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techtalk:ref:carb01j [2019/09/08 21:29] hippysmack created |
techtalk:ref:carb01j [2019/09/10 01:09] hippysmack [Throttle Cable] |
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| ====== Throttle Cable ====== | ====== Throttle Cable ====== | ||
| + | This is IronMick's drawing of a new throttle cable made for the Mikuni VM38-9 on a 1978 with stock low buckhorn handlebars. \\ | ||
| + | The universal cable made by Barnett for this application is Barnett part number 101-31-30901. \\ | ||
| + | It is described as a 38" cable, and is about 4" too long for this bike setup so a new one was made. \\ | ||
| + | <blockquote>I do not understand how they calculate cable length but this must be a 34" cable as it is 4" shorter than the 38". | ||
| + | Here is the spec diagram for the 4" shorter throttle cable; if you need to get one special made you can use this as a guide.</blockquote> ((IronMick)) \\ | ||
| + | Note that the two 90° fittings are not the same. The one to the right is for the carb, the one to the left is for the throttle at the handlebar. \\ | ||
| + | Click on a pic to enlarge: \\ | ||
| + | |||
| + | {{:techtalk:ref:carb:vm38-9_throttle_cable_specs_by_ironmick_-_shrunken_sized.jpg?direct&400|}} ((drawing by IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1644516)) \\ | ||
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| + | There are a couple of things you will have to consider regarding a Mikuni installation. First is the throttle control. ((piniongear of the XLFORUM http://xlforum.net/forums/showthread.php?t=938090&page=3)) \\ | ||
| + | The Bendix uses a solid wire and the Mikuni needs a flexible braid cable. \\ | ||
| + | So if you are now using the original enclosed hard wire in the handlebar you will need to swap for a drum type twist grip like the one below. \\ | ||
| + | The Mikuni is a tall carb and as a result you will need a 90° elbow on the throttle cable to route the cable under the gas tank. \\ | ||
| + | On a Sportster you must have this elbow. See the pics below. Trying to find this elbow with the proper throttle cable can sometimes be a chore. \\ | ||
| + | The throttle cable has a shorter outer housing (shorter by length of the elbow) than what you will have on a cable not using the elbow. \\ | ||
| + | You will need to connect the round carb body to the flanged manifold, so that requires an adapter. \\ | ||
| + | All this uses hose clamps to do the job. See the pic below showing the 2 clamps around the adapter. \\ | ||
| + | |||
| + | {{:techtalk:ref:carb:braided_throttle_cable_1_by_piniongear.jpg?direct&300|}} ((photo by piniongear of the XLFORUM http://xlforum.net/forums/showthread.php?t=938090&page=3)) {{:techtalk:ref:carb:braided_throttle_cable_2_by_piniongear.jpg?direct&300|}} ((photo by piniongear of the XLFORUM http://xlforum.net/forums/showthread.php?t=938090&page=3)) \\ | ||
| + | |||
| File any rough spots from the ball end and / or open up the ferrule a bit with a flat blade screwdriver. ((IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1567528&page=2)) \\ | File any rough spots from the ball end and / or open up the ferrule a bit with a flat blade screwdriver. ((IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1567528&page=2)) \\ | ||
| {{:techtalk:ref:carb:vm-38_project_10_by_ironmick.jpg?direct&250|}} ((photo by IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1567528&page=2)) {{:techtalk:ref:carb:vm-38_project_11_by_ironmick.jpg?direct&300|}} ((photo by IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1567528&page=2)) \\ | {{:techtalk:ref:carb:vm-38_project_10_by_ironmick.jpg?direct&250|}} ((photo by IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1567528&page=2)) {{:techtalk:ref:carb:vm-38_project_11_by_ironmick.jpg?direct&300|}} ((photo by IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1567528&page=2)) \\ | ||
