Oil Temp Sensor - Honda ATV Forum
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post #1 of 7 (permalink) Old 03-26-2012, 05:49 PM Thread Starter
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Oil Temp Sensor

I need a Oil Temp Sensor for my 2001 Foreman 400...can I buy one online? Having trouble finding one.

Thanks,
Brian
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post #2 of 7 (permalink) Old 03-26-2012, 11:05 PM
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Welcome to the forums. Yes, you can order one online. Click on the link below and the oil temp sensor is #7 in the schematic. It's Honda part # 37750-HC4-751.

2001 Honda TRX400 FOREMAN 4X4 OEM Crankcase Parts | MotoSport

Most 4-wheeler problems are caused by a loose nut connecting the handlebars and the seat!!

You only need two tools in life -- WD-40 and duct tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.
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post #3 of 7 (permalink) Old 03-27-2012, 04:45 AM Thread Starter
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Sensor

I guess it pays to know where to look...Thank You
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post #4 of 7 (permalink) Old 03-27-2012, 12:32 PM Thread Starter
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Another Question

I guess before I spend 50 plus bucks I should at least ask if I'm on the right track. First off we're dealing with a 2001 Foreman 400 4X4 that I just picked up. I've run the engine enough that I feel pretty certain that the cooling fan should have come on. I checked all the wiring and connections and everything seems okay. I then removed the wire from the oil sensor and ground it to the engine, the fan run fine and the oil light also came on. Is it a safe bet that replacing the sensor will fix the issue or is there something else I'm missing? How hot do these things have to get before the fan runs?

Thanks Again,
Brian
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post #5 of 7 (permalink) Old 03-27-2012, 11:48 PM
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The engine has to reach approximately 300 degrees F. before the fan will come on. If the engine is, in fact, reaching this temperature, then I would say your oil temp sensor is bad. You usually have to run them pretty hard to reach that temperature, though. Or running slowly in low gear for a while will usually make the fan kick on, too.

In the service manual, there's a procedure shown for testing the oil temp sensor. It involves submerging the oil temp sensor in oil and heating the oil to a couple different temperatures and then using an ohmmeter to measure resistance across the sensor terminal and the body of the sensor. I will find the procedure and post it for you.

Most 4-wheeler problems are caused by a loose nut connecting the handlebars and the seat!!

You only need two tools in life -- WD-40 and duct tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.
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post #6 of 7 (permalink) Old 03-27-2012, 11:53 PM
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Click the image to open in full size.
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Most 4-wheeler problems are caused by a loose nut connecting the handlebars and the seat!!

You only need two tools in life -- WD-40 and duct tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.
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post #7 of 7 (permalink) Old 05-04-2017, 06:11 AM
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You may want to simply unplug the wires right where they plug into the sensor and plug them back into themselves.(male and female connections) It should run the cooling fan as long as the key is turned on. Also it will cause the red LED light to indicate an overheat situation. At least that's the way it works with my 1987 Foreman with a 350D. (quick access with only two bolts to remove) Now, it might also be that your 2001 won't run if there is some kind of a built in shut off designed to recognize that direct connection as an overheat situation. Good luck, it's a quick temp fix while waiting on parts!

An ounce of prevention is worth a pound of cure.
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