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Post by Guba on Oct 22, 2015 9:55:49 GMT
Probably due to all the rust which was clogging the petcock screen. That was my summer job to get the 450 back running.
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jax
New Member
Posts: 37
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Post by jax on Oct 22, 2015 20:46:12 GMT
Almost all the 450's I get the chrome on the pipes coming off the head have almost all the chrome burnt off if the bike has more than 10000 miles on it. From the factory the bikes must of ran very lean.
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Post by OldSchool on Oct 23, 2015 0:06:26 GMT
Almost all the 450's I get the chrome on the pipes coming off the head have almost all the chrome burnt off if the bike has more than 10000 miles on it. From the factory the bikes must of ran very lean. I had also thought that Honda had set the 450's up lean but I found out later they are actually a bit on the rich side. Best I can tell 1986 and 1987 was before EPA got into them really hard. Most of these almost 30 year old carburetors have done their share of sitting up and sitting up is really hard on carbs and at some point the carbs leaned out and blued the chrome on the exhaust. There is only three ways to get the chrome pipes hot enough to turn blue, running the engine lean, to much full advanced timing, or an exhaust valve not seating.
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Post by Guba on Oct 23, 2015 1:24:41 GMT
Well at the moment my bike occasionally backfires on deceleration, so I take it that enough fuel is going through. And since my gas mileage seems to be on the low side, so maybe the lean condition is taken care of.
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Post by OldSchool on Oct 23, 2015 4:21:56 GMT
Backfiring is a sign of either running lean or the air cutoff valves are bad. Please don't think I am a know it all! For I am truly concerned to the point that I will send you a set of working carbs at no charge if it will prevent damage to your engine. Please run a plug check.
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Post by wjmrty on Oct 23, 2015 23:29:19 GMT
Looks nice guba same colour as my 450
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DNC
New Member
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Post by DNC on Oct 24, 2015 0:36:38 GMT
Nice job Guba, it looks good. Love the color Old School, we gotta talk about those Mikuni carbs! PM sent
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Post by OldSchool on Oct 26, 2015 16:48:01 GMT
Making a set of intake manifolds for the 450 to accept the Mikuni carbs, this will get rid of a very tight bend in the stock insulators (intake) and the stock insulators are getting hard to find. I did not want a weld where the tube met up with the flange so these are cut form solid stock with 0-ring seal.
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Post by Guba on Oct 27, 2015 2:27:47 GMT
Awesome! I presume aluminum?
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Post by OldSchool on Oct 27, 2015 2:32:24 GMT
Awesome! I presume aluminum? Yes, aluminum would be correct.
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Post by OldSchool on Nov 7, 2015 1:15:35 GMT
Finally got the new intake manifolds on and tested them for a few hundred miles as for as more power goes well maybe but not enough to really mention but I can say it surely did not hurt anything. The gas mileage did go up from 58 mpg to 63.2 mpg and that was a surprise because I was not at any time trying to see how high I could get the gas mileage all the runs were driving 55 to 70mph most of the time around 65mph with a little heavy traffic and a few traffic lights thrown in.
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