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post #1 of 9 (permalink) Old 06-14-2012, 08:34 AM Thread Starter
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oil temp light keeps coming on

Ok so i have a 1992 honda fourtrax 300, when i first turn it on the oil temp light stays off for about ten minutes but after that it cuts on and will flicker on and off, sometimes the light just stays on. so what causes an oil temp light to cut on in the first place? and how do i fix it?
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post #2 of 9 (permalink) Old 06-14-2012, 09:43 PM
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It's not overheating, is it? If not, you probably have a bad alarm unit or a bad oil temp sensor.

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 9 (permalink) Old 06-14-2012, 09:45 PM
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It's not overheating, is it? If not, you probably have a bad alarm unit or a bad oil temp sensor.
x2 ^^^..agreed..bad oil temp sending sensor ?..or bad alarm unit ?. orrrrrrrrr..a loose or bad wire connection ?. try removing the switch connector..and see if it needs cleaning ? or loose ?.

'89 trx350D foreman 4x4...'85 vf700c magna, '03 trx450fm foreman 4x4 , 2015 Yamaha waverunner fx cruiser ho, '05 trx500fm
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post #4 of 9 (permalink) Old 06-14-2012, 09:47 PM
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in case your wondering where the switch is ?..right lower hand side..behind the metal plate..forward switch..( it sit's towards the front behind and under the cover )..they get mud and crap on them..or loose ?..and tend to not work right.

'89 trx350D foreman 4x4...'85 vf700c magna, '03 trx450fm foreman 4x4 , 2015 Yamaha waverunner fx cruiser ho, '05 trx500fm
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post #5 of 9 (permalink) Old 06-15-2012, 09:46 AM Thread Starter
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i took the little cover off of the sensor and there is a little fray not broken the coating is just torn and wires are a little exposed,should i just use electrical tape? How would i tell if its actually over heating?
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post #6 of 9 (permalink) Old 06-15-2012, 10:37 AM
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i took the little cover off of the sensor and there is a little fray not broken the coating is just torn and wires are a little exposed,should i just use electrical tape? How would i tell if its actually over heating?
if it over heats..by all rights..the alarm unit should shut the bike down ?..that is..if the alarm unit is working ?!..lol. tape the wires up..if they touch the engine or that metal bracket cover..that grounds the lead out..whichhhhhhh..will make the light on the dash come on !. you can test this for yourself..unplug it from the switch..turn the key on..when you touch the end of it to the motor ( clean spot ! )..lol...watch the oil temp light..it will come on when you do this..if it does ?..then either your temp sensor is bad ?..or..the bad spot in the wire was touching the engine or that metal bracket ?. they work by grounding out..when that sensor goes bad..it's just like if you were to just take the wire..and touch it to the engine.

'89 trx350D foreman 4x4...'85 vf700c magna, '03 trx450fm foreman 4x4 , 2015 Yamaha waverunner fx cruiser ho, '05 trx500fm
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post #7 of 9 (permalink) Old 06-15-2012, 10:05 PM
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if it over heats..by all rights..the alarm unit should shut the bike down ?
I don't know if it will or not. The only time I've ever seen a Fourtrax 300 overheat, the oil temp light came on, but it kept running.

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 #8 of 9 (permalink) Old 06-15-2012, 11:12 PM
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if it over heats..by all rights..the alarm unit should shut the bike down ?
I don't know if it will or not. The only time I've ever seen a Fourtrax 300 overheat, the oil temp light came on, but it kept running.
i think your right..i have never over heated a trx300 though !..lol.

'89 trx350D foreman 4x4...'85 vf700c magna, '03 trx450fm foreman 4x4 , 2015 Yamaha waverunner fx cruiser ho, '05 trx500fm
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post #9 of 9 (permalink) Old 06-15-2012, 11:43 PM
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if it over heats..by all rights..the alarm unit should shut the bike down ?
I don't know if it will or not. The only time I've ever seen a Fourtrax 300 overheat, the oil temp light came on, but it kept running.
i think your right..i have never over heated a trx300 though !..lol.
I've never overheated one either, but I saw some guys that had one hooked to a plow, using it to turn a field. After a while, it would get hot and the oil temp light would come on, but it would keep running. They would shut it off and let it cool down for a few minutes and then plow some more.

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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