the corresponding screw boss 27 see fig4 by making the first and second heat shield plates 23 a and 23 b the single component 25 in this way the first and second heat shield plates 23 a and 23 b can be attached to the v type engine e with a small number of bolts 28 further a holding part 34 is integrally formed to the single component 25 i e in the illustrated example one of the heat shield plates 29 b the holding part 34 holds linear members 33 such as an electric wire for control of the v type engine e an operation cable and a hose referring back to fig1 an opening exhaust port 31 is provided to a head part of each of the first and second banks b 1 and b 2 the exhaust ports 31 are provided at the back faces of the respective banks b 1 and b 2 which are opposite to the faces where the intake pipes 16 a and 16 b are provided the first and second heat shield plates 23 a and 23 b made of synthetic resin are attached to the side faces of the first and second banks b 1 and b 2 which face the carburetor 14 each of the first and second heat shield plates 23 a and 23 b covers the corresponding side face and defines a corresponding one of the cooling air passages 22 and 22 between the heat shield plate and the side face the end parts of the first and second heat shield plates 23 a and 23 b at.