and adjusted to the correct tension. A neglected chain will wear out your sprockets quickly.
Sustainable and Eco-Friendly Polaris RZR 170 Top Speed Considerations
When we talk about a sustainable polaris rzr 170 top speed, we’re talking about longevity and responsibility. A “sustainable” setup is one that doesn’t grenade your engine in a month. This means taking the time to tune it correctly and not just bolting on parts.
An eco-friendly polaris rzr 170 top speed approach is about being a good steward of the trails. This means ensuring your machine isn’t leaking fluids, using an exhaust with a USFS-approved spark arrestor to prevent fires, and properly jetting the carb to ensure a clean, efficient burn rather than spewing unburnt fuel into the atmosphere.
Frequently Asked Questions About Polaris RZR 170 Top Speed
How fast is a stock Polaris RZR 170?
A stock Polaris RZR 170 is limited to a top speed of approximately 25 mph. This can be further restricted for younger riders using the built-in throttle limiter screw.
Can I make my RZR 170 faster for free?
Yes, to an extent. The first step is to adjust the throttle limiter screw located behind the gas pedal. Backing this screw out allows for more pedal travel and can unlock the machine’s full stock speed of around 25 mph at no cost.
What is the first mod I should do to increase speed?
After adjusting the throttle screw, the most effective first modification is a performance CDI box. It removes the factory rev limiter, which is the main electronic barrier to achieving higher speeds. However, for the best results, it should be paired with an intake, exhaust, and proper carburetor re-jetting.
Is increasing the top speed safe for my child?
This depends entirely on the rider’s skill, experience, and maturity. Safety should always be the top priority. Only increase the speed incrementally as the rider demonstrates they can safely handle the current performance level. Always ensure they wear a helmet and proper safety gear, and consider upgrading brakes and suspension to match any speed increases.
Do I need to re-jet my carburetor after an intake or exhaust mod?
Yes, absolutely. This is one of the most critical polaris rzr 170 top speed tips. Adding a high-flow intake or exhaust allows more air into the engine. You must increase the fuel flow by installing larger jets in the carburetor to match this new airflow. Skipping this step will cause a lean fuel mixture, leading to overheating and severe engine damage.
Unlocking the full potential of the Polaris RZR 170 is a rewarding project that can grow with your young rider. By starting with simple adjustments, moving to modifications thoughtfully, and prioritizing maintenance and safety, you can build a machine that’s both thrilling and reliable.
Remember to match the power to the rider’s ability, always put safety first, and don’t forget the supporting mods like brakes and suspension. Now you have the knowledge to get it done right.
Wrench safely, ride smart, and have a blast on the trails! – The FatBoysOffroad Team
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