The Arctic Cat T660, with its smooth-running four-stroke engine, promised a reliable and comfortable snowmobiling experience. While many owners have enjoyed countless miles of winter fun on this machine, the T660 isn't without its quirks. Knowing the potential pitfalls can save you time, money, and frustration, ensuring your T660 continues to purr like a (turbocharged) kitten on the trails.

So, What Troubles Lurk Under the Hood?

Let's be honest, no snowmobile is perfect. The T660, while generally dependable, has a few known issues that tend to crop up more often than others. Understanding these common problems is the first step in preventing them or, at least, being prepared when they arise.

The Dreaded Turbo Lag: This is perhaps the most talked-about characteristic of the T660 Turbo models. Turbo lag refers to the delay between when you hit the throttle and when the turbocharger kicks in, delivering that extra burst of power. While some lag is inherent in any turbocharged engine, the T660's can feel more pronounced, especially at lower RPMs.

  • Why it happens: The turbocharger needs exhaust gas to spin up to speed. At low RPMs, there isn't enough exhaust flow to get the turbo spooling quickly.
  • What you can do: Some aftermarket modifications, like different turbochargers or boost controllers, can reduce lag. However, these can be expensive and may affect the engine's reliability. The simplest solution is often to anticipate the lag and adjust your riding style accordingly. Keeping the engine in a higher RPM range can help maintain turbo boost.

Heat Exchanger Woes: Overheating can be a significant problem, especially in low-snow conditions. The T660's heat exchangers, responsible for dissipating engine heat, can struggle to keep the engine cool when there isn't enough snow being kicked up to them.

  • Signs of overheating: The temperature gauge will climb into the red zone, and the engine may start to lose power or even shut down completely.
  • Solutions:
    • Ice scratchers: These attach to the rear suspension and kick up ice and snow onto the track and heat exchangers. A must-have for low-snow riding.
    • Aftermarket heat exchangers: Larger or more efficient heat exchangers can provide better cooling capacity.
    • Coolant level: Ensure the coolant level is correct and that there are no leaks in the cooling system.
    • Snow deflectors: Adding deflectors to the tunnel can help direct more snow onto the heat exchangers.

Electrical Gremlins: Like many modern snowmobiles, the T660 has a complex electrical system. This complexity can sometimes lead to frustrating electrical issues.

  • Common problems:

    • Battery drain: If the battery is constantly draining, it could be a sign of a parasitic draw, meaning something is drawing power even when the snowmobile is turned off.
    • Sensor failures: Sensors, such as the throttle position sensor (TPS) or crankshaft position sensor (CKP), can fail, causing the engine to run poorly or not start at all.
    • Wiring harness issues: Damaged or corroded wiring can cause all sorts of problems. Rodents love to chew on wiring harnesses, especially during the off-season.

  • Troubleshooting tips:

    • Check the battery: Make sure the battery is fully charged and in good condition.
    • Inspect the wiring: Look for any signs of damage or corrosion.
    • Use a multimeter: A multimeter can be used to test for voltage and continuity in the electrical system.
    • Consult a service manual: The service manual contains detailed wiring diagrams and troubleshooting procedures.

Fuel System Foibles: Problems with the fuel system can also cause issues, ranging from poor performance to complete engine failure.

  • Fuel pump failures: The fuel pump is responsible for delivering fuel to the engine. If it fails, the engine will starve for fuel and won't run properly.

  • Fuel injector problems: Clogged or malfunctioning fuel injectors can disrupt the fuel-air mixture, leading to poor performance, rough idling, or even engine damage.

  • Fuel filter issues: A clogged fuel filter can restrict fuel flow and cause the engine to run lean.

  • Old Fuel: Fuel left sitting in the tank for extended periods can degrade, leading to starting issues and poor engine performance.

