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Dirt Bike Brands - Other
Need Help Diagnosing Blown Head Gasket?
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[QUOTE="mox69, post: 1222928, member: 76391"] Well first off 60psi is way to low , but I'm assuming you realized that. I would spend a bit more time checking the head. Get a good straight edge and check it over real well. If it comes out straight your good, but if it has warped even slightly I would toss it out. From what you've said either the head gasket failed on its own or the head somehow became warped and caused the gasket to fail. What type of coolant do you run? How often do you top it off / check the levels? Ever had the bike overheat before? While it would be a good idea to determine the cause of the failure sometimes thats not always possible. It would take a fairly large leak for the coolant to bypass the rings and pump down into the crankcase. In fact I'm not really sure that is possible, assuming the rings are sealing. More than likely you had a smaller leak that just boiled / vaporized as it made its way into the combustion chamber. My guess (emphasis on guess) for the piston deformation is that coolant was coming directly in contact with it at certain points. This was causing the piston to run through rapid heat up / cool down cycles. I would do a top end job (replacing the head if necessary) and giving the jug a very thorough inspection. While thats off check crankshaft end-play. If everything feels good on the bottom, bolt it back up and take off. The oil sloshing will depend on it's current temperature and how long it has been in use. It is pretty easy to tell if water has contaminated the oil, it will look like coffee with creamer. Once you get it back together, watch the cooling system very carefully. It wouldn't be a bad idea to inspect the water pump as well, make sure thats working 100% correctly. [/QUOTE]
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Dirt Bike Brands - Other
Need Help Diagnosing Blown Head Gasket?
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