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Ryan.Amoils Ryan.Amoils
9/19/2017 6:10 AM

Anyone know what is causing this and what needs to be fixed. On KTM 250 SX-F?

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Acidreamer Acidreamer
9/19/2017 8:10 AM

2 things or a combination of both.

The gasket neees replaced.
You didnt put any or enough yamabond or similar on the lobes of the gasket.

I usually put a generous amount of yamabond on when i do my kx. If i dont it always leaks even with a fresh gasket.

2009 Kawasaki KX450F
2009 Kawasaki KX250F
2002 Suzuki GSXR 600

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shaunbruce827 shaunbruce827
9/19/2017 10:31 AM

My 2016 Husqvarna FC250 did this as well. It's common for the gasket to start leaking after having it on and off multiple times, or just old age. When I put in a new piston at 92 hours, I also installed a new valve cover gasket. Do not use any sort of sealant on the gasket, it will likely flake off and end up inside of your engine.

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Acidreamer Acidreamer
9/19/2017 11:20 AM
shaunbruce827 wrote:

My 2016 Husqvarna FC250 ...more

Every service manual says to put silicone sealant on the lobes.

2009 Kawasaki KX450F
2009 Kawasaki KX250F
2002 Suzuki GSXR 600

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ktm-5 ktm-5
9/19/2017 5:30 PM

I too had this same issue on our 16 250sxf pretty much right from it being new, I put a light layer of hondabond on it and no more leak. Just make sure u don't use too much to where it will get in the motor. Also I only put it on the side of the lobes not around the whole thing

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