2008 yz450f over heating

i race motocross and i i made a half a lap and the bike started to smoke and make a whisle noise when i got it back to the pit there was no more water left in the radiator. what make this happen (it was really muddy)

mud can cause the bike to overheat bad, was the mud blocking the radiator so no air could get in that could be a cuase. or you could have a bad cap.

there was no mud on the radiator at all plus i do have radiator gards on it (devols) but this is the first time this happened to it and i rode it in 96 degree weather while practicing. When this happened i refilled it and there is no leak at all

have you run it since? could be a bad cap.

no i have not ran it since it happened last sunday and i yet to look at it

how does your oil look? is it milky?

im not to shure yet but if it is what does that mean also do i nee to adjust the valves

it usually means the water seals are leaking causing water to get in the oil and that could be were it went, how many hours on the bike? i do my valves like every 15 hours that is probably too soon but that is what i like to do for peace of mind and its a pretty easy job.

the bike has only like 10 hours on it but i will check the oil in it were in pa r u im from pa

in the lancaster reading area, how about you, with only 10 hours on the bike there shouldnt be any kind of mechanical issue but you never know. i would start with the oil and then check the rad cap.

from the honesdale area by hurricane hills but ya i will check that out. So i guess i will be riding my 06 kx250 for a bit lol

pa r u im from pa
English please.:p

Do you have ten hours on your bike, and haven't changed the oil? Is that what I'm seeing here? :thumbsup:

Break in oil should never be run more than two hours, and the oil should changed every 3 ride days.

But to your question. It is possible that you may have started that ride with a low coolant level because you let the bike idle too long at some previous time and never checked the level. It could also be that you have a head gasket torque issue, or an internal coolant leak.

hurricane hills is a great track, i love that place problem is itsabout 3 hours wish is was closer. I will be up there sometime this year. you know if you only have 10 hours and havent had it that long check with the dealer they may do something for you.

no i canged it 2 times and the coolent was fine my sponsor works on my bike and everything was ok to ride

English please.:p

Do you have ten hours on your bike, and haven't changed the oil? Is that what I'm seeing here? :thumbsup:

Break in oil should never be run more than two hours, and the oil should changed every 3 ride days.

But to your question. It is possible that you may have started that ride with a low coolant level because you let the bike idle too long at some previous time and never checked the level. It could also be that you have a head gasket torque issue, or an internal coolant leak.

yes thats one thing i dont like bout these new bikes, my 08 450 will start spewing coolant out the overflow if i let it idle standing still for say about 2-3 minutes. i could let my old 01 model 250F idle all day and no problems...

Grey...unfortunately we live in a Text Messaging Shortcut world........soon to be considered New English....I pray not:foul:

Adam at only 10hrs either:

your cap is no good

or

there was not enough coolant in the radiator.

You can not let these bike idle more than a few minutes before the overflow will empty fluids out especially in 96 degree heat

There are options for better coolant fluids - search this

as well as higher temp caps

to be safe check the color of oil

and see if any fluid is weeping out of the weep hole at the water pump

and no you do not need to check the valves quite yet

ok thanks

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