MOPED ARMY

I was just surprised by the pictures & I completely missed what you said, but yea I would of been more carful about takening it apart. Yea ur right I can't read

You can't be more careful.

I did all the tricks to get it apart, heat, time, solvents. Nothing did jack shit. So I got a lil apey. That glue is crazy.

The tto is designed to be destroyed if you try to open it at the seam.

Period

Still almost whichever you use it's linear response (except true thermistors) but you don't need a temp gauge to read exact temps, only "too hot", and "how close to too hot".

Like 400 degree head temps is an arbitrary number. the engines not at 400, it's not seizing because the pistons at 420 F. 400 is just the reading we get from heat soaked through to the spark plug and measured by the sensor we all use, so it's consistent between our shared experiences.

but again there's nothing magic about the number 400. or whatever it is you chose to stay under.

as long as your sensor is consistent and you know that whatever number your sensor reads when a tto would read 400, you're just as well off...

yea I mean like thermocouple weld - if you were going to make a thermocouple you just need the two wires of the right alloy and you zap em together and they'll read a correct temp, but if you soldered em then your alloying's all off, and the connection between the two isn't gonna be legit, you def wouldn't get a valid microvoltage signal

but if it was just the wires downstream or upstream, not the contact point between the two metals, solder should work fine, maybe tiny offset from resistance differences but totally negligible. but I think trailtechs and RTD where its got a tny lil resistance wire or something and so as long as your solder's effectively zero resistance it wont care

https://www.doscycles.com/collections/all-items/products/dos-digital-20-572-f-temperature-gauge

Y’all sleeping on DOS. They have one for $40 with a replaceable battery and another one with with hours and RPMs for $60.

https://www.doscycles.com/collections/all-items/products/dos-digital-tuner-special

But I am definitely all for cutting up the ones I have and trying to reuse them.

Maybe it's defective.

Pull the thermo guyee out of the HF meat thermometer and pot it into a 14mm copper ring connector. Boom

That is because you cant wire a thermocouple to a trail tech, it was stated earlier the trail-tech uses a thermistor. It's just a resistor. It changes resistance with temperature and the display of the trail tech is simply measuring the ohms and converting it to a displayed temp in C of F.

There are basically two types of thermistors:

NTC = resistance goes up when temp goes down (vice versa)

PTC = resistance goes up when temp goes up (vice versa)

A thermocouple actually produces it's own temperature dependent voltage, so you would need a display that can read this type of sensor. Totally different than the thermistor.

Most thermistors are rated at X amount of ohms at room temp. So a "10k sensor" is 10,000 ohms @ 70F. You can use a multimeter to measure the resistance of the trail tech sensor and then cross that over to some other sensor that might be interchangeable. It is probably a common type of thermistor and Trail tech just has that copper ring put on so it can be mounted to a spark plug.

eh, it's only because I worked as a technician for a company that made all sorts of temp sensors, so I learned way more than I wanted to.

I also hate the "disposable" trail techs design so I am all for finding ways of modifying them or extending their life. Maybe if they were 5 bucks, but 40 dollars for a throw away device is dumb!

BBBBBB bump!

After bitching about a dead Trail Tech temp sensor to Jbot he reminded me of this and I finally did it myself. Maybe more people haven't done it because they dont realize how simple this really is. You solder in the 2 wires and its done.

Buy this at Harbor Freight, its less than $6.

On the right side there is a little relief to slip a screwdriver in and pop open the case.

Clip those wires, pull out the probe, and solder in the connector from your old, dead, piece of shit, non replaceable battery, son of a bitch trail tech.

It was reading erratic with a resistor cap and regular plug, so I tried a resistor plug with a non-resistor cap, and it works great. Odd little detail but thats what works.

That's really it. Its that simple. (edited)

I ran thicker wires out of the bottom center then cable tie it to a wire bundle or cable housing.

So the thing is shock mounted! Hell yuuuuuuhhhh

Yeah you need to seperate the power supply for this from your bikes power supply for electrical reasons.

You can make an isolation circuit or just use a battery (battery is easy)

Maybe I'll get one of these if I ever finish my hydro Minarelli build

Nah it's not RF it's the lack of a clean reference

Anyone else use the Hardline TH-1 digital thermometer w replaceable battery? (edited)

I mean, you could easily use an isolated DC/DC converter. You'd need to drop down from 6V or 12V (assuming you already rectify and regulate) to probably 3.3V anyway.

Isolate the thing that’s already isolated

It’s your only hope