2009 crf450r cuts when hot

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6/20/2018 11:10 AM

Got a 2009 crf450r for a steal, ran hard now it seems to cut out when it gets hot. Fire it up, it idles and warms up fine, take off and it screams. A few minutes in it starts to cut out. I put new air, fuel and oil filters in it. I just put a new spark plug in it and the old one looked like it had ran rich. Anyone else had that problem or have any ideas?


6/20/2018 12:17 PM

Id check your valve lash and if that checks out, look into shorts in the electrical system after it gets hot.


6/20/2018 2:22 PM

Do an ohms test on the coil.
Also check carb vent lines for dirt.

Paw Paw


6/25/2018 8:07 AM

what do you mean by taking off and it screams?

with a smoked clutch, the bike will run and idle fine but when you take off, and torque the clutch, it will slip and rev out really fast. that’s what i think when you say “screams”


6/25/2018 9:11 AM
Edited Date/Time: 6/25/2018 9:12 AM

Please describe how you warm it up.

Some off your description sounds like a leaking head gasket so do a cooling system pressure test or a coolant sniffer test.


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