Coolant catch can kit

Easy DIY coolant catch can kit for use with the snowbike heat exchanger system

An overflow catch can is the probably the best bang for the buck mod you can do to your bike. As coolant heats up, it expands creating pressure within the system. The excess pressure is bled out through the overflow nipple / tube onto the ground. As the system cools and coolant contracts creating a vacuum, the vacuum valve is opened allowing air to get sucked in. This air sits at the top near the cap, until you tip over or roll your bike and then the air bubble is free to go into the system and create an insulating air pocket that can cause some serious engine damage. Put the end of the overflow tube into coolant, and the vacuum will draw in coolant instead of air. 

This simple coolant catch can catches expanding coolant from the overflow hose, and allows coolant to be sucked back into the system instead of air as it cools. 

Assembly instruction: Drill a hole in the cap so its a slightly snug fit around the 1/4 overflow tube (you want to allow air to pass), make sure the tube is long enough to reach the bottom, Zip tie it in place of the other radiator, fill 1/4 – 1/2 with coolant and done! You don’t need to use any hose clamps on this, lightly hand tighten the cap.