Yamaha Grizzly 700 Problems

The Yamaha Grizzly 700, a stalwart in the ATV world, is renowned for its reliability and power. However, like any complex machine, it's not immune to issues. Knowing the potential pitfalls can help you troubleshoot problems, maintain your Grizzly effectively, and keep it running smoothly for years to come. This guide dives into common problems experienced by Grizzly 700 owners, offering insights and solutions to keep you on the trails.

So, What Are the Common Grizzly 700 Headaches?

While the Grizzly 700 enjoys a strong reputation, certain issues tend to crop up more frequently than others. Recognizing these common problems is the first step in preventative maintenance and quick repairs. Let's explore some of the most reported issues:

1. EPS (Electronic Power Steering) Troubles:

The Problem: One of the most frequently discussed issues is related to the EPS system. Owners report instances of the EPS failing, resulting in heavy steering and difficulty maneuvering the ATV, especially at low speeds. This can be particularly concerning in challenging terrain. Sometimes the EPS light will illuminate on the dashboard.
Why it Happens: The EPS system is sensitive and can be affected by several factors, including low battery voltage, faulty sensors, damaged wiring, or a failing EPS unit itself. Mud and water intrusion into the system can also cause corrosion and malfunction.
What to Do: First, check your battery voltage and ensure it's within the recommended range. Examine the wiring harness for any signs of damage, corrosion, or loose connections. Clean any mud or debris around the EPS unit and connectors. If the problem persists, you may need to consult a qualified technician to diagnose and potentially replace the EPS unit.

2. Overheating Issues:

The Problem: The Grizzly 700, particularly in hot weather or during strenuous work, can be prone to overheating. This can lead to reduced engine performance, potential damage to engine components, and even complete engine failure if not addressed promptly.
Why it Happens: Overheating can be caused by several factors, including a clogged radiator, low coolant levels, a faulty thermostat, a failing water pump, or excessive mud buildup around the engine.
What to Do: Regularly check your coolant level and ensure it's within the specified range. Clean the radiator fins thoroughly to remove any mud, debris, or insect buildup. Inspect the thermostat and water pump for proper operation. Consider using a coolant additive designed to improve cooling efficiency. If the problem persists, a more thorough inspection of the cooling system is necessary.

3. Stalling and Idle Problems:

The Problem: Some owners experience stalling issues, particularly at idle or low speeds. This can be frustrating and even dangerous, especially when navigating tricky trails or crossing obstacles.
Why it Happens: Stalling and idle problems can stem from a variety of sources, including a dirty air filter, a clogged fuel injector, a faulty idle air control (IAC) valve, a vacuum leak, or even stale fuel.
What to Do: Start by checking and cleaning or replacing the air filter. Add fuel stabilizer to your gas tank. Inspect the fuel injector for clogs and clean it if necessary. Check for vacuum leaks around the intake manifold and hoses. If the problem continues, the IAC valve may need to be cleaned or replaced.

4. Differential Lock Issues:

The Problem: The differential lock is a crucial feature for navigating challenging terrain, providing maximum traction to all four wheels. However, some owners have reported issues with the differential lock engaging or disengaging properly.
Why it Happens: This can be caused by a faulty actuator, damaged wiring, low fluid levels in the differential, or internal damage to the differential itself.
What to Do: Check the fluid level in the differential and top it off if necessary. Inspect the wiring harness and actuator for any signs of damage or corrosion. If the problem persists, the actuator may need to be replaced, or the differential may require a more thorough inspection and repair.

5. Clutch Problems (Primarily on Older Models):

The Problem: Older Grizzly 700 models with the Ultramatic transmission can sometimes experience clutch-related issues, such as slipping, grabbing, or jerking during acceleration.
Why it Happens: These problems can be caused by worn clutch shoes, a worn or damaged one-way bearing, or contamination of the clutch assembly with oil or grease.
What to Do: Inspect the clutch assembly for wear and tear. Clean the clutch surfaces with brake cleaner to remove any contaminants. If the clutch shoes are worn, they will need to be replaced. A faulty one-way bearing will also require replacement.

6. Fuel Pump Failures:

The Problem: The fuel pump is responsible for delivering fuel from the tank to the engine. A failing fuel pump can lead to poor performance, stalling, or a complete inability to start the ATV.
Why it Happens: Fuel pumps can fail due to age, contamination of the fuel with debris, or running the ATV with a consistently low fuel level, which can cause the pump to overheat.
What to Do: Check the fuel pump relay and fuse. If they are good, test the fuel pump's voltage and amperage. If the pump is not receiving power or is drawing excessive current, it may need to be replaced.

