2006 Arctic Cat Y-6/Y-12 50cc and 90cc Service Manual, Page 48Get this manual

2006 Arctic Cat Y-6/Y-12 50cc and 90cc Service Manual, Page 48

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23Extend the timing chain through the cylinder; then install the cylinder onto the piston and crankcase assemblyMake certain the dowel pins seat into the cylinder base
25Install the two alignment pins and the cylinder head gasket onto cylinderPull the chain out through the gasket and cylinder head making sure the alignment pins seat properly into the cylinder head