{"id":9949,"date":"2012-10-29T15:15:55","date_gmt":"2012-10-29T20:15:55","guid":{"rendered":"http:\/\/www.chinonthetank.com\/?p=9949"},"modified":"2012-10-29T15:23:31","modified_gmt":"2012-10-29T20:23:31","slug":"hurricane-head-teardown","status":"publish","type":"post","link":"https:\/\/www.chinonthetank.com\/2012\/10\/hurricane-head-teardown\/","title":{"rendered":"Hurricane Head teardown"},"content":{"rendered":"<p>My work Drexel University is closed for the next 2 days because of a hurricane, so I decided now would be a good time to get started on my cb475 supersport build.<\/p>\n<p>Let me recap what I&#8217;m doing&#8230;<br \/>\nI have a 73 cb450 that I put a 75 cb500t engine into last year. (Hence cb475)<br \/>\n<a href=\"https:\/\/www.chinonthetank.com\/2011\/09\/cb450-cb500t-hybrid-\u2013-part-3\/\">Read about that HERE.<\/a><\/p>\n<p>The head gasket leaks&#8230; so I&#8217;m going to tear the engine apart and rebuild the damn thing into a super hybrid engine. (Hence supersport)<\/p>\n<ul>\n<li>I&#8217;m going to put a 450 head on the 500t cylinders because it has a smaller combustion area, so it will yield higher compression. I bought a used 450 head on ebay.<\/li>\n<li>Also going to put 10.6 high compression pistons in it from <a href=\"http:\/\/charlies-place.com\/PAGES\/Store\/store_cb450_piston_kits.html\">Charlie&#8217;s Place.<\/a><\/li>\n<li>And going to also replace the valves, rocker arms and cams&#8230; which you&#8217;ll see why. Keep reading&#8230;<\/li>\n<\/ul>\n<div class=\"cott-article__copy-img\"><a href=\"https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2012\/10\/450-head-01.jpg\"><img decoding=\"async\" src=\"https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2012\/10\/450-head-01.jpg\" \/><\/a><\/div>\n<p>Get the cams out.<\/p>\n<div class=\"cott-article__copy-img\"><a href=\"https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2012\/10\/450-head-02.jpg\"><img decoding=\"async\" src=\"https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2012\/10\/450-head-02.jpg\" \/><\/a><\/div>\n<div class=\"cott-article__copy-img\"><a href=\"https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2012\/10\/450-head-03.jpg\"><img decoding=\"async\" src=\"https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2012\/10\/450-head-03.jpg\" \/><\/a><\/div>\n<p>In case you didn&#8217;t know&#8230; The cb450 \/ 500t have torsion bars instead of valve springs. Ducati can suck it. Honda did it first. So&#8230; no valve springs. The torsion bar is a weird concept. It&#8217;s wound with a spring, so an arm hits the valve open and then the bar returns the valve closed. Apparently this reduced the risk of valve float which is when, at high rpm, the valve  doesn&#8217;t close fast enough and the valve never closes. When valve float occurs, you can burn up a valve and\/or feel surging at high rpm.<\/p>\n<div class=\"cott-article__copy-img\"><a href=\"https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2012\/10\/450-head-04.jpg\"><img decoding=\"async\" src=\"https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2012\/10\/450-head-04.jpg\" \/><\/a><\/div>\n<p>The rocker arms are worn pretty bad. See how they &#8220;dish inward&#8221;. Bad shit. <a href=\"http:\/\/www.thefang.co.uk\/cb500tips.htm#followers\">Read this.<\/a> Apparently this is common on 450 &#038; 500t engines. The cam hits the rocker arm, and then the rocker arm hits the valve to open it. If it&#8217;s worn real shitty like the below picture, you can&#8217;t adjust the valves to spec. I&#8217;m going to get new ones from <a href=\"http:\/\/www.m3racing.com\/products\/parts.html#CB450\/500\">M3 racing<\/a> which are harder. Also, it looks like a piece of the rocker arm broke off and damaged the cams a tiny bit from bouncing around.<\/p>\n<div class=\"cott-article__copy-img\"><a href=\"https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2012\/10\/450-head-05.jpg\"><img decoding=\"async\" src=\"https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2012\/10\/450-head-05.jpg\" \/><\/a><\/div>\n<p>Valves are shitty too and where they seat in the head isn&#8217;t the best. I found new NOS valves on ebay. Going to buy them, and lap them in. Valves guides seem okay&#8230; I think.