Originally posted by CEOR We were out testing last weedend, when the the motor started rolling over. Pyrometered the motor, too late! Seems the (plastic)oil pump drive gear failed, melted, boiled the oil and took the entire motor out.
Top end took the worst of it. Cam, rockers, bearings.
Heat signatures on wrist pin, and piston.
So leads me to believe, gear needs to be replaced with either upgaded material, billet, or higher volume pump system with external ports as well.
Have my kids racing up here in the high desert of So. Cal were its been around 85-95 degrees for the past month.
Did you have a oil cooler that Xtreme offers on the bike when this happened?
We're in Texas. This one of the first things we did to our Daughter's bike. She's running the 140 big bore kit and FMF exhaust on her race bike. We noticed after practice last week , it seemed hotter than usual. It was in the Mid 80's here.
When our Daughter broke her crank, a couple of weeks ago, we started looking into other motors, too. The Lifan is supposed to be a good motor. She can work her Dad's manual clutch but we do not think she is ready for one just yet. Does anyone know if there is a version of the Lifan motor that comes with an auto clutch.
Two of our race bikes have a four row conventional style oil cooler.
The motor that "cooked", had the factory three row. We had just broke the motor in the week prior. Didnt have more than 12 total hours on it.
Dont really like the billet coolers out there. Just seems to be a heat sink.
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