air-intake-modification-13-003-80-2021-580

Service-Informatio&n r–~- Group 13 May 1980 Bulletin No..: ‘ Fuel Supply & Adjustment 13 003 ao(2021) I – For u. S. A. and Canada Only – Subject: Air Intake Modification for all 1980 Models Subsequent to the start of 1980 model production, it was discovered that a modification to the air filter housing top was beneficial to the air intake/carburetion systems. All 1980 models should be checked to ascertain if this modification was performed during manufacture. If not, it should be performed by the dealer. The modification consists of drilling four (4) holes in each air horn as indicated in the drawing below. l..r) J I _…:. – ·_,,;.._ …. — ‘1 ,.•, -·~,~1~, ~”)1~ii!ttl!.l::;I~!l~J;iJ_ D; : ,· “”‘~~>’ , ,,, .r–I·i at a 30° angle 5 mm from the edge I I -6 ——–~-~——–,- L ~ =J. L–2~_J apart Please route and initial before filing C:or.,iro Writor Technicians I n l – 2 – Bulletin No.: 13 003 80(2021) Motorcycles lacking this modification may experience a mid-range flat-spot in the carburetion as the restricted air intake creates an overly rich condition in the combustion chamber. Dealers performing this modification will be reimbursed 6 AW on submission of a completed warranty request form. BMW MOTORRAD GMBH After-Sales Service Munich (