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Oil/engine temp question.

FRAC

Member
Joined
Jan 25, 2021
Messages
59
So I installed the Optimid computer upgrade on my bike. Best part so far is it shows you what gear you are in.

It has a settable oil temperature warning,. I have it set to 248 degrees Fahrenheit. I think that was the default. Yesterday my warning was going off (it was prob 85 degrees air temperature outside.). My question is what is considered a high temp for these bikes? Do I have something going on or is 248 degree warning point too low?
 

FRAC

Member
Joined
Jan 25, 2021
Messages
59
And apologies, I just realized someone posted almost the same thing a month ago. Still I don't think we got to the bottom of what the max temp should be set at.
 

op46

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Feb 2, 2021
Messages
168
Location
a ridge overlooking Lake Guntersville, AL.
I think the default is to low. There is a OPMID heat sensor program setting that is a algorithm that takes an average across the engine determined by actual measurement in the lab that is explained in the install instructions. I set mine to that and it has greatly reduced the alerts. I'm in Florida and don't have access to the instructions but will add to this post when I get back.
 

m in sc

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Feb 2, 2021
Messages
2,435
Location
Rockhill, SC
oil temp is read from the sensor on the side of the cylinder in the timing chain tunnel. when its hot.. running, lean bike to far left and then to far right. you'll see the oil temp display change on the readout fairly quick from it being more submerged (lean far to left) then to right. just as an fyi.
 

moshe_levy

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Joined
Jul 24, 2021
Messages
36
Location
NJ
I set my alarm on my Opmid to 299F. I also have this temp gauge, and I'm finding that it reads about 50-70F less than the Opmid once the bike is warmed up. The Opmid readout is worrying in the sense that conventional oil usually starts to break down at 275-300F and on hot summer rides, the Opmid is right in that range on my Trail using Honda GN4 oil.
 

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m in sc

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one reason I run a synthetic. not near as close to max temp as a conventional. (synthetic typically 375-400 degrees before it begins to get affected).
 

Bar None

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Joined
Sep 12, 2021
Messages
85
Location
WNC or SWFL
Here is the oil temp ( 175F) on my 2021 Ural CT sidecar after a ride and then the long climb up my steep driveway here in the mountains of WNC. I run I will check the oil temp on my new CT125 on the same run as soon as the rain stops in a week or so. BTW I checked the thermometer in boiling water and got 210F. I run Motul full syn oil in air cooled Ural. I have a feeling that the Opmid is incorrect like moshe_levy noted above or is it reading cylinder head temp?


20210830_125657.jpg
 

Dogsbody

Member
Joined
Mar 17, 2021
Messages
47
The Opmid is designed for an oil sender kit fitted to the sump plug. As it is it seems to be a head temp gauge, I take no notice of it And raised it to 140 deg C. Honda have never seen the need to fit one and you never hear of engines seizing unless they have no oil.
 

op46

Active member
Joined
Feb 2, 2021
Messages
168
Location
a ridge overlooking Lake Guntersville, AL.
Ran 250 miles earlier in the week for two days on twin 125s in North Alabama and a kiss over the Tennessee state line when Google maps lied to me about a road that showed connection with another below Huntland to get on county Rd. 65 to get back into state. Was dead end into pocket canyon that required a 20 mile diversion. The OPMIDs where heat alarming over 250 F when climbing some of the hills/mountains or cruising above 50 mph. It was in the 80's during the afternoon part of the rides. Never saw a temp over 270 F though. I changed the oil using Honda G4N last week at 100 miles and then put 200 miles on them this week. Went up and down state road 33 east of Skyline Al. with its 8-10 switch backs to get to the top or bottom and the bikes handled well except for the heat rise. Missed a gear going up gear instead of down shifting once or twice and the bike squats right there and then. Never did stall though. Speed dropped off considerably down into the upper 20s mph during the 90 degree turns on the mountains. All in all very pleased with overall performance as long as you stick to roads with speed-limits of 55 mph or lower. Otherwise you get cars and trucks running up your butt. Never did have anyone honk though for the few brief times we had to do that. Stopped in Scottsboro AL. by lake Guntersville on each day for lunch. Thats where UnClaimed Baggage store is if you never heard of it. CCP virus hurt its business due to no airlines flying but its coming back gangbusters. Got a nice LED flashlight for 10 bucks when we stopped in for a smoothie at their little snack bar. Also hit a little Mexican taqueria across the street from it and my buddy ordered some fish. He thought he was getting a fillet but he got a fish like the menu said.... LMAO.... but it was good. Pictures to be posted when I can get them off the camera...
 

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FRAC

Member
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Jan 25, 2021
Messages
59
Now that Summer is returning, do we have any sort of concesus what the oil temp warning should be set to on the Opmid? Thinking 250 to start with after reading Op46 post above.
 

AZ7000'

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Jan 28, 2021
Messages
957
Ignorance is bliss, I just ride it and enjoy. I would guess approximately ZERO cases of a stock CT-125 overheating and blowing the motor if it had oil in it, any oil.
 

m in sc

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Feb 2, 2021
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2,435
Location
Rockhill, SC
yeah i wouldn't worry about it either. it gets to be an issue when you start modifying the motor... a lot. and you cant on this due to lack of an aftermarket ecm. even running a 170 4v motor on my grom, the oil temp never got out of control once. even at 10500 rpm for long periods of time. I had an oil temp monitor on that, and had it set to 325 but that was on synthetics. never even came close, 220-235 ish was normal on a hot day and that motor made over 3.5X what the trail does.
 
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SneakyDingo

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Aug 6, 2021
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1,560
On the stock motor, just look at those Scooter Cannonball guys for the C125's. Yah, it's tuned differently, but there aren't enough differences for us to say it should matter too much. Those guys were running their engines flat out, every day, all day, in all kinds of conditions. If there was ever a time where this engine would have carked it, it would have been on that. Those kinds of rides tend to highlight.... uh... thought processes in engineering and limitations thereof. Like the BMW final drives are fine, but they're maybe a little less fine when run flat out repeatedly for days on end during IBR rallies.
 

Donkeythekidd

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Joined
Feb 10, 2022
Messages
19
I have the opmid. It was around 75 degrees outside, my temperature hit 320. I took a 30 minute ride, pretty flat roads, full throttle hitting 60mpg through half the ride. So now I have it set above that.
 

m in sc

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this is why i dont trust the opmid. lean the bike to the left and get actual oil on it and it will drop down a bunch in temp. been there done it. Best sensor location would be the drain plug but thats not where it ties in.
 

dmonkey

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🇺🇸
That doesn't sound like any fault of OPMID's, but instead of the OEM oil temp sensor location.
 

m in sc

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Feb 2, 2021
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2,435
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Rockhill, SC
it is. however, you would think they would put it in a better location. they can also space out the data collection interval in the gauge further so its smoother, they come up with higher spikes due to this.. Like said, i had one, did the same thing.
 
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