Mercedes Mullins
The Arctic Cat 650 V2 is a powerful snowmobile, ATV, or sled, depending on the model. Like any vehicle, it requires regular maintenance and occasional repairs. One common issue that owners of the 650 V2 face is confusion over the routing of the fuel lines and coolant lines, which can be difficult to get right without a diagram or manual. This is made more challenging by the fact that some models do not have a fuel filter, which can lead to problems with the fuel pump and carburetors.
| Characteristics | Values |
|---|---|
| Fuel pump | Works with a pressure shut-off |
| Fuel line | Air bubbles present |
| Carburetor | Needs to be cleaned |
| Fuel filter | Required |
| Choke | Requires full measure for rear cylinder |
| Coolant lines | Two connections on the right side of the carb |
| Overflow lines | Present |
| Fuel pump assembly | Costs around $700 |
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What You'll Learn
Fuel pump issues
The Arctic Cat 650 V2 is a snowmobile that has been discussed in online forums for its fuel pump issues. One common problem is the high cost of the pump, with dealers charging $692 for a new pump, while online prices are only slightly cheaper at $505. This has led to owners seeking cheaper alternatives, such as a 650-1100 V-Star pump, or a Mustang pump, which can be found on eBay for under $50.
Another issue is the pump's failure to reactivate after draining the fuel from the float bowls. Typically, when a fuel pump works with a pressure shut-off, opening the carb drains should cause the pump to start pumping again until fuel line pressure is sensed, at which point the pump shuts off. However, some users have experienced that their fuel pump does not restart after draining, leading to confusion about how fuel is delivered to the carbs when the machine is running or when the starter is engaged.
Some users have also reported problems with the fuel lines not being hooked up correctly, causing the machine to die when hitting the gas. They have sought help from forums and YouTube videos to understand the correct configuration of the lines, with reference to diagrams.
Coolant routing is another area of concern for the Arctic Cat 650 V2. Owners have sought guidance on how the coolant lines connect to the carburetors, with some providing pictures to aid others facing similar issues.
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Fuel filter installation
To install a fuel filter on your Arctic Cat 650 V2, you will need to purchase a suitable inline fuel filter. This is an important component to ensure the smooth running of your vehicle and to prevent fuel line confusion.
Firstly, locate the fuel line. This can be found by looking at the right side of the carb, where you will see the coolant line and the overflow lines. You should also be able to see the main fuel line connected to the carbs, and the top of the fuel filter.
Next, you will need to disconnect the fuel line from the carb. Be careful to place a cloth or container underneath to catch any spilled fuel. Once disconnected, you can install the new inline fuel filter by clamping it securely into the fuel line. Ensure that the filter is installed in the correct direction, with the arrow on the filter pointing towards the carb.
Now, reconnect the fuel line to the carb, again taking care not to spill any fuel. Ensure that all connections are tight and secure before starting the engine.
Finally, start the engine and check for any leaks in the fuel line. If there are no leaks, your new fuel filter is installed correctly and you're good to go!
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Coolant line routing
When it comes to coolant line routing for the Arctic Cat 650 V2, there are a few things to keep in mind. Firstly, on the right-hand side of the carb, you will find four different connections. Two of these are for the coolant lines, which form a "Y" shape. One of these coolant lines should be connected to the rear cylinder, while the other comes from the water pump.
It is important to refer to the service manual for your specific model when routing the coolant lines. Diagrams and pictures can be extremely helpful in understanding the correct routing. One user has provided pictures of their coolant line routing from the right side, showing the coolant line with a plastic bulb and the overflow lines going down.
Another user has provided pictures of their carbs from the rear, with the seat removed. In these pictures, you can see the main fuel line connected to the carbs and the top of the fuel filter. This can be helpful in understanding the overall layout of the fuel and coolant lines.
Additionally, it is important to pay attention to the choke when working on the coolant line routing. The choke may require its full measure to get the front carb to receive the necessary gas during a cold start. As a result, the rear cylinder may receive too much fuel, which can cause a brief smell of fuel during startup.
