2016 YZ450F Coolant leak/Bad water pump?

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3/26/2020 6:19 PM

Hey everyone,

I started my 450 the other day and let it idle for a few minutes as it was a bit cold out and it hasn't been going in a while. After a minute or two I noticed what looked to be coolant on the stand. Oil didn't look milky in the sight glass and the bike idled fine. Anyone know what could cause this?


3/26/2020 7:06 PM

Bad water pump seal.

Paw Paw


3/27/2020 1:03 AM

What Paw Paw said. There will be a bleed hole under the water pump. If the coolant is leaking out the hole, the water pump seal (and possibly the shaft bearing) is bad.


Many thanks to everyone helping me out this GNCC season: SRT Offroad, Acerbis, FCR Suspension, O'Neal Racing, Evans Waterless Coolants, Rekluse, Twin Air, Braking Brakes, Carbsport

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