  • Prevention & Solutions:

    • Use fresh fuel: Avoid using old or stale fuel. Add fuel stabilizer to the tank before storing the snowmobile for the off-season.
    • Replace the fuel filter regularly: This will help prevent clogs and ensure proper fuel flow.
    • Clean or replace fuel injectors: If the injectors are clogged, they can be cleaned or replaced.
    • Check the fuel pump pressure: A fuel pressure gauge can be used to check the fuel pump pressure.

Suspension Sag: Over time, the suspension components can wear out, leading to a loss of ride quality and handling.

  • Shock absorber wear: Shock absorbers lose their damping ability over time, resulting in a bouncy ride.

  • Spring sag: Springs can sag over time, reducing ground clearance and affecting handling.

  • Bushing wear: Worn bushings can cause excessive play in the suspension, leading to sloppy handling.

  • Maintenance and Upgrades:

    • Rebuild or replace shock absorbers: Shock absorbers can be rebuilt or replaced to restore their damping ability.
    • Replace springs: Springs can be replaced to restore ride height and handling.
    • Replace bushings: Worn bushings should be replaced to eliminate play in the suspension.
    • Grease fittings: Regularly grease the suspension fittings to keep them lubricated and prevent wear.

Specific Model Year Quirks (and How to Handle Them)

While the T660 shared a common engine and basic design throughout its production run, certain model years had their own specific issues. Knowing these quirks can help you pinpoint potential problems on your particular machine.

  • Early Models (2004-2005): These models sometimes experienced issues with the stator, a component of the electrical system that generates power for the engine. If you're experiencing intermittent starting problems or battery drain, the stator might be the culprit.
  • Mid-Production Models (2006-2007): Some owners reported issues with the reverse gear mechanism on these models. If you're having trouble engaging reverse, check the linkage and the reverse actuator.
  • Later Models (2008-2009): While generally more refined, these models could still experience the common issues mentioned earlier, such as turbo lag and overheating.

Preventing Problems Before They Start: A T660 Maintenance Checklist

The best way to deal with T660 problems is to prevent them from happening in the first place. Regular maintenance is key to keeping your snowmobile running smoothly and reliably.

  • Pre-Season Inspection: Before the snow flies, give your T660 a thorough inspection. Check the fluid levels, inspect the belts and hoses, and make sure all the electrical connections are clean and tight.
  • Regular Oil Changes: Change the oil and filter according to the manufacturer's recommendations. This will help keep the engine running smoothly and prevent wear.
  • Grease the Suspension: Grease the suspension fittings regularly to keep them lubricated and prevent wear.
  • Check the Track: Inspect the track for damage and make sure it's properly tensioned.
  • Clean the Carburetors (if applicable): If your T660 has carburetors, clean them periodically to prevent clogs. (Note: Most T660s are fuel-injected, but some earlier models may have carburetors).
  • Store Properly: During the off-season, store your T660 in a cool, dry place. Add fuel stabilizer to the tank to prevent fuel degradation and disconnect the battery to prevent it from draining.

Frequently Asked Questions (FAQ)

  • Why is my T660 overheating? Overheating is often due to insufficient snow on the heat exchangers. Try adding ice scratchers or aftermarket heat exchangers for better cooling.
  • What causes turbo lag on the T660 Turbo? Turbo lag is inherent in turbocharged engines, especially at low RPMs. Consider aftermarket modifications or adjust your riding style to compensate.
  • My T660's battery keeps draining. What could be the problem? A parasitic draw could be draining the battery, or the stator may be faulty. Inspect the wiring and check the stator output.
  • How often should I change the oil on my T660? Refer to your owner's manual, but generally, an oil change every season or every 1000 miles is recommended.
  • What type of fuel should I use in my T660? Use the fuel grade recommended in your owner's manual. Avoid using fuel with ethanol if possible, or use a fuel stabilizer.

The Bottom Line

The Arctic Cat T660, despite some potential issues, remains a solid choice for riders seeking a comfortable and reliable snowmobiling experience. By understanding the common problems and implementing a proactive maintenance plan, you can keep your T660 running strong for years to come. Regular maintenance and prompt attention to potential issues are key to enjoying your snowmobile for many winters to come.