{"id":49494,"date":"2018-02-08T19:39:55","date_gmt":"2018-02-08T10:39:55","guid":{"rendered":"https:\/\/www.decoboco.info\/en\/?p=49494"},"modified":"2026-09-24T13:45:09","modified_gmt":"2026-09-24T04:45:09","slug":"cb400sf-super-boldor-carburettor-maintenance-and-more","status":"publish","type":"post","link":"https:\/\/www.decoboco.info\/en\/20180208\/everyday-events\/cb400sf-super-boldor-carburettor-maintenance-and-more","title":{"rendered":"CB400SF Super Boldor Carburettor Maintenance and More"},"content":{"rendered":"<p><img decoding=\"async\" class=\"alignnone size-full wp-image-49472\" src=\"https:\/\/www.decoboco.info\/wp-content\/uploads\/2018\/02\/DSC_6637.jpg\" alt=\"\" width=\"1024\" height=\"683\" \/><br \/>\nWe determined there was a slight secondary air leak. The customer also requested carburettor maintenance.<\/p>\n<p><!--more--><\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-49473\" src=\"https:\/\/www.decoboco.info\/wp-content\/uploads\/2018\/02\/DSC_6634.jpg\" alt=\"\" width=\"1024\" height=\"683\" \/><br \/>\nWe removed the carburettor. It has a shape that could be called the final form of a negative-pressure carburettor.<br \/>\nThat&#8217;s Honda engineering for you.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-49474\" src=\"https:\/\/www.decoboco.info\/wp-content\/uploads\/2018\/02\/DSC_6630.jpg\" alt=\"\" width=\"1024\" height=\"683\" \/><br \/>\nBefore we get into disassembly, I should mention that the angled fuel hose\u2014a part commonly used on Honda bikes\u2014is fine while you can still get it, but becomes a hassle when it&#8217;s discontinued.<\/p>\n<p>This one is just the angled type with an inner diameter of 10 mm\u2014pretty thick! But like the RC30 we worked on recently, there are also angled hoses with different diameters. The one at the fuel cock side is as thick as a breather hose, then tapers down at the carburettor side. And it&#8217;s discontinued too. Nowadays you can search by part number online and find these things\u2014modern convenience.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-49475\" src=\"https:\/\/www.decoboco.info\/wp-content\/uploads\/2018\/02\/P1680919.jpg\" alt=\"\" width=\"1024\" height=\"684\" \/> <img decoding=\"async\" class=\"alignnone size-full wp-image-49476\" src=\"https:\/\/www.decoboco.info\/wp-content\/uploads\/2018\/02\/P1680920.jpg\" alt=\"\" width=\"1024\" height=\"684\" \/><br \/>\nThe condition wasn&#8217;t bad, but it was definitely sucking hard from the engine side.<br \/>\nI&#8217;m impressed by Honda&#8217;s attention to detail\u2014even the fit and band position are engineered into the OEM part.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-49477\" src=\"https:\/\/www.decoboco.info\/wp-content\/uploads\/2018\/02\/P1680924.jpg\" alt=\"\" width=\"1024\" height=\"684\" \/><br \/>\nBack to the carburettor. The float level is the kind you don&#8217;t mess with. It&#8217;s reassuring to see such confidence in the design.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-49478\" src=\"https:\/\/www.decoboco.info\/wp-content\/uploads\/2018\/02\/P1680925.jpg\" alt=\"\" width=\"1024\" height=\"684\" \/><br \/>\nThe float valve seat looks press-fit too. That means no side leaks.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-49479\" src=\"https:\/\/www.decoboco.info\/wp-content\/uploads\/2018\/02\/P1680927.jpg\" alt=\"\" width=\"1024\" height=\"684\" \/><br \/>\nSquare-plus-plate slide valve. Single hole. Doesn&#8217;t look like it&#8217;ll wear down.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-49480\" src=\"https:\/\/www.decoboco.info\/wp-content\/uploads\/2018\/02\/P1680933.jpg\" alt=\"\" width=\"1024\" height=\"684\" \/><br \/>\nThe slide valve shows virtually no wear\u2014reassuring.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-49481\" src=\"https:\/\/www.decoboco.info\/wp-content\/uploads\/2018\/02\/P1680928.jpg\" alt=\"\" width=\"1024\" height=\"684\" \/><br \/>\nThe tank looks rust-free\u2014good news.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-49482\" src=\"https:\/\/www.decoboco.info\/wp-content\/uploads\/2018\/02\/P1680930.jpg\" alt=\"\" width=\"1024\" height=\"684\" \/> <img decoding=\"async\" class=\"alignnone size-full wp-image-49483\" src=\"https:\/\/www.decoboco.info\/wp-content\/uploads\/2018\/02\/P1680929.jpg\" alt=\"\" width=\"1024\" height=\"684\" \/><br \/>\nThe angled design looks like an FCR. Even with the same carburettor type, just a different maker makes this much difference\u2014that&#8217;s what struck me.