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97 xr250r bogging then back firing at high rpms

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Ok guy im stumped, 2 months ago i did my valves and my timing. Bike rode great no issues. I recently cleaned my air filter and noticed it did not have the filter spray on it so i put some on. Rode 5 days later and my bike was bogging then back firing at the high rpms. So i assumed it was the spray and washed my filter as best i could. Same issue. So got on here looked around got to the decision i needed to do a carb rebuild so did that. Same issue. Changed the cip on my jet tried every setting still same issue. I wanna say it sounds like my timing is off at the high rpms, but im confused how that would happen if i just changed the timing chain and everything lined up perfectly when i put everything back together. Any ideas? Or things i should try? 

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