Why am I overheating?

[Nutbar]

Hello, all! So, my Castle stock Spartan is overheating after about five minutes. It's the motor specifically. I have a dual pickup rudder, aluminum water jacket, and an x640. I run 6s on two 3s 8400mah 40c lipos. I place my lipos all the way forward. I rarely run WoT, but average around 60-80% throttle. I know for sure that water is flowing well thru both lines. I grease my shaft and lube my motor and strut every other run.

1. Should I be overheating with this setup, or do I have a bad motor?

2. Does WoT run cooler than slower speeds? Doesn't more speed = more amps = more heat, but also more water flow, which means LESS heat, so it just kind of cancels out?

3. Would the stock prop (or an x442) fix the overheating?

4. On a separate note, which SPECIFIC rubber grommet are people using between the transom and the strut? I tried the Traxxas Blast grommet TRA3840, but it does not fit well.

Thx in advance for all responses!

[Fluid]

You have several problems.

1. No FE boat should overheat. But running for 5 minutes does build up a lot of heat on a marginal setup. Either limit your run time or prop down. If the motor got too hot too often it may be damaged now.
2. Running WOT all the time is easier on your equipment. A lot of accelerating means running full-throttle but not full-speed, this pulls a lot more amps than a constant WOT. Part throttle can be hard on the ESC.
3. The prop you are running is putting too much load on the motor for the way you are running.
4. ???



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