{"id":5507,"date":"2018-05-02T16:51:53","date_gmt":"2018-05-02T16:51:53","guid":{"rendered":"http:\/\/gardentoolspares.com\/?post_type=product&#038;p=5507"},"modified":"2026-07-15T12:02:30","modified_gmt":"2026-07-15T12:02:30","slug":"139f-31cc-honda-gx31-umk431-strimmer-rocker-arm-kit","status":"publish","type":"product","link":"https:\/\/gardengeniusparts.com\/gtstest\/product\/139f-31cc-honda-gx31-umk431-strimmer-rocker-arm-kit\/","title":{"rendered":"139F 31CC HONDA GX31 UMK431 Strimmer Rocker Arm Kit"},"content":{"rendered":"<p class=\"font-claude-response-body break-words whitespace-normal\"><strong>Rocker arm kit<\/strong> fits <strong>139F 31cc<\/strong> engines, <strong>Honda GX31<\/strong> engines and <strong>UMK431<\/strong> strimmers\/trimmers\/brushcutters. The <strong>rocker arms<\/strong> pivot on the <strong>rocker shaft<\/strong> in the <strong>cylinder head<\/strong>, converting the lifting motion of the <strong>camshaft<\/strong> into direct downward pressure on the <strong>intake<\/strong> and <strong>exhaust valve stems<\/strong>, opening each valve at the correct point in the engine cycle. When a <strong>rocker arm<\/strong> becomes <strong>worn<\/strong>, its <strong>pivot bore loosens<\/strong>, or the <strong>contact surface pits<\/strong>, <strong>valve clearance<\/strong> changes and the valve may not open or close fully, leading to <strong>reduced compression<\/strong>, <strong>valve tapping noise<\/strong>, <strong>hard starting<\/strong>, or <strong>loss of power<\/strong>. Fitting a replacement <strong>rocker arm kit<\/strong> restores correct <strong>valve actuation<\/strong> and <strong>valve clearance<\/strong>, allowing the <strong>engine<\/strong> to run <strong>properly again.<\/strong><\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal\"><strong>Fits specified models:<\/strong><\/p>\n<ul class=\"[li_&amp;]:mb-0 [li_&amp;]:mt-1 [li_&amp;]:gap-1 [&amp;:not(:last-child)_ul]:pb-1 [&amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\">\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\">139F 31cc engines<\/li>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\">Honda GX31<\/li>\n<li class=\"font-claude-response-body whitespace-normal break-words pl-2\">Honda UMK431<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p><strong>Rocker arm kit<\/strong> fits <strong>139F 31cc<\/strong>, <strong>Honda GX31<\/strong> engines and <strong>UMK431 strimmers\/trimmers\/brushcutters,<\/strong><\/p>\n","protected":false},"featured_media":20219,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_cat":[98,87],"product_tag":[3059,5062,1236,1871,392,761,506,4555,941,342,245,1778,289,438,439,510,4550,583],"class_list":["post-5507","product","type-product","status-publish","has-post-thumbnail","hentry","product_cat-chinese-33cc","product_cat-strimmer-brush-cutter-parts","product_tag-139f","product_tag-31cc","product_tag-arm","product_tag-brushcutter","product_tag-engine","product_tag-exhaust","product_tag-gx31","product_tag-honda","product_tag-inlet","product_tag-intake","product_tag-kit","product_tag-rocker","product_tag-set","product_tag-strimmer","product_tag-trimmer","product_tag-umk431","product_tag-universal-parts","product_tag-valve"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>139F GX31 31CC 4 STROKE STRIMMER 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