Coolant temps on 2017 450 XC with Thermobob

[smokeyburnout]

Looking for info on the coolant temps on my snowbike set-up and what others have experienced. I have a 2017 KTM 450 XC with a Thermobob and Trailtech Voyager gauge connected to the temp probe. The gauge is reading 236 F temps (it was climbing so I shut it off) and not sure if the gauge is reading wrong or because of the location of the temp probe on the Thermobob is so close to the coolant out of the head. I used an infrared temp gun to verify temps coming out of the head to the Thermobob housing and they were high indicating the gauge was reading correct. After the radiators on the coolant back into the engine, the temp had dropped pretty good indicating that coolant is flowing. This was in the shop after a quick test ride and not out on the trail so I'm not sure if the high temps is because of no air flow through the radiators.....

So the big question is: what is normal coolant temps out of the engine into the Thermobob housing? Will temps read high all the time on the coolant immediately flowing out the engine?

thanks in advance for any info.

 

[medicman]

I have a 2016 ktm 450 Xcf and the thermobob and my temps run between 170 -210. Runs 170-180 mostly and if pulling a long hill then goes up 190-210. Make sure it's burped and might have to pull the thermostat check for something interfering with the opening and boil it to make it opens at the right temp.

 

[yooper01]

Looking for info on the coolant temps on my snowbike set-up and what others have experienced. I have a 2017 KTM 450 XC with a Thermobob and Trailtech Voyager gauge connected to the temp probe. The gauge is reading 236 F temps (it was climbing so I shut it off) and not sure if the gauge is reading wrong or because of the location of the temp probe on the Thermobob is so close to the coolant out of the head. I used an infrared temp gun to verify temps coming out of the head to the Thermobob housing and they were high indicating the gauge was reading correct. After the radiators on the coolant back into the engine, the temp had dropped pretty good indicating that coolant is flowing. This was in the shop after a quick test ride and not out on the trail so I'm not sure if the high temps is because of no air flow through the radiators.....

So the big question is: what is normal coolant temps out of the engine into the Thermobob housing? Will temps read high all the time on the coolant immediately flowing out the engine?

thanks in advance for any info.

I have a 570 rfs motor with OEM exc thermostat and a high flow water pump.

Riding in warm weather with heavy snow, my bike stays between 190 and 210 with no radiator covers or shrouding. This is when I'm working the bike hard in the trees. The high flow water pump does wonders for the rfs, and worked wonders for my xc4 530 motor last year.

Have you looked into a high flow pump for your bike?

Sent from my XT1650 using Tapatalk

 

[kell8071]

I have a 2016 ktm 450 Xcf and the thermobob and my temps run between 170 -210. Runs 170-180 mostly and if pulling a long hill then goes up 190-210. Make sure it's burped and might have to pull the thermostat check for something interfering with the opening and boil it to make it opens at the right temp.

Do you have any engine blankets, radiator block offs, etc? I am running all of that and still struggle to stay above 130 in powder with a thermobob.

Kell

 

[CATSLEDMAN1]

temps

2013 ktmxcw 500 I have engine covers both sides, sliding radiator covers, stock thermostat and now thermobob.

cold days riding in the powder 130 to 160, headed down packed trail 175.

Now we have had some rained on wet cement new DENSE powder, off with all the covers, long climbs to the high country, 240 degrees, stop and pack engine with snow, drops to 125 quickly, then off climbing, and we try to stop and pack snow when it hits 220.

Slow tree riding in the slop and 40 degree air temps, 215 for couple of hours.

If I had to ride more wet cement, I would for sure install a heat exchanger. We usually get a couple weeks of this in the spring, then later spring riding, corn snow not so hard to pull and the temps will run 190.

 

[ItDoAble]

I had to put a shutoff valve on the TB bypass hose for those warm days. 2014 450 sxf.

 

[needpowder]

I had to put a shutoff valve on the TB bypass hose for those warm days. 2014 450 sxf.

Wait, what? If I'm thinking about this correctly then, you have no coolant flowing at all until the thermostat opens and then more goes through the engine (cooling it better) because none is going to the bypass?

 

[ItDoAble]

Wait, what? If I'm thinking about this correctly then, you have no coolant flowing at all until the thermostat opens and then more goes through the engine (cooling it better) because none is going to the bypass?

More goes thru the radiator. Bypass routes some of the coolant straight from the engine back into the engine. No cooling there. By shutting off the bypass it work just like a stock thermostat system would.