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On my 2008 rmz 450, at 1/4 throttle there's this horrible studder. It started about a month ago. The bike has about 70 hours on it i bought it later last year and never had a problem with it. The only thing that i changed on it was the header pipe it had the stock one and i tweaked it where it was making a weird noise so i replaced it with a stock one.

Things i have tried............................

New spark plug

Cleaned the air filter 

Oil change 

Checked the valves one exhaust is on the loose side but not out of spec.

I may try injector cleaner but idk if thats ok for these bikes.

Any help is appreciated thanks in advance 

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Check out the TPS. I had mine move on me after a weird crash that gave me similar symptoms. I loosened the screw and readjusted and had no issues after. 

There is also a tach sensor by the stator that can go bad which will give similar issues. Having said that I have never personally seen an issue with one. Only ever seen it online. 

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