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Buell, XR1200X and Sportster injector cleaning
How often you should do this:
You only know when you do a flow test and see after the test what the condition is. It should be a normal maintenance interval with every 10.000 KM. depending on how often and how many miles you make and where you live (USA and Brazil have lot's of ethanol in there gas) But every bike older then 2-3 years i really recommand to do this every 2 years to be sure the right amount of fuel is going in the cylinder head and the injectors are not glocked. If there is a defect in the injector you find it,
and if there is a big flow difference you find it. besides that the cleaning is a must read the article.