Maintenance & Technical > Kx Frankensteins
KX 500 Engine in Ninja 500
Foxx4Beaver:
--- Quote from: taddpole77 on January 23, 2019, 01:17:51 AM ---I am dealing with a head gasket leak right now. It is a bit of a mystery why it's leaking.
--- End quote ---
Have you lapped the head and cylinder to be sure both surfaces are completely flat?...that's "usually" the cause of a leaky head gasket.
taddpole77:
Twice now by my machinist. In the service manual it has a supplement on which orientation to put the head gasket but the gasket they show in the manual doesn't look like my gasket. It was a stock kx gasket torqued to 18 ft pounds criss-cross pattern. I have never had a head gasket leak before. Going to try a cometic gasket in it next. As far as I can tell the cylinder and the head are not cracked. It was leaking out of the head stud. New studs were installed because the old ones where rusty because the head was leaking.
dave916:
Were the head stud nuts tight when you took off the head?U might need retorque after running
No harm to countersink the barrel alittle when fitting new studs
Did u use proper spec/grade studs when replacing? {ie not 8.8}
I Use a little thread tape to the top of the studs now when i fit head gaskets
Foxx4Beaver:
Not sure how many guys on here do this...but I like to seal the studs in the cylinder with a little Yamabond. As studs have been known to back out sometimes.
As stated, countersinking the stud holes a touch is a good idea too.
taddpole77:
I used new oem studs. I checked the torque on the head before I pulled it and they were all still tight and at spec. I put loctite on the studs when I installed them and they were all tight when I pulled them to take to the machinist. I didn't look like the coolant was coming from inside the hole where the stud was. I am pretty sure the loctite would have stopped it anyway. I am pretty sure the head just wasn't sealing and it allowed the coolant to work its way to the stud. I don't think it was leaking into the bore though. Hopefully it won't leak again.
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