{"id":84146,"date":"2007-02-19T19:44:13","date_gmt":"2007-02-19T10:44:13","guid":{"rendered":"https:\/\/www.decoboco.info\/en\/?p=84146"},"modified":"2026-09-24T13:41:08","modified_gmt":"2026-09-24T04:41:08","slug":"inside-the-oil-cooled-engine-head","status":"publish","type":"post","link":"https:\/\/www.decoboco.info\/en\/20070219\/everyday-events\/inside-the-oil-cooled-engine-head","title":{"rendered":"Inside the oil-cooled engine head"},"content":{"rendered":"<p>&nbsp;<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.decoboco.info\/wp-content\/uploads\/imp\/674393_46328480_0.jpg\" \/><br \/>&nbsp;<\/p>\n<p>&nbsp;<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.decoboco.info\/wp-content\/uploads\/imp\/674393_46328480_1.jpg\" \/><br \/>&nbsp;<\/p>\n<p>&nbsp;<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.decoboco.info\/wp-content\/uploads\/imp\/674393_46328480_2.jpg\" \/><br \/>&nbsp;<\/p>\n<p>&nbsp;<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.decoboco.info\/wp-content\/uploads\/imp\/674393_46328480_3.jpg\" \/><br \/>&nbsp;<br \/>We ran a maintenance campaign and got to see the condition of all kinds of oil-cooled heads.<br \/>\nCam scuffing concerns \u2605 loud valve noise \u2605 never checked before so want to confirm \u2605 and all sorts of other opinions<br \/>\ncome in.<br \/>\nAbout cam scuffing&#8230; the degree of scuffing varies quite a bit, and with proper oil management and stable oil pressure and temperature, we think you can overcome it quite a lot.<br \/>\nHowever, if your oil temperature just keeps climbing and climbing, try shutting off the engine at traffic lights.<br \/>\nYou can suppress the oil temperature quite a bit just by doing that. Even at short lights, oil temperature rises two to five degrees, but while it does rise,<br \/>\nthe reality is you can&#8217;t ride with enough wind to bring it back down. If you can&#8217;t lower it, then not raising it in the first place will make the engine<br \/>\nmuch happier \u2605<br \/>\nAbout oil pressure&#8230; the pump is driven by the back gear of the primary reduction (clutch housing).<br \/>\nAbout hydraulic pressure&#8230; the pump is driven by the reduction gear on the back of the primary reduction (clutch housing).<br \/>\nit becomes an easy-to-scuff situation.<br \/>\nAbout engine oil \u2605<br \/>\nI haven&#8217;t used really bad oil so I can&#8217;t say for sure, but I don&#8217;t think the brand alone determines whether you get scuffing or not.<br \/>\nSome people using OEM oil don&#8217;t have scuffing, and some people using expensive ester non-poly oil do scuff,<br \/>\nso while mileage matters, oil that&#8217;s been used pretty harshly (heated repeatedly) should probably be changed regardless of mileage \u266a<br \/>\nCam scuffing doesn&#8217;t mean you just swap the cam !!<br \/>\nYou have to replace the rocker arms at the same time, so on a 2-1 setup that&#8217;s 8 pieces, and on a 1-1 setup you need 16 rocker arms<br \/>\nso throw in a Yoshimura and change the rocker arms too and you&#8217;re quickly over 100,000 yen! (just in parts)<br \/>\nWhether things are running rough or not, I think it&#8217;s definitely an essential item to check \u2605<br \/>\nAn oil-cooled bike with the valves perfectly adjusted, the carburetors synchronized, and the engine damper replaced really runs beautifully.<br \/>\nIt wears a little bit with every kilometer you ride, so it&#8217;s surprisingly easy for the owner not to notice the accumulated degradation \u266a<br \/>\nCan&#8217;t wait for the GSF to come back\u2014<br \/>\n674393_46328480_0<br \/>\nSince wear accumulates with every kilometer you ride, it&#8217;s surprisingly easy not to notice the gradual degradation that builds up over time! \u266a<br \/>\nI wonder when the GSF will be back soon~<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;We ran a maintenance campaign and got to see the condition of all kinds of oil-cooled heads. Cam scuffing concerns \u2605 loud valve noise \u2605 never checked before so want to confirm \u2605 and all sorts of other opinions come in. About cam scuffing&#8230; the degree of scuffing varies quite a bit, and with proper oil management and stable oil pressure and temperature, we think you can overcome it quite a lot. However, if your oil temperature just keeps climbing and climbing, try shutting off the engine at traffic lights. You can suppress the oil temperature quite a bit just by doing that. [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":84145,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"pochipp_cv_data":"","swell_btn_cv_data":"","footnotes":""},"categories":[1924],"tags":[55],"class_list":["post-84146","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-everyday-events","tag-old-blog"],"_links":{"self":[{"href":"https:\/\/www.decoboco.info\/en\/wp-json\/wp\/v2\/posts\/84146","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.decoboco.info\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.decoboco.info\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.decoboco.info\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.decoboco.info\/en\/wp-json\/wp\/v2\/comments?post=84146"}],"version-history":[{"count":0,"href":"https:\/\/www.decoboco.info\/en\/wp-json\/wp\/v2\/posts\/84146\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.decoboco.info\/en\/wp-json\/wp\/v2\/media\/84145"}],"wp:attachment":[{"href":"https:\/\/www.decoboco.info\/en\/wp-json\/wp\/v2\/media?parent=84146"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.decoboco.info\/en\/wp-json\/wp\/v2\/categories?post=84146"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.decoboco.info\/en\/wp-json\/wp\/v2\/tags?post=84146"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}