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sik_m8

2011 yz450f problem

26 posts in this topic

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hey guys i just brought a brand new 2011 yz450f. i havent had a problem with it until today. i was keen to go for a ride so i made sure i had fuel checked my oil and my radiator fluid and all was good. i started my bike to let it warm up then went and put my helmet on and came back 2 mins later and there was radiator fluid, steam and smoke coming out of the radiator overflow. i turned off my bike straight away let it cool down and checked the radiator and it was dry as a bone. what can cause this 2 happen? this is a brand new bike with only 2 hours and 29 minutes on it

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Idling to long would be my answer!

That was my initial thought too! They don't like to stand still....

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+1. A new tight engine and idling too long = boil over. Fill 'er back up with coolant and ride it!

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Reminds me of the first time I had a car with air conditioning. Came home. Turned car off. Came back hours later to drive it. There's a giant pool of fluid under my engine!!! ***?! Say what? Oh, that's normal?

And it's normal if the Yamaha or most any other liquid cooled bike is left running while not moving to spew its guts.

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thats a joke..id be pissed after paying $$$$ for a new bikeand it breaking

Nah, it's not broken. Just overheated.

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thats a joke..id be pissed after paying $$$$ for a new bikeand it breaking

It's not broke!:smirk: Leave any modern liquid cooled MX bike running too long while sitting still and it will boil over.

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It's not broke!:smirk: Leave any modern liquid cooled MX bike running too long while sitting still and it will boil over.

especially when they are new!

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with no fan to pull air through the rads how is the engine supposed to transfer heat? 2 minutes idle will bring the bike to a very high temp. being new will only make the problem worse

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alright so it was ideling for to long. how long can the engine run without radiator fluid before it starts cooking. my bike has always had a load knock in it aswell and its louder now. going to take it back to yamaha monday morning just to be safe

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Two minutes is way too long.

A rule that applies to so many things in life....:smirk:

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I had a 2010 now the 2011 yz450f, and live in the heat of tropical North Queensland, I idle for periods over 2 minutes regularly and don't boil over a drop. Our local track 30 second board guy is about 3 minutes too nad nothing lol.

So I would be looking deeper mate than just idle too long...

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I had a 2010 now the 2011 yz450f, and live in the heat of tropical North Queensland, I idle for periods over 2 minutes regularly and don't boil over a drop. Our local track 30 second board guy is about 3 minutes too nad nothing lol.

So I would be looking deeper mate than just idle too long...

really mate? i live in cairns... i took it back to yamaha and the mechanic said the only thing they can think of is that the radiator cap wasnt on properly which i recon is bullshit

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my 08 did the same thing when left idling...didnt lose all the fluid but half , and it was left for only 2-3 min as well ...No Big Deal

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