Fuel Injection Bog

mech
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9
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2/19/2015
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Norman, OK US
mech
Edited Date/Time 3/9/2015 1:09pm
I have a 2014 yz450f that once I ride 3-4 laps it has a mid range bog. Just seems to sputter and pop. It seemed lean too so I checked for an air leak in the boot or where it connects to the throttle body but found nothing. Any suggestions on where to start?
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mxrose3
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8/17/2006
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Delmar, DE US
mxrose3 3/8/2015 8:31pm
3/8/2015 8:31pm
Get a GYTR tuner. It will read codes on the computer like a car if one of your sensors isn't working correctly.
I had a bad throttle position sensor on my '10, and the GYTR tuner diagnosed it for me.

Otherwise, check all your connectors on all the sensors.
How many hours are on it?
FGR01
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10/1/2006
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AZ US
Fantasy
999th
FGR01 3/9/2015 12:24pm
3/9/2015 12:24pm
Usual suspect is clogged fuel filter in the tank or the in line filter on the high pressure hose from the tank tot he injector (if Yamaha has one).
mxtech1
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Galesburg, IL US
mxtech1 3/9/2015 1:09pm
3/9/2015 1:09pm
clogged fuel filters is most likely.

second check would be to pull the injector off, apply low voltage to it and spray it out. May have some debris.

Off course, do this after you check all the basics. Electrical connections, spark plug boot and plug itself, bad fuel, clean air filter and nothing in the air path.

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