{"id":11465,"date":"2013-09-24T14:24:54","date_gmt":"2013-09-24T19:24:54","guid":{"rendered":"http:\/\/www.chinonthetank.com\/?p=11465"},"modified":"2021-08-24T12:48:26","modified_gmt":"2021-08-24T17:48:26","slug":"high-compression-cb450-6-month-recap","status":"publish","type":"post","link":"https:\/\/www.chinonthetank.com\/2013\/09\/high-compression-cb450-6-month-recap\/","title":{"rendered":"high compression 500t &#8211; 6mo recap"},"content":{"rendered":"<p><a href=\"https:\/\/www.chinonthetank.com\/2021\/04\/2021-cb450-rebuild\/\">2021 update \u2013 click here. Below is deprecated info\u2026<\/a><\/p>\n<div class=\"cott-article__copy-img\"><a href=\"https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2013\/09\/cb450-01.jpg\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2013\/09\/cb450-01.jpg\" alt=\"cb450-01\" width=\"1400\" height=\"927\" class=\"alignnone size-full wp-image-11467\" srcset=\"https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2013\/09\/cb450-01.jpg 1400w, https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2013\/09\/cb450-01-500x331.jpg 500w, https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2013\/09\/cb450-01-1024x678.jpg 1024w\" sizes=\"(max-width: 1400px) 100vw, 1400px\" \/><\/a><\/div>\n<p>It annoys me when I see cycles on eBay that say &#8220;Fresh rebuilt engine. 10 miles on it since rebuild. Runs great.&#8221; etc&#8230; Fucking stupid. I would never buy a bike like that unless the owner has put like 1000 miles on the rebuilt engine to confirm shit is good.<\/p>\n<p>Anyway&#8230; someone asked me if my bike is running good since the rebuild. Figured I&#8217;d do a 6 month re-cap of the good and the bad.<\/p>\n<p>If you don&#8217;t know about this engine rebuild I did&#8230; <a href=\"https:\/\/www.chinonthetank.com\/2013\/02\/cb500t-engine-rebuild-part-4\/\">read about it here<\/a>. 500t engine in a 450. <\/p>\n<p>8 months ago when I initially thought of doing this high-compression engine build&#8230; I couldn&#8217;t find comparable info out there for a cb450\/500t. I didn&#8217;t know if it&#8217;d blow itself up after a month, or how it&#8217;d hold up as a street bike. So&#8230; I hope this post helps somebody in the future.<\/p>\n<ul>\n<li><strong>Piston Kit<\/strong> &#8211;<br \/>\nIts a 500t engine&#8230; not a 450. I&#8217;m estimating my compression ratio is somewhere between 10.5 and 11 with the Todd Henning race piston kit and decked cylinders&#8230; which is pretty damn high for this bike. I run 93 octane gas and haven&#8217;t had any issues. No detonating \/ pinging. Seems totally fine. *Read the last bullet point for info about the overbore from 70mm to 74mm and if it&#8217;s right for your bike.<br \/>\n<em>Analysis &#8211; I recommend that piston kit&#8230; even for a street bike<\/em><\/li>\n<li><strong>Head Gasket<\/strong> &#8211;<br \/>\nI had to re-do my head gasket due to it letting a little oil by. let me clarify&#8230; I have the copper head gasket that comes with the henning piston kit. Fuck copper gaskets. Pain in the ass to get to seal. I redid it once 2 months ago using the Permatek Copper paste in a tube, and it&#8217;s been holding now. It&#8217;s a 74mm bore, so I can&#8217;t run a oem head gasket. I actually just found that Mark from M3 Racing sells an oversized composite head gasket. I just bought that and am going to pull the head again, and convert to the paper\/composite gasket and use indian head gasket sealer&#8230; and torque 10lbs over what the bolt spec is.<br \/>\n<em>Analysis &#8211; I do NOT recommend a copper head gasket. Use a paper\/composite with indian head gasket sealer and over torque bolts a bit<\/em><\/li>\n<li><strong>Air Fuel Settings<\/strong> &#8211;<br \/>\nI opened my stock exhausts a bit by punching the baffles out. And I run Uni pod filters. I have stock jetting. 38 slow and 145 main. This ended up being the best. I initially increased the main jet to a 150 which totally rips high rpm, but the main jet feeds the slow jet with these carbs&#8230; and that wasn&#8217;t good. It bogged a bit down low.<br \/>\n<em>Analysis &#8211; with oem constant velocity carbs&#8230; I recommend stock jetting is the overall best<\/em><\/li>\n<li><strong>Timing<\/strong> &#8211;<br \/>\nI run the Pamco electronic ignition. The more I advance it the better the bike seems to run and the more it rips high rpm. I don&#8217;t think I would ever suggest running points with the set-up I have.<br \/>\n<em>Analysis &#8211; I recommend the Pamco electronic ignition advanced a decent amount &#8211; use your judgement.<\/em><\/li>\n<li><strong>Is it faster?<\/strong> &#8211;<br \/>\nHellz yea it&#8217;s faster. For a little 500 twin&#8230; The bike rips now. Especially high rpm. I have brand new clutch plates and springs and still lets loose high rpm sometimes. Don&#8217;t expect the bike to outrun a cb550 four. It might be a tie. But that&#8217;s pretty fast compared to a normal oem stock cb450 or 500t. It def rips up to 100mph pretty fast now, where before it seemed to take longer.<br \/>\n<em>Analysis &#8211; If you want to go faster&#8230; bigger higher compression pistons will do it.<\/em><\/li>\n<li><strong>Is it reliable?