I've always run a motorrad with the relief valve in mine. Works great
Reviews of MotoRad radiator cap
9 votes
Every. Damned. Radiator. Cap. I can find for sale is a motorad. I've gotten two now that came in different brand boxes, neither will hold much pressure or draw in coolant when the engine cools off. I'm seriously doubting how much longer I can deal with every new part being fucking garbage.
I had a Motorad radiator cap until about a week ago. Worked fine just changed it for a spiffy Flex a Lite cap.
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