Overall, when routing the coolant lines on the Arctic Cat 650 V2, it is crucial to refer to the service manual, diagrams, or pictures to ensure correct installation. By understanding the connections on the carb and paying attention to details like the choke, you can ensure proper coolant line routing and maintain the optimal performance of your vehicle.
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Air in the fuel line
If you notice air in the fuel line of your Arctic Cat 650 V2, there are several steps you can take to address the issue and ensure proper fuel delivery to the engine.
Firstly, it is important to inspect the fuel lines and ensure they are properly connected. Incorrectly hooked-up fuel lines can cause air to enter the system, leading to engine performance issues. Refer to the diagrams or seek assistance from a qualified mechanic to ensure the fuel lines are correctly installed and secured.
In some cases, a faulty fuel pump may be the cause of air in the fuel line. If the fuel pump does not activate properly when the carb drains are opened, it may indicate a malfunction. A functioning fuel pump should restart pumping when the carb drains are opened, and fuel is drained from the float bowls. If the pump does not reactivate, it may need to be replaced.
Additionally, it is worth checking if your Arctic Cat 650 V2 is equipped with a fuel filter. A clogged or missing fuel filter can impact fuel flow and potentially introduce air into the system. Consider installing an inline fuel filter if your machine does not have one.
Another possible cause of air in the fuel line could be air leaks in the system. Inspect the fuel lines for any cracks or damage that could allow air to enter. If leaks are present, repair or replace the affected fuel lines to ensure a proper seal.
Finally, if the issue persists, it is recommended to consult a professional mechanic or seek support from an Arctic Cat authorised service centre. They can perform a thorough diagnosis and provide appropriate solutions to ensure your vehicle operates optimally.
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Carburettor cleaning
Carburettors are on almost all types of combustion engines. When an engine sits for a long time without being used, the fuel will start to break down. It is important to clean your carburettor to improve performance, better fuel efficiency, and increase engine life.
Before you start, ensure you have the right tools and materials. You will need a Phillips screwdriver, a flat screwdriver, needle-nose pliers, a wire brush, wrenches or a socket set, safety glasses, gloves, and a gallon of carb and parts cleaner. You may also need a gasket set or a carb rebuild kit.
Now, you can begin the process of cleaning your carburettor. First, turn off the fuel valve on the fuel tank and disconnect the hose. Remove the carburettor by loosening the clamps securing it to the manifold. Pay attention to any hoses, wires, or linkages, and once everything is detached, carefully remove the carburettor. Drain any excess fuel.
Next, take apart the carburettor, starting with the float at the bottom, then the jets. Unscrew the four screws on the bottom of the carburettor and remove the float bowl. Be careful not to tear the gasket if you are not replacing it. Remove the float pin with needle-nose pliers, followed by the float. Some carburettors will have a needle hanging on the float, which can now be removed.
Now, you can remove the jets. The main jet is short and fat and will have a hex head or a flat screwdriver head. The pilot jet is long and skinny and will require a flat-head screwdriver. Hold the jets up to the light to check for clogs. If they are clogged, set them aside for cleaning.
Before removing the mix screw, tighten it first and count the number of turns, so you know how much to turn it when reattaching. Remove the air screw and the idle screw with a flat-head screwdriver. These are located on the carburettor's sides; the idle screw is larger than the air screw.
Now, you can start cleaning the detached parts. Spray carburettor cleaner on the exterior surfaces and wipe away any grime or debris with a clean rag. Use a wire brush to clean individual parts. Soak heavily soiled or clogged components in carburettor cleaner for 20-30 minutes. Spray cleaner into the holes that the jets, air and idle screws, float needle, and choke came out of.
Finally, rinse and dry the carburettor thoroughly with clean water, then blow out all passages with compressed air. Reassemble the carburettor and reinstall it on the engine, adjusting as necessary. Remember to replace the fuel in your tank before starting the engine.
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Frequently asked questions
On the right-hand side of the carb, there are four different connections. Two are for the coolant lines, and the other two are for the fuel lines.
Refer to diagram #17 in the service manual for your model.
Yes, it is recommended to install an inline fuel filter.
If you can see air running through the fuel line, they are not hooked up correctly.
You can buy a fuel pump from a dealer or online.
