2009 raptor 700 locking up

I hope it isn't crank related.

I don’t think it is well at least a hope not, runs fine for a short while then cuts out and locks up

This forum is full of good dudes. I'm sure more help is on the way. I'm just throwing ideas out.

Sounds like the piston/rings. If the motor is indeed actually locking up. I'd pull the spark plug and look for signs of aluminium contamination.

Engines either seize or they don't.
Check the rear wheel bearings/carrier.
I would also be checking the transmission.

Yes they can seize, cool and then run until they seize again, more than once. I've had a few engines come in the shop where people have done this. They get the engine so hot the oil will actually turn into something that looks like grease. Pull the drain plug and nothing comes out A bearing will seize then cool and loosen letting the engine run again. Have also seen rings pinch and after the engine cooled and rocked to free the piston/rings, run again. Heck I think 2 strokes were built to do it!

They can also hydro lock from fuel/coolant and seem seized and after the fluid has worked its way past the piston/rings run again.

Crank rod bearing is going out. Common problem. Happened to me twice on my turbo raptor. As it cools the bearing loosens up but with heat it expands and locks up. Eventually after many heat cycles she will lock up completely. Time for a rebuild on the motor. Probably not what I wanna hear but 99.9% that’s ur issue


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Pull the plug on the side of the case and try to spin the crank by hand while in neutral, with the spark plug out. This will tell you with 100% certainty if you have a serious issue


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raptordude said:

Pull the plug on the side of the case and try to spin the crank by hand while in neutral, with the spark plug out. This will tell you with 100% certainty if you have a serious issue


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What signs am I looking for while I turn it? Also do I turn it clockwise or counter clock wise ?

You’re checking if it spins freely without any tight spots. Spin clockwise. With the spark plug out the resistance should be constant (no spots where it’s easier to turn than others) you may feel slight resistances when the valves open, but it should be minimal


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Sounds like your crank could be going bad as others have mentioned. I've heard of stuff like that happening before. Definitely worth looking into.

I'd put money on rod bearing