Posts
8
Joined
5/9/2016
Location
Saint Clair, MI
US
Brad0199
5/10/2016 7:14am
5/10/2016 7:14am
Edited Date/Time
5/13/2016 6:55pm
2015 YZ450F 1/2 throttle Back fire [ LOUD ] on acceleration. 1 Ft flames out exhaust, every once in awhile small/light pop out intake. Engine sounds dull like timing or fuel mixture is off. Has 50 psi fuel pressure, cleaned fuel injector and checked spray pattern. Ohm tested fuel injector, ignition coil, spark plug cap, coolant temp sensor, air temp sensor Installed new spark plug, different coil and boot,new fuel, Tested TPS using 5 volt sweep test. Dielectric grease all electric connections. Checked timing and valves all are right on. I do not have a tuner This bike has 13 hours on it. not hard hours. Any help will be greatly appreciated. Thank you.
The Shop
There is also an outside chance that the starter plunger is leaking air or the TPS o-ring is leaking. Have you attempted to spray carb cleaner around the engine while running to see if the idle speed changes. That may help identify the air leak area.
Have you cleaned the injector?
Paw Paw
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