AS3 Performance high-pressure radiator caps are a must - have for serious racers. They stop coolant loss from radiators when the motor runs at high temperatures, ensuring your bike keeps going and helps you cross the finish line. High - temperature motor operation can damage the engine, so these caps are crucial. This cap fits 2021 Rieju MR 300 Racing and Pro models without any modifications. It can withstand more pressure than standard caps, preventing coolant overflow in high - heat situations. With a polished aluminium finish and AS3 Performance branding, it looks great too. It's from a UK company and comes with a 12 - month warranty. The cap you see in the picture is exactly what you'll get.
Using this radiator cap is easy. Just remove the old cap from your 2021 Rieju MR 300 radiator and replace it with this AS3 Performance high - pressure cap. Make sure it's firmly in place. When your bike's motor is running, especially at high temperatures, this cap will prevent coolant from overflowing. But remember, the longer the motor runs hot, the more potential harm it can do to the engine. So try to avoid long - term high - temperature operation. For maintenance, regularly check the cap for any signs of damage or wear. If you notice any issues, contact the UK company that offers a 12 - month warranty. And you'll get the exact cap as shown in the picture.
