Answers to the most common questions about snowbike engine temperature, PST Engine Jackets, Cold Weather Panels, and the PST Heat Management System.
Snowbike Performance Questions
Why is my snowbike burning so much fuel?
On fuel-injected snowbikes, a common cause is an engine that's running too cold. Deep snow, cold air, and wind pull heat away from the engine faster than it can build it, so it never reaches or holds normal operating temperature. When the engine stays cold, the ECU stays in cold-engine mode and keeps enriching the fuel mixture, which burns noticeably more fuel. A PST Engine Jacket shields the engine from snow and cold air so it can reach and hold operating temperature, letting the fuel mixture return to normal.
Why can't my snowbike maintain operating temperature?
Dirt bike engines are designed to shed heat, which works against you in the snow. Powder packs around the engine and cylinder, and cold air and wind keep stripping heat away, especially at the slow speeds and high loads common in deep snow. A PST Engine Jacket covers the engine to block snow contact and cold airflow, and it rolls down into different positions so you can hold heat in extreme cold or release it on warmer days and packed trails.
Read more: Snowbike Engine Temperature: Why Engines Run Cold & How to Fix It
How do I know if my snowbike engine is running too cold?
Most riders notice high fuel use and sluggish performance first, but the only way to know for sure is to measure it. A temperature gauge shows your actual coolant temperature, so you can see whether the engine is reaching operating temperature and adjust your jacket to match conditions. Pairing a jacket with a thermostat and gauge gives you the most control.
Why does my carbureted snowbike run rough or stall in the cold?
Carburetors can ice up in cold weather, even when the air is dry. As air speeds up through the carburetor, its temperature drops, and even a small amount of moisture in the air can freeze inside the carb. That ice restricts airflow and fuel delivery, causing rough running, bogging, or stalling. A PST Carb Heater keeps the carburetor warm enough to prevent icing, so the engine runs consistently in cold conditions.
Read more: Snowbike Carb Icing: Causes, Symptoms & How to Prevent It
The PST Heat Management System
Do I need a thermostat on my snowbike?
Stock cooling systems are built for warm-weather riding, where the goal is to shed as much heat as possible. In the snow, that means coolant keeps flowing through the radiator even when the engine is cold. A Thermobob thermostat keeps coolant from circulating through the radiator until the engine reaches operating temperature, so it warms up faster and holds a steadier temperature.
Why do I need a temperature gauge on my snowbike?
Most dirt bikes don't have a coolant temperature gauge, so riders have no way of knowing whether the engine is running too cold or too hot. The Trail Tech TTO gauge we sell has a sensor that threads directly into the Thermobob thermostat, so it reads actual coolant temperature. Use it to know when to roll your jacket up or down, confirm your thermostat is working, and catch problems before they affect performance.
How do the Engine Jacket, thermostat, and temperature gauge work together?
Together they make up the PST Heat Management System. The Engine Jacket keeps snow and cold air off the engine. The Thermobob thermostat controls coolant flow so the engine warms up and holds temperature. The Trail Tech gauge shows you what's actually happening, so you can adjust the jacket as conditions change.
Product Questions
Is an engine jacket the same as an engine blanket?
Both describe an insulated cover that helps keep a snowbike engine warm. The difference is fit. Many engine blankets are universal, while each PST Engine Jacket is custom-designed for specific makes, models, and years to give secure coverage with proper clearance. PST jackets also roll down into different positions, so you can adjust coverage as conditions change.
What's the difference between the Engine Jacket and the Cold Weather Panel? Do I need both?
The Engine Jacket is the main piece. It covers the engine, keeps snow off, and rolls down into different positions so you can adjust coverage as conditions change. The Cold Weather Panel is an optional add-on for specific conditions. It covers the engine's top end on the right side of the bike, an area the jacket leaves more exposed. Snow and temperatures vary widely across the U.S. and Canada, so whether you need a panel depends on where and how you ride, but we recommend one for deep powder and cold conditions. It's an inexpensive way to add extra protection, and it rolls up to about the size of a cigar, so most riders carry it in their pack and put it on when needed. Panels aren't available for every model; if your jacket's part number has a matching panel, it will be listed with it.
Why isn't there a Cold Weather Panel for my bike?
Panels aren't available for every model. For the 2010–2013 Yamaha YZ450F, the panel coverage is built into the jacket itself, so no separate panel is needed. For a few other models, a panel isn't offered.
How do I adjust my jacket for different conditions?
PST Engine Jackets roll down into different positions to control how much of the engine is covered. On trails, packed snow, or warmer days, you don't need full protection, so roll the jacket down to let more heat escape. When you hit deep powder or colder conditions, roll it back up for full coverage and maximum heat retention.
How do I install my PST Engine Jacket and Cold Weather Panel?
Most installations need only sockets and Allen wrenches. Some models also require a drill and bit, usually just to drill a small hole in the plastic radiator louver, not the radiator itself. Tools vary by model. Every jacket and panel ships with an instruction sheet, and the installation steps are also printed on the back of each jacket and panel, so you'll always have them with you. For a visual walkthrough, watch our step-by-step installation video. If you still have questions, give us a call and we'll walk you through it.
