KTM Thermostat installed on a YZ450 with pictures

TURBOXP09 · Nov 14, 2014

Hey guys,

I wanted to post some pictures of a thermostat install that will help with over fueling. The KTM thermostat part # is 81235013144.

Hope this helps if you guys are having any issues

pruner · Nov 14, 2014

Thanks for all the info

pruner · Nov 14, 2014

Just went to KTM parts direct and that part # don't work, any idea what bike it is from?

TURBOXP09 · Nov 14, 2014

I will be going to the dealership tomorrow that I bought mine from and see and let you know

c_ruf · Nov 15, 2014

Do you know what temperature these thermostats are set to open at? Any idea what the optimum temperature is for these motors? Does the Ktm kit include the thermostat and housing and hoses?
Thanks.

Gager · Nov 15, 2014

I did the same with my YZ; however, I used a Husaberg thermostat (looks identical, probably same part) that I picked up off email. Your install is really clean. I had to mount mine higher to make room for my Trail Tech temp sensor so I had to improvise a bit on the hoses. One thing is that I had to put a restriction in the bypass to reduce counter flow cooling. The "T" I used was a 1/2" x 3/8" x 1/2" pex fitting as I recall. I then found a 3/8" pex plug with a small hole drilled in it (1/8") for my restricter installed in the bypass line.

I believe the KTM/Husaberg thermostats are 70-75 degree celsius which is 158-167 F.

I would also look at the Thermo-Bob 3. The new housing is smaller and you have a selection of thermostats from 150-195. I'm starting with a 170 this season.

dirtrebel · Nov 17, 2014

Gager said:
I did the same with my YZ; however, I used a Husaberg thermostat (looks identical, probably same part) that I picked up off email. Your install is really clean. I had to mount mine higher to make room for my Trail Tech temp sensor so I had to improvise a bit on the hoses. One thing is that I had to put a restriction in the bypass to reduce counter flow cooling. The "T" I used was a 1/2" x 3/8" x 1/2" pex fitting as I recall. I then found a 3/8" pex plug with a small hole drilled in it (1/8") for my restricter installed in the bypass line.

I believe the KTM/Husaberg thermostats are 70-75 degree celsius which is 158-167 F.

I would also look at the Thermo-Bob 3. The new housing is smaller and you have a selection of thermostats from 150-195. I'm starting with a 170 this season.

can you elaborate on "counter flow cooling" How do you know its happening? I worry that too much coolant will continue to bypass the radiators on along pull, is that why the restrictor?

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KTM Thermostat installed on a YZ450 with pictures

TURBOXP09

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pruner

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pruner

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TURBOXP09

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c_ruf

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Gager

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dirtrebel

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