Alloha,

Few weeks ago I ordered the KOSO CHT sensor (scooter-attack: KO-KI000R14 ). I thought it would be K-type thermocouple... Unfortunately, it seems (looking at the wire colour and international standards) that it is J-type ( So I can't use it.

Couple of question:

* Do you a know a place to buy K-type thermocouple CHT sensor ?

* I found K-type thermocouple :D, but they are aimed to be put under M6 or M8 screw: Question is: Do you think it could be almost the same to put this sensor under a bolt of one of the spigot of my Malossi head instead of under the sparkplug ?

Thanks !

KTy -

i have very good expiriences using somting like this (KTy 81-121 ):

i placed it in a 5mm bore hole in the head.

Thanks for the reference... funny one: KTY 80-110 :)

But it is limited to 150°C and error is quite large in the upper range...

I will stick to K-type mostly because I have a MAX675 for a K-type thermocouple interface, so it's convinient.

But as for my second question, do you think temperature inertia will be very different between under the sparkplug and under a bolt of one of the 4 spigots ?

probably the inertia is even less under the spigots. you could also just screw it with an other smaller bolt on the rear side of the head.

in my case 150°C is enough and if the error is systematic due the unlinearity than i dont care if it is 120 or 125°C.

@kty:

you do know there is a ring type sensor by koso to be fitted under the spark plug, don't you?

@kty:

you do know there is a ring type sensor by koso to be fitted under the spark plug, don't you?

Yeah, I bought it ! Read the first post :)

But unfortunatly, it's a J-type thermocouple... That was my problem.