RM-Z450 2008 rmz450

When starting my 2008 rmz 450, bike starts ok but then when I put the throttle on it starts to struggle revving up, if I keep the revs on it then starts to pop and backfire, any help please
 
When starting my 2008 rmz 450, bike starts ok but then when I put the throttle on it starts to struggle revving up, if I keep the revs on it then starts to pop and backfire, any help please
Sounds like a fuel problem. Could be many things. But I’d start with cleaning the carburetor and checking/setting the float.
 
Somehow I thought they didn’t start that till ‘10. In that case I know the injector can get dirty and may need cleaning from time to time. Motion pro makes a tool for this, if it doesn’t solve the problem it is still good maintenance. It wouldn’t hurt to check the spark plug boot either.
 
Apparently a lot of people think that but the efi first came out in 08, iv checked spark, fuel, timing, valve clearances, cleaned the injector but still having the same issue
 
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