Posts: 2
Joined: 6/12/2018
Location: Johnsonville, NY USA
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?
Posts: 5514
Joined: 1/31/2018
Location: Mansfield, OH USA
Id check your valve lash and if that checks out, look into shorts in the electrical system after it gets hot.
Posts: 3395
Joined: 4/3/2013
Location: Benton, LA USA
Posts: 24
Joined: 4/28/2018
Location: Phoenix, AZ USA
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”
Posts: 6930
Joined: 9/18/2007
Location: York, SC USA
Edited Date/Time:
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.
