2009 crf450r cuts when hot

chuckymccabe
Posts
4
Joined
6/12/2018
Location
Johnsonville, NY US
6/20/2018 11:10am
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?
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kb228
Posts
6161
Joined
1/31/2018
Location
Mansfield, OH US
6/20/2018 12:17pm
Id check your valve lash and if that checks out, look into shorts in the electrical system after it gets hot.
Paw Paw 271
Posts
3640
Joined
4/3/2013
Location
Benton, LA US
6/20/2018 2:22pm
Do an ohms test on the coil.
Also check carb vent lines for dirt.

Paw Paw
SWMX
Posts
85
Joined
4/28/2018
Location
Murrieta, CA US
6/25/2018 8:07am
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”
lumpy790
Posts
9145
Joined
9/18/2007
Location
York, SC US
6/25/2018 9:11am Edited Date/Time 6/25/2018 9:12am
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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