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Trying to fix a srx pops at full throtel not sure what to cheak next carbs are clean and power valves are clean but not sure if they are opening what next help

Need help my nytro has 1000 km on it now and won't hold 8300 rpm when you punch it it hits 8350 then falls off to 7600 will not rev out it is the fx 121 short track and has a hindel muffler on it everthing else is stack need some info please

Is anyone haven trouble with there nytros mine has 1000kms on it now and still wont rev out over 8000rpm under a load it stays about 7800 to 7900 will hit 8300 when you punch it then falls off not to sure what to try

I am trying to fix a friends sled not to sure where or what to check now cabs are clean we took the power valves out cleaned them and still the engine is poping through the carbs at full throtel we have checked the valve motor and it seem to work at low speeds but not at full rpms would it be...