What is the most powerful sled john deer came out with

[vader]

I have a 440 liquid fire. Wondering what was that the most powerful engine they built? And is there a cooling system upgrade for the 1982 liquidfires.

[Matt]

Probably yours - '82+ Liquifire with the HSR ignition. The Liquidator is up there too. Cooling isn't really a problem on Liquifires, so if you are overheating while riding in the right conditions, there is probably something else wrong.

[Danzig]

why do you need an upgrade or even ask ?

[JDT]

Ok. I'll bite.

The 75 JD 800???

[80spitfire]

I'd say the Dator takes first place for power.

-Brian

[vader]

I put invader heads on my machine so it's running hot. Jdx 8 is that not a air cooled 440

[vader]

Dator ???

[ljm]

I put invader heads on my machine so it's running hot. Jdx 8 is that not a air cooled 440

Why would Invader heads make it run hot?

[AirborneX4Special]

You must have something else wrong.

[ihengineer76]

Dator ???

A 1976 Liquidator. Deere's race sled for that year.
Invader heads shouldn't make the sled run hot. It does raise the compression, but only by a little. This should have no effect on temp. I would check :
1. Thermostat- Make sure it is opening before 150 degrees F.
2. Radiator- Make sure the cooling fins are not all bent over or abstucted, and the passages inside are not plugged with deposits
3. Hoses- Make sure you don't have a collapsed lower radiator hose
You said before on another thread that it was running hot at 150 degrees. This is in the normal operating range. If you lose idle RPM when it is fully warm, you may be running too rich and loading it up. The idle should be set at about 3000 RPM. Have you done a plug check to see if they are all sooted up? Correct mix will give them a medium brown color. Too much fuel and they will be sooted up.

[nick80lf]

If my memory is correct the thermostats on the Kawasaki powered Liquifire's open at 108F.

[vader]

Invader heads did raise the compression. Now I am running 92 octane could that be my problem. Rad gets warm and heat exchanger gets warm. I will check my thermostats. Spark plugs were brown. Could it be water pump, how would I check?. Thank you

[vader]

Hang on I am confused. Thermostats open at 108 degrees. So should the normal operating temp of the engine be around 115 to 120 degrees. Overheat at 150 to 160 degrees.

[ljm]

I wouldn't consider it overheated until 190 degrees plus .

Depends what type of riding you are doing. If you are traveling slow on a hard packed trail 150 plus would be normal.

Both the rad and the heat exchanger should be warm to the touch.

[vader]

Thanks that clears lots up. So with that info you gave me I'm going to say I do not have a cooling issue. So it's got to be a fuel issue. I will put new plugs in and try again. Now if it is fuel where do I start. Do I change the idle setting. Because the machine runs fine threw the rest of the power curve.