Motorcycle Engine Base Pipe Seal Serow Tricker 2008-2024 Fit For Yamaha XT250 2013-2024 Serow 250 2008-2017 XG250 Tricker 2010-2017 motorcycle cylinder head base pipe gasket kits direct assembly mounting , fits cylinder joint positions , no or needed dual sealing , stabilizes cylinder compression , cuts escape at pipe joints density compression sheets , integrated hot pressing craft , smooth flat contact surfaces OEM matched outline hole layout , consistent thickness to seal engine assembly gaps tightly