<\/strong> &#8211;<br \/>\nUmm&#8230; it seems decently reliable. When I pulled the head the first time to reseal the head gasket&#8230; all the parts looked great. Not overheated at all. No scoring. Nothing fucked up. Other than dealing with a shitty copper head gasket, everything is great. Def install a brand new cam chain!!! Once I convert to the paper\/composite head gasket, it should be even more solid. I&#8217;ll say this&#8230; I rode this bike across the country 4 years ago when it was all stock oem condition. I wouldn&#8217;t do that now with the higher compression. Maybe it&#8217;d be fine&#8230; but I&#8217;d rather not.<br \/>\n<em>Analysis &#8211; As a city ripper, yes it seems totally reliable. As a long traveling distance cycle&#8230; probably not anymore.<\/em><\/li>\n<li><strong>Would I build it like this again or change stuff?<\/strong> &#8211;<br \/>\nIf this was my only bike, I would not bore it out 50cc over from 70mm to 74mm. Apparently this makes the cylinder walls kinda thin which is another reason i&#8217;m not sure of the long term reliability. If this was my only bike, I would&#8217;ve found a piston kit that keeps the bore the stock 70mm&#8230; M3 racing makes a kit and so does Charlie Place. Since I have 3 other bikes, I won&#8217;t cry if it blows up in 2 years. I&#8217;ll just rebuild it again. I love the way it runs now. Rips through the gears faster and it&#8217;s just overall kinda cool to have a cb450 with a 500t rebuilt into a 550cc high compression ripper. Don&#8217;t come across them very often eh&#8230; people look confused when I tell them what it is, and that&#8217;s cool.<br \/>\n<em>Analysis &#8211; If this is your only bike&#8230; probably do a stock basic rebuild with pistons that keep the bore 70mm.<\/em><\/li>\n<\/ul>\n<div class=\"cott-article__copy-img\"><a href=\"https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2013\/09\/cb450-02.jpg\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2013\/09\/cb450-02.jpg\" alt=\"cb450-02\" width=\"1400\" height=\"927\" class=\"alignnone size-full wp-image-11468\" srcset=\"https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2013\/09\/cb450-02.jpg 1400w, https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2013\/09\/cb450-02-500x331.jpg 500w, https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2013\/09\/cb450-02-1024x678.jpg 1024w\" sizes=\"(max-width: 1400px) 100vw, 1400px\" \/><\/a><\/div>\n<div class=\"cott-article__copy-img\"><a href=\"https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2013\/09\/cb450-03.jpg\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2013\/09\/cb450-03.jpg\" alt=\"cb450-03\" width=\"1400\" height=\"929\" class=\"alignnone size-full wp-image-11469\" srcset=\"https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2013\/09\/cb450-03.jpg 1400w, https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2013\/09\/cb450-03-500x331.jpg 500w, https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2013\/09\/cb450-03-1024x679.jpg 1024w\" sizes=\"(max-width: 1400px) 100vw, 1400px\" \/><\/a><\/div>\n<div class=\"cott-article__copy-img\"><a href=\"https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2013\/09\/cb450-04.jpg\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2013\/09\/cb450-04.jpg\" alt=\"cb450-04\" width=\"1000\" height=\"1002\" class=\"alignnone size-full wp-image-11470\" srcset=\"https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2013\/09\/cb450-04.jpg 1000w, https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2013\/09\/cb450-04-150x150.jpg 150w, https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2013\/09\/cb450-04-500x500.jpg 500w, https:\/\/www.chinonthetank.com\/wp-content\/uploads\/2013\/09\/cb450-04-300x300.jpg 300w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/a><\/div>\n","protected":false},"excerpt":{"rendered":"<p>2021 update \u2013 click here. Below is deprecated info\u2026 It annoys me when I see cycles on eBay that say &#8220;Fresh rebuilt engine. 10 miles on it since rebuild. Runs great.&#8221; etc&#8230; Fucking stupid. I would never buy a bike like that unless the owner has put like 1000 miles on the rebuilt engine to [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":11467,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[3,6,222],"tags":[],"_links":{"self":[{"href":"https:\/\/www.chinonthetank.com\/wp-json\/wp\/v2\/posts\/11465"}],"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=11465"}],"version-history":[{"count":34,"href":"https:\/\/www.chinonthetank.com\/wp-json\/wp\/v2\/posts\/11465\/revisions"}],"predecessor-version":[{"id":22471,"href":"https:\/\/www.chinonthetank.com\/wp-json\/wp\/v2\/posts\/11465\/revisions\/22471"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.chinonthetank.com\/wp-json\/wp\/v2\/media\/11467"}],"wp:attachment":[{"href":"https:\/\/www.chinonthetank.com\/wp-json\/wp\/v2\/media?parent=11465"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.chinonthetank.com\/wp-json\/wp\/v2\/categories?post=11465"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.chinonthetank.com\/wp-json\/wp\/v2\/tags?post=11465"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}