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Goldwing- The First 20 Years
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Two Wheel Magazine 1975- Honda's GL1000, The Future
Cycle Illustrated, Nov. 1975- 2 Big Ones From Honda
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GL1000- Important GL1000 Service Reminder (1 Page) 6-13-1975
SL #108 Tire and Wheel Rim Matching Information 6-20-75 (7 pages)
Service Tools Newsletter 7-31-75 (2 pages)
SB 1000 #3 Pressurised Cooling System Tester 10-10-75 (3 pages)
SB 1000 #1 Cylinder Head Core Plug Leakage- Revised 7-9-76 (3 pages)
SL #117 Exhaust Pipe and Muffler Paint Damage 9-30-76 (1 page)
SL #118 Instrument Troubleshooting 10-27-76 (5 pages)
PB 1000-2 Changes to Clutch Components 11-3-76 (1 page)
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SB 1000 #11 Final Drive Gear Case Cover Change 10-15-77 (1 page)
SB 1000 #12 New Main Bearing Caps 11-23-77 (1 page)
SB 1000 #13 Recall to Replace Rear Brake Pads 3-21-78 (5 pages)
SB 1000 #14 Cylinder Head Bolt Torque Change 11-8-78 (1 page)
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Special Consumer Report: 1984 and 1985 GW Rear Hub
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Classic Goldwing Technical Forums
Engine & Fuel System Modifications
740 carb review also known as DFT DFTA weber
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<blockquote data-quote="dan filipi" data-source="post: 104339" data-attributes="member: 54"><p>Heat has a profound effect on the carburetor and how it's adjusted so I think it should be mentioned in this thread.</p><p></p><p>Gas simply sprayed into the plenum will not vaporize.</p><p>What is needed is a vacuum in a flow of air.</p><p>A vacuum like exists under the throttle plate, lowers the boiling point of the gas liquid.</p><p>By lowering the boiling point, only then can the raw gas introduced into the manifold vaporize. Vaporized gasoline is what burns. Raw gasoline is more wasted than burned.</p><p></p><p>When heat is added, the raw fuel is vaporized much sooner and faster. Just like on warm days the first start of a cold engine is easier than on cold days because there is more heat available from the air being drawn in.</p><p>Heat together with vacuum is what vaporizes the fuel.</p><p></p><p>The flow design of the vw plenum is directed such that heating the floor of it will drastically increase vaporization of the fuel.</p><p></p><p>How does this all play into the carb?</p><p>Well like magic, the jetting can now be made leaner.</p><p>A leaner fuel to air mixture means better fuel economy.</p><p></p><p>The Weber 32/32dft is of superior design for jetting through all its rpm ranges and throttle openings from idle to redline.</p><p>With this jetting ease, we can customize the jetting to the entire manifold.</p><p>Without heating the plenum, I believe there is no way to achieve mpg comparable to the stock carbs of 40-45 mpg.</p><p>Runner types and air speed come into play here also but the Weber gives us options, and does so well.</p></blockquote><p></p>
[QUOTE="dan filipi, post: 104339, member: 54"] Heat has a profound effect on the carburetor and how it's adjusted so I think it should be mentioned in this thread. Gas simply sprayed into the plenum will not vaporize. What is needed is a vacuum in a flow of air. A vacuum like exists under the throttle plate, lowers the boiling point of the gas liquid. By lowering the boiling point, only then can the raw gas introduced into the manifold vaporize. Vaporized gasoline is what burns. Raw gasoline is more wasted than burned. When heat is added, the raw fuel is vaporized much sooner and faster. Just like on warm days the first start of a cold engine is easier than on cold days because there is more heat available from the air being drawn in. Heat together with vacuum is what vaporizes the fuel. The flow design of the vw plenum is directed such that heating the floor of it will drastically increase vaporization of the fuel. How does this all play into the carb? Well like magic, the jetting can now be made leaner. A leaner fuel to air mixture means better fuel economy. The Weber 32/32dft is of superior design for jetting through all its rpm ranges and throttle openings from idle to redline. With this jetting ease, we can customize the jetting to the entire manifold. Without heating the plenum, I believe there is no way to achieve mpg comparable to the stock carbs of 40-45 mpg. Runner types and air speed come into play here also but the Weber gives us options, and does so well. [/QUOTE]
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Classic Goldwing Technical Forums
Engine & Fuel System Modifications
740 carb review also known as DFT DFTA weber
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