Ever watch your young rider zip around on their Can-Am DS 90 and wonder, “Just how fast is that thing really going?” You’re not alone. It’s a question every parent or guardian asks, and the answer is more important than you might think.
Understanding the Can Am DS 90 top speed isn’t just about satisfying curiosity. It’s about safety, responsible riding, and knowing how to manage the machine as your child grows in skill and confidence. This little ATV is a fantastic learning tool, but its performance needs to match the rider’s ability.
Imagine being able to confidently set limits for a brand-new rider, and then responsibly unleash a bit more performance as they become a seasoned trail explorer. This guide will give you that control and knowledge.
Let’s dive into everything you need to know, from the out-of-the-box speed limits to the simple checks and tweaks that make a real difference on the trail.
What is the Stock Can-Am DS 90 Top Speed?
First things first, let’s get a baseline. The Can-Am DS 90 is designed with safety as its number one priority. Straight from the factory, it’s not built to be a speed demon, but a reliable and controllable machine for young riders.
The DS 90 comes with a built-in, adjustable speed limiting system. This gives you, the supervising adult, total control over its performance. Its top speed falls into two main categories:
- Restricted: With the factory throttle limiter engaged, you can dial the top speed down to a walking pace, around 10 mph (16 km/h). This is the perfect setting for a first-time rider learning the basics of throttle control and steering.
- Unrestricted: Once you fully back out the throttle limiter screw and remove other factory restrictions (more on that later), the DS 90 can reach a top speed of approximately 25-30 mph (40-48 km/h).
Keep in mind, these numbers can vary. Factors like rider weight, terrain (grass vs. dirt vs. pavement), and even tire pressure can slightly alter the real-world top speed.
The Throttle Limiter: Your Best Friend for Rider Safety
The single most important feature for managing the DS 90’s speed is the throttle limiter screw. Think of it as an adjustable “gas pedal stop.” It physically prevents the thumb throttle from being pushed all the way, limiting how much fuel and air the engine gets.
Adjusting it is one of the easiest and most critical parts of this can am ds 90 top speed guide. Here’s how to do it.
How to Adjust the Throttle Limiter
- Locate the Limiter: Find the thumb throttle assembly on the right-hand handlebar. On the front of the housing, you’ll see a small screw, often with a lock nut around it. That’s your target.
- Gather Your Tools: You’ll typically need two wrenches. An 8mm or 10mm wrench usually works for the lock nut, and a Phillips head screwdriver or another wrench for the screw itself.
- Loosen the Lock Nut: Hold the screw in place and turn the lock nut counter-clockwise just enough to loosen it. Don’t remove it completely.
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Set the Speed: Turn the screw to adjust the speed.
- To decrease speed, turn the screw clockwise (in). This reduces how far the throttle can be pushed.
- To increase speed, turn the screw counter-clockwise (out). This allows for more throttle travel.
- Test and Tighten: Have the rider test the new setting in a safe, open area. Once you’re happy with the speed, hold the screw in place and tighten the lock nut clockwise to secure your setting.
Pro Tip: For a brand-new rider, screw the limiter all the way in. As they demonstrate control and follow the rules, you can back it out a quarter-turn at a time, gradually increasing their speed along with their skills.
Common Problems Affecting Can Am DS 90 Top Speed and Performance
Is your DS 90 feeling sluggish or not reaching the speed it used to? Before you think about performance mods, run through this checklist. These are the most common problems with can am ds 90 top speed that we see in the shop.
Clogged Air Filter
The engine needs to breathe. A dirty, clogged air filter suffocates the engine, robbing it of power and speed. This is the #1 culprit for poor performance on any off-road machine.
The Fix: Remove the seat, open the airbox, and inspect the foam filter. If it’s caked in dirt, clean it with filter cleaner and water, let it dry completely, and then re-oil it with proper foam filter oil.
Fouled Spark Plug
A weak or fouled spark plug can cause hard starting, sputtering, and a noticeable lack of power. It’s a small part that makes a huge difference.
The Fix: Use a spark plug socket to remove the plug. If the tip is black, oily, or corroded, it’s time for a new one. They are inexpensive, so it’s good practice to keep a spare. The correct plug is a NGK CR7HSA.
Old or Gummy Fuel
Gasoline, especially with ethanol, can go bad in as little as a month. Old fuel can clog the tiny jets in the carburetor, starving the engine for fuel and crippling its performance.
The Fix: If the ATV has been sitting, drain the old fuel from the tank and carburetor bowl. Refill with fresh, non-ethanol (if possible) premium gasoline. Using a fuel stabilizer during storage is one of the best can am ds 90 top speed best practices.
CVT Belt or Clutch Wear
The DS 90 uses a Continuously Variable Transmission (CVT). Over time, the drive belt can wear down and slip, or the rollers in the clutch can develop flat spots. This prevents the transmission from shifting correctly and reaching its top ratio.