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-49484\" src=\"https:\/\/www.decoboco.info\/wp-content\/uploads\/2018\/02\/P1680932.jpg\" alt=\"\" width=\"1024\" height=\"684\" \/><br \/>\nWe quickly cleaned it and checked the passages. We couldn&#8217;t adjust it, but we did verify the fuel level.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-49394\" src=\"https:\/\/www.decoboco.info\/wp-content\/uploads\/2018\/02\/P1680934.jpg\" alt=\"\" width=\"1024\" height=\"684\" \/> <img decoding=\"async\" class=\"alignnone size-full wp-image-49485\" src=\"https:\/\/www.decoboco.info\/wp-content\/uploads\/2018\/02\/P1680935.jpg\" alt=\"\" width=\"1024\" height=\"684\" \/><br \/>\nThat&#8217;s how we balanced the carburetors.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-49486\" src=\"https:\/\/www.decoboco.info\/wp-content\/uploads\/2018\/02\/P1680936.jpg\" alt=\"\" width=\"1024\" height=\"684\" \/><br \/>\nThe customer asked us to do something about the fluid hose that looked ready to break.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-49487\" src=\"https:\/\/www.decoboco.info\/wp-content\/uploads\/2018\/02\/P1680938.jpg\" alt=\"\" width=\"1024\" height=\"684\" \/><br \/>\nWe shortened it and tucked it inside.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-49488\" src=\"https:\/\/www.decoboco.info\/wp-content\/uploads\/2018\/02\/P1680937.jpg\" alt=\"\" width=\"1024\" height=\"684\" \/><br \/>\nThe customer wanted the pedal lower.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-49489\" src=\"https:\/\/www.decoboco.info\/wp-content\/uploads\/2018\/02\/P1680939.jpg\" alt=\"\" width=\"1024\" height=\"684\" \/><br \/>\nWe removed the master cylinder and pressed off about 10 mm.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-49490\" src=\"https:\/\/www.decoboco.info\/wp-content\/uploads\/2018\/02\/P1680940.jpg\" alt=\"\" width=\"1024\" height=\"684\" \/><br \/>\nThis should make it easier to ride.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-49491\" src=\"https:\/\/www.decoboco.info\/wp-content\/uploads\/2018\/02\/P1680917.jpg\" alt=\"\" width=\"1024\" height=\"684\" \/><br \/>\nGoing back to when we removed the carburettor: one piece broke\u2014honestly, aluminum at the clutch wire bracket isn&#8217;t ideal.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-49492\" src=\"https:\/\/www.decoboco.info\/wp-content\/uploads\/2018\/02\/P1680918.jpg\" alt=\"\" width=\"1024\" height=\"684\" \/><br \/>\nAluminum was nice for easy removal, though.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-49493\" src=\"https:\/\/www.decoboco.info\/wp-content\/uploads\/2018\/02\/P1680941.jpg\" alt=\"\" width=\"1024\" height=\"684\" \/><br \/>\nI think steel would be better.<\/p>\n<p>After a test ride, we&#8217;ll be done.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>We determined there was a slight secondary air leak. The customer also requested carburettor maintenance.<\/p>\n","protected":false},"author":2,"featured_media":49472,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"pochipp_cv_data":"","swell_btn_cv_data":"","footnotes":""},"categories":[1924],"tags":[136,114,194],"class_list":["post-49494","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-everyday-events","tag-carb-maintenance","tag-cb400sf","tag-rc30"],"_links":{"self":[{"href":"https:\/\/www.decoboco.info\/en\/wp-json\/wp\/v2\/posts\/49494","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=49494"}],"version-history":[{"count":0,"href":"https:\/\/www.decoboco.info\/en\/wp-json\/wp\/v2\/posts\/49494\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.decoboco.info\/en\/wp-json\/wp\/v2\/media\/49472"}],"wp:attachment":[{"href":"https:\/\/www.decoboco.info\/en\/wp-json\/wp\/v2\/media?parent=49494"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.decoboco.info\/en\/wp-json\/wp\/v2\/categories?post=49494"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.decoboco.info\/en\/wp-json\/wp\/v2\/tags?post=49494"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}