Motorcycle Repair: xs650, full tank, spark plugs

Question
My Xs650 has some problems,when i'm in the road sometimes dosent take the gas or better to say cuts the gas and sometimes makes like a gunshot ? Where the problem can be ?

P.S sorry for my bad English.

Answer
Bardh, Im not sure what to tell you without more info but here goes. Change the spark plugs and put in fresh ones to start with. If the backfiring condition continues the fuel may be restricted in the fuel passages in the carbs. Try running about a 1/2 bottle of "Lucas Fuel Injector Cleaner" through it with a full tank of gas. When the tank gets low put the other 1/2 bottle in and fill up and run it out again see if it help clean the carb out. If it doesnt then its time to pull the carbs and clean and adjust them.