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Classic Goldwing Technical Forums
Engine & Fuel System Modifications
canuckxxxx's Single carb manifold build
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<blockquote data-quote="canuckxxxx" data-source="post: 103711" data-attributes="member: 2409"><p>Well I put the accel. cam back on today and started the bike up and let it warm up completely. I went through the tuning procedure shown here</p><p><a href="https://www.carburetion.com/Weber/adjust.htm" target="_blank">https://www.carburetion.com/Weber/adjust.htm</a></p><p>I found that the idle mixture screw had to be backed out about 2 1/2 turns for smooth idle. According to them this would mean that I need larger low speed jets. It should only take about 1 to 1 1/2 turns out to get good idle if the jetting is right. But I think I will wait until I have the plenum heated and then test again before I start changing jets.</p><p></p><p>I also notice, after doing that, that there was less stumble when blipping the throttle than what I had before. This could be because of the idle adjustment I made but could also be due to me taking the accel. cam off and putting it back on again. Spray doesn't seem as much as before but hard to say for sure. I can only go so far with tuning on the driveway. I really need to do some road testing now but weather will not permit that for a while.</p><p></p><p>The next logical step would be to work on getting heat to the plenum. So I will turn my attention to that now. </p><p></p><p>This is probably a topic for another thread. </p><p>My ultimate plan is to build the manifold using 1 1/4" grab rail which puts the plenum right on top of the coolant lines on the top of the engine. In fact I need 1/4" thick spacers under the runner flanges in order to raise the plenum up enough to clear the plumbing. I am thinking that I might be able to make a mold of a shape that would fit closely over the coolant lines and the underside of the plenum and then cast it out of aluminum. Maybe I can put a big blob of modeling clay on top of the engine and then squash the manifold/plenum down to get the shape. So that heat can be conducted right to the plenum bottom. </p><p></p><p>Do any of you guys have experience with casting aluminum?</p><p></p><p>Brian</p></blockquote><p></p>
[QUOTE="canuckxxxx, post: 103711, member: 2409"] Well I put the accel. cam back on today and started the bike up and let it warm up completely. I went through the tuning procedure shown here [url=https://www.carburetion.com/Weber/adjust.htm]https://www.carburetion.com/Weber/adjust.htm[/url] I found that the idle mixture screw had to be backed out about 2 1/2 turns for smooth idle. According to them this would mean that I need larger low speed jets. It should only take about 1 to 1 1/2 turns out to get good idle if the jetting is right. But I think I will wait until I have the plenum heated and then test again before I start changing jets. I also notice, after doing that, that there was less stumble when blipping the throttle than what I had before. This could be because of the idle adjustment I made but could also be due to me taking the accel. cam off and putting it back on again. Spray doesn't seem as much as before but hard to say for sure. I can only go so far with tuning on the driveway. I really need to do some road testing now but weather will not permit that for a while. The next logical step would be to work on getting heat to the plenum. So I will turn my attention to that now. This is probably a topic for another thread. My ultimate plan is to build the manifold using 1 1/4" grab rail which puts the plenum right on top of the coolant lines on the top of the engine. In fact I need 1/4" thick spacers under the runner flanges in order to raise the plenum up enough to clear the plumbing. I am thinking that I might be able to make a mold of a shape that would fit closely over the coolant lines and the underside of the plenum and then cast it out of aluminum. Maybe I can put a big blob of modeling clay on top of the engine and then squash the manifold/plenum down to get the shape. So that heat can be conducted right to the plenum bottom. Do any of you guys have experience with casting aluminum? Brian [/QUOTE]
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Engine & Fuel System Modifications
canuckxxxx's Single carb manifold build
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