2005 brute force 750 problems

[rockstar crf250r]

i have a 2005 brute force 750 carb it has some custom exhaust on it and belt snorkel and just tires and rims and clutch kit..... it is back firing and sputtter and dosent have power to turn tires barley not the spark plugs carbsclean what caan it be please help

 

[STYKO]

Maybe it's in limp mode? Check belt limit switch. At least rule it out....


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[Mikehunt]

I would check the carb boot for tears in them, check the valve and make sure they are not too tight and check the jetting to make sure it isn't to lean. Does it run better with the choke on?

 

[KVF 700]

It is in limp mode. Do a google search to find the method to get it out of limp mode. It is relatively easy.