6 - CARBURETTOR Pre 1982- Jawa machines are with off set carburettors ( fitted on the right side) Post 1982 Jawa introduced the so called central carbs frames ( carburettor straight behind the engines) Today all carbs are 34 mm. In the past Jawa used 34 mm; 35 mm; 36 mm and even 38 mm carbs (sometimes with restrictors) on their engines. All carburettors must correspond to FIM regulations. Adjustment and jetting is made for methanol fuel. The air filter is upright on the model shown and is cleanable. It also comes with a protective dust cover over the filter, which allows for the filter to breathe cleaner.