The crankshaft and camshaft gears are often made from plastic - or you could just have one plastic, one steel or both steel. Anyway, no matter. The smaller gear fits to the crankshaft, and its keyed in place. The larger gear (twice the size, in fact) is keyed onto the camshaft. Identify the timing marks - they may be dots, dashes or vee type on both gear wheels. Its vital that these line up when you do the rebuild or the valve timing will be out. Enjoy!
John
October 2009
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