This topic contains 22 replies, has 0 voices, and was last updated by 
-
I am of the thinking that the SX models are really designed to be on a mX track. 4 laps and back to the pits to cool down before the next race. The EXC is meant for longer slower riding. I am thinking that KTM have all the extra stuff like a thermostat etc. there for a reason.
Hey Scoot,
Best leave your thermostat in but you probably need to check it opens at the right temp and is not sticking or is rooted. As i am talking from a race engine builders experience the problem with removing the thermostat is that when you are just cruising down the road or trail is that the engine runs way too cool where as with the thermostat installed it regulates the temperature of the engine to run in it’s correct operating range. An SX doesn’t have a thermostat as it usually operates at wide open throttle a high percentage of the time so regulating the temperature with a thermostat is not necessary. I have a KTM450EXC and the best investment that i have made with this is to install a factory thermo-fan.
Hope this helps.Cheers,
LeftyHi Murph,
I have Radiator Guards, Bullet Proof Designs of couse, :cheer: and have absolutely no problems.
Everyone should buy a set! :laugh: :laugh: :laugh:
Cheers,
Leftymicknmeld wrote:I am of the thinking that the SX models are really designed to be on a mX track. 4 laps and back to the pits to cool down before the next race. The EXC is meant for longer slower riding. I am thinking that KTM have all the extra stuff like a thermostat etc. there for a reason.on that subject mine boiled for the first time since I did the jetting yesterday, so I may have to look at a fan fitout,
Lefty do the BPD’s ones cater for a thermo fan, I heard that with the Force onces you need to make some mods.
I wonder if 2012 ones come with a thermo fan.
Chris.
the thermo switch in my 640 had died between my trading it and getting her back.
i used a mount on thermo switch from Jaycar/Altronics. they had 60,70? 80 and 90ยบ variants for around $10-15ea from memory. it works as it should.
so if you go to fit a fan and don’t have the bung to fit the proper KTM style screw in ones.
you can use the same as i did.
and a tip for mounting switches and the like. most auto electrical stuff switch the earth/ground, meaning the power to the fan is on as long as the key is on and they turn the ground on and off.
i sent one up to Micknmeld with a bracket and fan for his BRP….. but can’ta been any good :whistle:
:laugh:chris72a wrote:micknmeld wrote:I am of the thinking that the SX models are really designed to be on a mX track. 4 laps and back to the pits to cool down before the next race. The EXC is meant for longer slower riding. I am thinking that KTM have all the extra stuff like a thermostat etc. there for a reason.on that subject mine boiled for the first time since I did the jetting yesterday, so I may have to look at a fan fitout,
Lefty do the BPD’s ones cater for a thermo fan, I heard that with the Force onces you need to make some mods.
I wonder if 2012 ones come with a thermo fan.
Chris.
Hey Chris,
Yes BPD does cater for a thermo fan kit.
Cheers,
Leftypete the wulf wrote:I’ve seen guys run a small bottle in the air box as an overflow tank and they say it works.
I’m not sure about it.
I have also heard that adjusting your needle ( not sure up or down ) to suit summer or winter.
Someone may be able to explain that better.PTW
The overflow bottle is only for recovery of coolant once the engine cools down. It wont stop the engine from overheating. Once the engine overheats and the coolant pressure overcomes the cap pressure, as the coolant expands, it will then be either dumped out the overflow (onto the ground) or into the coolant recovery reservior. When the engine cools a vacuum is created in the cooling system allowing coolant to be drawn back into the engine, provided the coolant is being drawn from the bottom of the recovery reservior and no air enters the system. It is the same system used on cars, trucks etc.
As an engine builder I would not recommend using a product that increases the boiling point of the coolant above 120deg C.
Hope this helps.
Cheers,
Lefty
Lefty wrote:pete the wulf wrote:I’ve seen guys run a small bottle in the air box as an overflow tank and they say it works.
I’m not sure about it.
I have also heard that adjusting your needle ( not sure up or down ) to suit summer or winter.
Someone may be able to explain that better.PTW
The overflow bottle is only for recovery of coolant once the engine cools down. It wont stop the engine from overheating. Once the engine overheats and the coolant pressure overcomes the cap pressure, as the coolant expands, it will then be either dumped out the overflow (onto the ground) or into the coolant recovery reservior. When the engine cools a vacuum is created in the cooling system allowing coolant to be drawn back into the engine, provided the coolant is being drawn from the bottom of the recovery reservior and no air enters the system. It is the same system used on cars, trucks etc.
As an engine builder I would not recommend using a product that increases the boiling point of the coolant above 120deg C.
Hope this helps.
Cheers,
Lefty
Good explanation Lefty I learnt somethin’ this morning.
You must be logged in to reply to this topic.