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E81 in Trike , overheating.

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Have a rebuilt E81 motor in a Trike, replaced head gaskets but stil over heating, Rear mounted radiator. Has thermo fan fitted. Can any one please help?

Edited by Rich79

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Is very hard to remove all air in rear rad setup try a rad cap fitting off upper heater hose so you can fill engine before startup you will have a air pocket traped between rad and lower rad hose conection and will most likely be very hard to fill. My rear rad cooling sestem hold 20 L of coolant the more coolant the more cooling medium at any rate make shure no air in engine or could damage it

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