Differences

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--- techtalk:ref:carb01j [2019/09/08 21:29]
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+++ techtalk:ref:carb01j [2024/01/10 18:29]
hippysmack
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 ====== Mounting a Mikuni VM-38 ======
-With the VM38 there are several things you want to make sure you get with the carb, or purchase separately. ((piniongear of the XLFORUM http://xlforum.net/forums/showthread.php?t=1286437&page=2)) \\
+With the VM38 there are several things you want to make sure you get with the carb, or purchase separately. ((piniongear of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/126559-best-carb-for-kick-only-72-xlch/page2?t=1286437&page=2)) \\
 The 90° elbow and the correct throttle cable to go with it. The p/n for the cable is either 657-900 or 657-901. \\
 The cable has a little longer inner cable (or a little shorter housing) due to the length of the elbow. \\
@@ Line 36: / Line 36: @@
 These type metal adapters are also available. ((photos by GA_Ironhead of the XLFORUM http://xlforum.net/forums/showpost.php?p=2163034&postcount=5)) \\
+(Right) - Carb Adapter, HRS-42 and OEM CV Carb To S-and-S Super E Manifold. ((https://secure.vulcanworks.net/store/Carb-Adapter-HRS-42-and-OEM-CV-Carb-To-S-and-S-Super-E-Manifold.html)) \\
 {{:techtalk:ref:carb:press-on_carb_adapter.jpg?direct&300|}} {{:techtalk:ref:carb:non_press_carb_adapter.jpg?direct&300|}}
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 ====== 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)) \\
+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)) \\
 {{: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)) \\

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