Oil operating temperature
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Bike Model = : GT125'10
Hello everyone,
I’m new here. Proud (not first)owner of a a 125 Comet 2010. I’m planning on upgrading the oil cooler(got a 250 radiator) and at the same time, installing a cooling fan on the rear side of it. Currently the engine runs with fresh Motul 5100 10w50, I’ll probably get a better spec oil(71007300v etc) after 1 or 2 oil changes.
What’s the engine oil operating temperature? I”ve come across info about other bike engines that suggest around 60ºC but also others go almost 90ºC, but no data about Hyosung 125/250cc engines. Any insight will be welcome.
Thank you in advance,
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about 50c on a fast 70mph road on a summer day but hovers at 90c in rush hour traffic or less 80c but limit should be about 100c before its cooking itself, this confirms data on the EFi service manual on engine temp sensor ranges (only 250 EFi gets it and is for the ECU only, so you wont see it on the dash)
A fan might be overkill , as you want the radiator to not have objects on it to pass air through the back of the rear engine so it gets some air , however since you’re on a naked bike , it should get more than enough air will ever need and a 250 cooler to help it. A fan might be extra tax on the electrics (albeit a tiny tax)
There is no hard data on the 125cc/250cc from Hyosung but generally air-oil cooled engines will hover around 50c at 70mph road , assuming the sensor is in the cylinder head, anything over 100 isn’t good long term
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Good to know, my idea for the oil temp is to monitor it on the radiator outlet(i.eg. T fitting with a 65 degree thermoswitch fitted there). For the cylinder head temperature… I guess best sensor location is rear cylinder but where? Spark plug is hidden too deep, thats usually the hottest point you can get,.. Any suggestions?
Thank you in advance,
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You can read the oil line banjo of the rear cylinder, gives a good enough indicator of the temps if trying to compare with the front. The rear cylinder doesn’t allow much room under the frame.
Or do a custom job to bore the cylinder itself near its internal oil gallery and tap a sensor to it like what Hyosung does to the front cylinder on EFi machines, so you have to be careful here unless you have a spare cylinder to experiment on.
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