7. Starter Problems:

The Problem: Difficulty starting the engine, clicking sounds when attempting to start, or a complete failure to start are all signs of potential starter problems.
Why it Happens: Starter problems can be caused by a weak battery, corroded battery terminals, a faulty starter solenoid, or a failing starter motor.
What to Do: Start by checking the battery voltage and ensuring it's fully charged. Clean the battery terminals and ensure they are securely connected. Check the starter solenoid for proper operation. If the problem persists, the starter motor may need to be replaced.

8. Suspension Issues:

The Problem: The Grizzly 700's suspension is designed to provide a comfortable and controlled ride. However, over time, the shocks and bushings can wear out, leading to a rough ride, poor handling, and excessive body roll.
Why it Happens: Suspension components are subjected to constant stress and exposure to the elements. Regular use, especially in rough terrain, accelerates wear and tear.
What to Do: Inspect the shocks for leaks or damage. Check the bushings for wear and tear. Replace worn shocks and bushings as needed to restore proper suspension performance.

9. Brake Problems:

The Problem: Weak braking performance, squealing brakes, or a spongy brake lever are all signs of potential brake problems.
Why it Happens: Brake problems can be caused by worn brake pads, contaminated brake fluid, air in the brake lines, or damaged brake rotors.
What to Do: Check the brake pad thickness and replace them if they are worn. Bleed the brake lines to remove any air. Flush the brake fluid and replace it with fresh fluid. Inspect the brake rotors for damage and replace them if necessary.

10. Corrosion:

The Problem: ATVs, especially those used in wet or muddy conditions, are susceptible to corrosion. Corrosion can damage wiring harnesses, connectors, and other metal components, leading to a variety of problems.
Why it Happens: Exposure to water, mud, and salt accelerates corrosion.
What to Do: Regularly wash and clean your Grizzly 700, paying particular attention to hard-to-reach areas. Use a corrosion inhibitor spray to protect metal components. Inspect wiring harnesses and connectors for signs of corrosion and clean them as needed.

Proactive Steps to Keep Your Grizzly Purring

While problems can arise, many can be prevented with regular maintenance and careful operation. Here are some key steps to keep your Grizzly 700 in top condition:

Regular Oil Changes: Follow the manufacturer's recommended oil change intervals. Use high-quality oil designed for ATVs.
Air Filter Maintenance: Clean or replace the air filter regularly, especially if you ride in dusty conditions.
Coolant Checks: Regularly check the coolant level and top it off as needed. Flush and replace the coolant every two years.
Grease Fittings: Grease all grease fittings regularly to lubricate suspension and steering components.
Tire Pressure: Maintain proper tire pressure for optimal handling and tire life.
Battery Maintenance: Keep the battery terminals clean and corrosion-free. Use a battery tender to maintain the battery's charge during periods of inactivity.
Inspect and Clean: Regularly inspect your Grizzly 700 for any signs of damage, wear, or leaks. Clean off mud and debris after each ride.
Use Fuel Stabilizer: Add fuel stabilizer to the fuel tank, especially if you plan to store the ATV for an extended period.

Frequently Asked Questions

Why is my Grizzly 700 overheating? Overheating can be caused by a clogged radiator, low coolant, or a faulty thermostat. Ensure the radiator is clean and the coolant level is correct.
What should I do if my EPS light comes on? Check your battery voltage and inspect the EPS wiring for damage. If the problem persists, consult a technician.
My Grizzly stalls at idle. What could be the problem? A dirty air filter, clogged fuel injector, or faulty IAC valve can cause stalling. Clean or replace the air filter and consider cleaning the fuel injector.
How often should I change the oil in my Grizzly 700? Refer to your owner's manual for the recommended oil change intervals, typically every 100 hours of operation.
Why is my differential lock not engaging? Check the differential fluid level and inspect the actuator for damage. Low fluid or a faulty actuator could be the cause.

The Bottom Line

While the Yamaha Grizzly 700 is a reliable ATV, understanding its potential problems and implementing preventative maintenance is crucial for long-term performance. By addressing issues promptly and following a regular maintenance schedule, you can keep your Grizzly 700 running smoothly and enjoy countless hours on the trails. Remember, a little proactive care goes a long way in preventing major headaches down the road.