Bigfoot0518

yz450f overflow problem

15 posts in this topic

I put a new top end on my 04 yz450f and it wont stop leaking out the overflow. I tried a new radiator cap (didnt work) checked the oil for water no water. The only think i can figure is i didn't toque the head right and compressed gas is getting in the cooling passages.what do yins think?

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After having run the engine and the system cools off and you open the radiator cap, what is the level? Is it still slightly above the core or not?

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Is the new radiator cap the same temperature cap as the old cap?

 

And what temperature cap are you running?

 

Did you use new head / cylinder gaskets?

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First off are you using at least 50/50 to prevent boil over or more antifreeze.

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Yeah even tried engine ice

Yeah even tried engine ice

 

And did you flush out all the water mixture per the engine ice instructions ?  

 

Have you bleed the radiators for air?

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Air purges itself, so it's a non-issue.  If the system is filled at the radiator, that's all you need to worry about as relates to that.

 

My question is, how did you torque the the head?

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Time for new head gasket and a torque wrench. Hopefully the head wasn't warped by whatever tightening method you used the first time.

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