overheating, i need better coolant? maybe a fan?

hey guys on my 06 yz 450 it the real tight stuff where im not moving very fast it starts to overheat and just dumps out my fuild.. im running engine ice but i heard theres better stuff out there like evans coolant thats good up to 400 degrees? whats engine ice good up too?

so whats the best coolant you can run, also im thining about putting in a wr overflow tank on my bike to catch it all can i do that?

also has anybody ever put a fan on theses bike like the KTM has?

try using the search, you will find lots of topics about coolents.

if evenas runing so much hotter the bike will run realy hot.

i use engine ice and its seems to work great.

the fan is somthing im realy intresting in, beacuse if i dont keep speed up it will boil.

u can try diffrent rad cap.

check your jetting,make sure it isnt lean

Id be weary to run something that wont boil over until it is that hot. If your already boiling over with engine ice, I would consider jerry-rigging some sort of fan on there, or maybe change your gearing. Allowing your bike to run hotter than it already is, is a mistake IMO.

I like to ride really tight stuff and would occassionally boil my 07 wr450.

I installed a Boyesen impeller and pump cover. Haven't boiled over since :p

I like to ride really tight stuff and would occassionally boil my 07 wr450.

I installed a Boyesen impeller and pump cover. Haven't boiled over since :p

well the reason i think i boil over faster than everybody else is that i got a lot of work done to my motor that would cause for more heat..

im going to look into the boyesen impeller and pump cover and maybe get a high pressure cap to see..

also when i meant really slow riding i mean 1st gear moving 3 mph tight stuff.. it wasent even a trail so i dont really expect to be going that slow again..

thanks guys

Another option is to fit an overflow tank into your cooling circuit. Motion Pro make one that fits on the fork leg behind the front number plate. Another option is to fit the overflow tank from a WR. I have used both, the WR tank on my 400 and the Motion Pro tank on my CR250.

The tank allows for your radiator to blow off and when it cools again, to draw the coolant back in.

At very slow speeds the YZ will always boil over, the best solution is to minimise riding at slow speeds, and to catch the coolant it expels (as explained above).

Another option is to fit an overflow tank into your cooling circuit. Motion Pro make one that fits on the fork leg behind the front number plate. Another option is to fit the overflow tank from a WR. I have used both, the WR tank on my 400 and the Motion Pro tank on my CR250.

The tank allows for your radiator to blow off and when it cools again, to draw the coolant back in.

At very slow speeds the YZ will always boil over, the best solution is to minimise riding at slow speeds, and to catch the coolant it expels (as explained above).

thanks im gunna look into getting the wr tank..

should i get one from a 07 and up since they had a alum frame ?

Another option is to fit an overflow tank into your cooling circuit. Motion Pro make one that fits on the fork leg behind the front number plate. Another option is to fit the overflow tank from a WR. I have used both, the WR tank on my 400 and the Motion Pro tank on my CR250.

The tank allows for your radiator to blow off and when it cools again, to draw the coolant back in.

At very slow speeds the YZ will always boil over, the best solution is to minimise riding at slow speeds, and to catch the coolant it expels (as explained above).

I found this option for the over flow tank the other nite while doing some internet surfing---

https://ssl.perfora.net/www.advancedperformanceaccessories.com/sess/utn;jsessionid=15498f48cc5c254/shopdata/index.shopscript

APA coolant catch tank works well - it's what i run on my YZ. if the coolant does boil over - it just goes into the catch tank, then as it cools off it siphons back into the radiators.

Also, here's a 12 volt fan that pulls about 25 watts. you would need the "puller" style if you mounted it behind the radiator

http://www.spalusa.com/store/main.aspx?p=itemdetail&item=30103009

For your type of riding....tight stuff/woods

Use what the HareScramble /Enduro guys use

Evans Coolant - same stuff ZipTy sells

Boysen water pump/impeller kit

You should try Water Wetter. It made by Redline . Factory team Honda was using it for the 1st couple of years in the crf250r's in the nationals. They were trying a lot of different things to keep the bikes cool cause they were so high compression , very aggressive cam, and aggressive ignition timing. I was told its better then Engine Ice. I think it will freeze up though in the winter so it has to be drained out. :banghead:

You should try Water Wetter.
It's a good product, and if you notice, Wiz includes that in his recipe. It's very important when using straight water, but less so when using coolants mixed with water, since that kind of does some of the same things.

Water Wetter is a surfactant. That is, it eliminates the surface tension that water has, and that breaks down the slight thermal barrier that forms between the water in the cooling system and the metals involved to let heat flow into and out of the water better.

To see this work, take a glass of water and an ordinary straight pin. You can actually float the pin on its side on top of the water if you drop it in place carefully. Now stir in just a little bit of laundry detergent and try it again. That's what water wetter does, and you can try the same test with a mix of coolant and water. Most of the time, you'll see that the pin won't float. You can also see this by putting plain water onto a metal surface. It will bead and puddle up. With Water Wetter, it won't. The treated water will sheet out more like an oil, but so will a coolant/water mix.

It doesn't hurt to use it anyway, so you can if it makes you more comfortable, but it isn't really very necessary when using mixed coolants.

As far as which coolant is better, that depends on what your goal is. If you want to avoid losses due to boiling, The Evans stuff is best, followed by a 50/50 mix of PG or EG coolant under a high pressure cap. But neither of those will actually cool the engine as well as plain distilled water with Water Wetter added. OTOH, treated water will still boil at about 235 with a standard cap, and a 50/50 will stay liquid 'til around 270, so you have a choice. I recommend splitting the difference the way Wiz has by reducing the coolant in the mix to 20-30%.

nice write up gray, Sorry wiz636 I didnt even look at the thread you posted.

I did 75% distilled water,25% low tox antifreeze and water wetter.Small boil over (into catch bottle) in real tight slow single trackThis past week end. I think I will add another oz of water wetter and see.Gray,is it poss to run a small fan on a 07 yz with out messing with the stock electrical system?

...is it poss to run a small fan on a 07 yz with out messing with the stock electrical system?
Only by running it from a battery.

a lot of good info in this thread for almost any 450 owner that rides off-road. whatever make they may have. :banghead:

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now