Bike India - - Bosch Techno Bible -

An en­gine breathes through the valves in the cylin­der-head, lo­cated at the top of each com­bus­tion cham­ber. The in­let valve is al­ways larger than the ex­haust valve, and two of each com­prise a four-valve head. More valves al­low an en­gine to breathe bet­ter and re­duce fric­tional losses. In a four-valve setup, the spark-plug is lo­cated op­ti­mally in the cen­tre of the com­bus­tion cham­ber.

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