See http://www.ttr250.com/Rebuilding_cylinder_head/TTR_cylinder_head_rebuild.htm
Exeter, Devon, UKhttp://www.ttr250.com - The one and only dedicated TTR250 FAQ!
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i always shot blast them... leave them in the head so the seats and valve faces don't get blasted.... blast the combustion chamber & down the ports..just a very quick flick over with old used blasting medium.. is almost a fine powder...
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