Starboard motor over heating at idle

ok, update. I have alpha one drives. Here are pics of the thermostat housing and the risers. The water intake is definitely coming from the outdrives. Here are pics. It’s overheating only at idle, as soon as I give it throttle it cools right down. The risers are too hot to touch on the starboard motor once it hits operating temperature. But the port side is very cool, so I know it’s not sucking enough water to cool it off. Hopefully there is just a plug or something easy, but probably not not with my luck.
 

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Yep, you're gonna have to crack the case open on that Alpha drive and change that impeller.
 
When you take the outdrive apart pull the water pump housing out and under that is two sections separated by a partition which corrodes so that there is no more separtion between the two. One part is water intake and the other is water/exhaust out so that when the partition corrodes off you will be sucking partial exhaust/ hot water back thru the motor. Happened on one of my alpha 1 gen two drives. I just rebuild it with JB weld for aluminium and all is find now.
 
Update, o had a hose kinked in the outdrive, preventing the water to flow. The impeller was fine. Geez what a headache just over a bent over hose.
 

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