<\/p>\n<div class=\"cott-article__copy-img\"><a href=\"https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2012\/10\/450-head-06.jpg\"><img decoding=\"async\" src=\"https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2012\/10\/450-head-06.jpg\" \/><\/a><\/div>\n<div class=\"cott-article__copy-img\"><a href=\"https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2012\/10\/450-head-07.jpg\"><img decoding=\"async\" src=\"https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2012\/10\/450-head-07.jpg\" \/><\/a><\/div>\n<p>Once you get all the shit out, you can access the valve seals right above the guides. Going to be replacing these guys later.<\/p>\n<div class=\"cott-article__copy-img\"><a href=\"https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2012\/10\/450-head-08.jpg\"><img decoding=\"async\" src=\"https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2012\/10\/450-head-08.jpg\" \/><\/a><\/div>\n<div class=\"cott-article__copy-img\"><a href=\"https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2012\/10\/450-head-09.jpg\"><img decoding=\"async\" src=\"https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2012\/10\/450-head-09.jpg\" \/><\/a><\/div>\n<p>Cams are fucked like I said earlier. They&#8217;re scored to the point where I&#8217;m going to look for another set of good condition used ones, or buy new high-lift cams from <a href=\"http:\/\/www.m3racing.com\/products\/parts.html#CB450\/500\">M3 racing<\/a>. Not sure if I want to get high lift cams though&#8230;<\/p>\n<div class=\"cott-article__copy-img\"><a href=\"https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2012\/10\/450-head-10.jpg\"><img decoding=\"async\" src=\"https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2012\/10\/450-head-10.jpg\" \/><\/a><\/div>\n<p>All done.<\/p>\n<div class=\"cott-article__copy-img\"><a href=\"https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2012\/10\/450-head-11.jpg\"><img decoding=\"async\" src=\"https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2012\/10\/450-head-11.jpg\" \/><\/a><\/div>\n<p>Empty head now.<\/p>\n<p>Time to figure out what I want to order new, and what I want to try and pull from my 500t head and use the best parts from both.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>My work Drexel University is closed for the next 2 days because of a hurricane, so I decided now would be a good time to get started on my cb475 supersport build. Let me recap what I&#8217;m doing&#8230; I have a 73 cb450 that I put a 75 cb500t engine into last year. (Hence cb475) [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":9955,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[3,24],"tags":[],"_links":{"self":[{"href":"https:\/\/www.chinonthetank.com\/wp-json\/wp\/v2\/posts\/9949"}],"collection":[{"href":"https:\/\/www.chinonthetank.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.chinonthetank.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.chinonthetank.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.chinonthetank.com\/wp-json\/wp\/v2\/comments?post=9949"}],"version-history":[{"count":5,"href":"https:\/\/www.chinonthetank.com\/wp-json\/wp\/v2\/posts\/9949\/revisions"}],"predecessor-version":[{"id":9956,"href":"https:\/\/www.chinonthetank.com\/wp-json\/wp\/v2\/posts\/9949\/revisions\/9956"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.chinonthetank.com\/wp-json\/wp\/v2\/media\/9955"}],"wp:attachment":[{"href":"https:\/\/www.chinonthetank.com\/wp-json\/wp\/v2\/media?parent=9949"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.chinonthetank.com\/wp-json\/wp\/v2\/categories?post=9949"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.chinonthetank.com\/wp-json\/wp\/v2\/tags?post=9949"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}