Radiator Help

For some reason, my brothers Drz is not holding antifreeze. Its eventually making it's way to the over flow over time. It randomly started doing this about a week or so ago. We are confused to what could be causing it. He just rebulit it over winter with an Athena 440 kit. The bike is a 04 with about 20,000 miles on it.

Anyone got any ideas to what could be causing this?

Worn or damaged coolant cap, leaking head gasket, wrong Head Tq.....

Worn or damaged coolant cap, leaking head gasket, wrong Head Tq.....

Have to take a look. Wouldnt there be antifreeze in the oil if the head gasket is leaking?

Wouldnt there be antifreeze in the oil if the head gasket is leaking?

NO, many times a head gasket will leak only under high combustion pressures....just enough to push coolant.. But not leaking so bad as to allow cross contamination to oil... I usually still find trace amounts of oil in coolant though, as the coolant and some oil from the cylinder makes its way to the tank.

What did you torque the head bolts to?

What compression piston did you use?

Which base gasket did you use (single or three layer?)

What cams are you running?

NO, many times a head gasket will leak only under high combustion pressures....just enough to push coolant.. But not leaking so bad as to allow cross contamination to oil... I usually still find trace amounts of oil in coolant though, as the coolant and some oil from the cylinder makes its way to the tank.

What did you torque the head bolts to?

What compression piston did you use?

Which base gasket did you use (single or three layer?)

What cams are you running?

Put on a different rad cap. All bolts are torqued correctly. Stock cams. 3 layer gasket. And stock compression for the apex 440 kit. Not sure exactly but it's not an Athena -.- ill be checking it tomorrow morning before i leave for school.

With all this known it would almost have to be the head gasket then correct?

New rad cap did nothing. Overflow is even fuller then before. :(

You said "All bolts are torqued correctly"

What did you TQ the head bolts ?

What did you TQ the cylinder nuts to ?

What kind of base gasket, paper or steel?

​Was the head gasket a steel, black coated, three layer type?

By chance was there brand markings on the gasket packaging?

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