The Fix: This is a more involved job. It requires removing the CVT cover to inspect the belt for glazing or cracks and checking the clutch rollers for wear. If you’re not comfortable with this, it might be a job for your local shop.
A Practical Can Am DS 90 Top Speed Care Guide
Consistent performance comes from consistent maintenance. A well-cared-for machine will always run better and last longer. Following this simple can am ds 90 top speed care guide will ensure the ATV is always ready for the trail.
Check Your Tire Pressure
This is so simple, but so often overlooked. Underinflated tires create huge rolling resistance, which kills top speed and makes the engine work harder. Check the pressure before every ride. The recommended pressure is typically 3.0 psi in both front and rear tires.
Keep the Chain Clean and Lubed
A dry, rusty, or overly tight chain creates drag on the drivetrain. Clean the chain with a chain-safe cleaner and a soft brush, then apply a quality chain lube. Check the tension—it should have about 1 inch of slack.
Regular Oil Changes
Clean oil is the lifeblood of this little air-cooled engine. It lubricates, cleans, and helps cool the internal components. Change the oil and clean the oil screen regularly according to the owner’s manual schedule. This promotes a sustainable can am ds 90 top speed by protecting engine health.
How To (Responsibly) Increase the Can-Am DS 90 Top Speed
Okay, your rider has mastered the basics, they’re wearing all their gear, and you’re ready to unlock a bit more performance. There are a few well-known factory restrictions you can remove to let the engine breathe and perform as it was designed to.
SAFETY WARNING: These modifications should only be performed for riders who have demonstrated excellent control and responsible riding habits. Increased speed requires increased skill. Always test in a safe, open area after any modification.
Step 1: Removing the Exhaust Restrictor
There is a small washer-like restrictor inside the header pipe where it bolts to the engine cylinder. This restricts exhaust flow to limit power.
- How to do it: Unbolt the two nuts holding the exhaust pipe to the engine. As you pull the pipe away, look inside the end of the pipe. You’ll see the restrictor. It’s usually just tacked in with a small weld. A screwdriver and a light tap from a hammer will typically pop it right out. Re-install the pipe with a new exhaust gasket.
Step 2: Removing the CVT Collar/Spacer
This is the biggest restriction. Inside the front clutch (the variator), there is a spacer on the shaft that prevents the two halves of the pulley from closing completely. This physically limits the transmission from reaching its highest gear ratio.
- How to do it: This requires removing the CVT cover. You’ll need an impact wrench and a variator holding tool to remove the front nut. Once the outer pulley half is off, you’ll see a sleeve (the boss) that the pulley slides on. The restrictor is a collar or a shoulder built into this boss. Replace it with a smooth, unrestricted boss from an aftermarket performance kit. This one modification can add 5-10 mph to the top speed.
Step 3: Aftermarket Upgrades
If you’ve done the above and still want more, the next steps involve buying parts.
- Performance Exhaust: A full aftermarket exhaust system will improve flow even more.
- Jet Kit: When you improve airflow with intake and exhaust mods, you need to add more fuel. A carburetor jet kit allows you to tune the fuel mixture for maximum power.
- Performance Clutch: Aftermarket clutches use different roller weights and spring rates to keep the engine in its powerband longer, improving both acceleration and top speed.
Frequently Asked Questions About the Can-Am DS 90 Top SpeedHow fast does a stock Can-Am DS 90 go?
A stock Can-Am DS 90 can be adjusted. With its throttle limiter, it can be set as low as 10 mph. With the limiter fully open and factory restrictions in place, it will typically run around 15-20 mph. Fully de-restricted, it can reach 25-30 mph.
Is the Can-Am DS 90 a 2-stroke or 4-stroke?
The Can-Am DS 90 has a reliable and easy-to-maintain 89.5cc 4-stroke, air-cooled engine. This means you don’t have to worry about mixing gas and oil.
How do I make my DS 90 faster for free?
The two “free” performance mods are removing the exhaust header restrictor and removing or replacing the CVT variator collar. These two steps will unlock the majority of the machine’s hidden potential without costing you a dime in parts.
What age is a Can-Am DS 90 for?
Can-Am recommends the DS 90 for riders aged 10 and up. However, parental supervision and judgment are key. The machine’s adjustability makes it suitable for supervised beginners who fit the machine physically.
Can an adult ride a Can-Am DS 90?
While an adult can technically sit on it and ride it around the yard, it’s not recommended. The frame, suspension, and brakes are all designed for a rider under about 150 lbs. An adult’s weight will over-stress these components.
The Can-Am DS 90 is an incredible machine for introducing a young person to the joys of off-roading. Managing its speed is a blend of simple mechanical adjustments and smart, attentive supervision. By starting slow, performing regular maintenance, and matching the quad’s performance to your rider’s skill, you’re setting them up for a lifetime of safe and fun adventures.
Now get those tools out, make those checks, and most importantly, have a blast making memories on the trail. Ride safe!
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