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| techtalk:ref:carb01g [2019/09/08 21:25] – created hippysmack | techtalk:ref:carb01g [2024/01/10 18:15] (current) – hippysmack |
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| ====== Basic Mikuni VM Information ====== | ====== Basic Mikuni VM Information ====== |
| ===== VM Series ===== | ===== VM Series ===== |
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| These are early VM series round slide Mikunis - 34mm, 36mm, or 38mm \\ | These are early VM series round slide Mikunis - 34mm, 36mm, or 38mm \\ |
| Only Mikuni round slide carbs are designated as VM. These are available in different sizes such as VM29, VM34, VM38, VM40 etc. ((piniongear of the XLFORUM http://xlforum.net/forums/showthread.php?t=1675923&page=2)) \\ | Only Mikuni round slide carbs are designated as VM. These are available in different sizes such as VM29, VM34, VM38, VM40 etc. ((piniongear of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/156562-mikuni-vm38-flooding-engine/page2?t=1675923&page=2)) \\ |
| HS and HSR carbs are not round slide. The RS is not a round slide. The TM and TMS/TMX are not a round slide. \\ | HS and HSR carbs are not round slide. The RS is not a round slide. The TM and TMS/TMX are not a round slide. \\ |
| This is a very old school set up for a Sportster. Properly set up, this carb gets good mileage and runs well. ((nemosengineer@yahoo.com of the XLFORUM http://xlforum.net/forums/showthread.php?t=266722)) \\ | This is a very old school set up for a Sportster. Properly set up, this carb gets good mileage and runs well. ((nemosengineer@yahoo.com of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/54836-need-help-identifying-mikuni-carb?t=266722)) \\ |
| **Note Safety Tip**: Cut a piece of bicycle inner tube to stretch over the carb-body and slide-cap to stop the cap from un-screwing. \\ | **Note Safety Tip**: Cut a piece of bicycle inner tube to stretch over the carb-body and slide-cap to stop the cap from un-screwing. \\ |
| This will keep the slide and needle inside the carb on the freeway. \\ | This will keep the slide and needle inside the carb on the freeway. \\ |
| Sudco will get you close. You can also get a little tool kit they sell with the jet wrench's and don't forget the Mikuni pocket tuner. \\ | Sudco will get you close. You can also get a little tool kit they sell with the jet wrench's and don't forget the Mikuni pocket tuner. \\ |
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| Mikuni lists the following Vintage Carb Kits: ((piniongear of the XLFORUM http://xlforum.net/forums/showthread.php?t=765846&page=8)) \\ | Mikuni lists the following Vintage Carb Kits: ((piniongear of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/93137-mikuni-vm38-success-story/page8?t=765846&page=8)) \\ |
| 001-200....HDS-101/38mm.... Sportster/Shovelhead \\ | 001-200....HDS-101/38mm.... Sportster/Shovelhead \\ |
| 001-204....HDS-101A/40mm.... Sportster/Shovelhead \\ | 001-204....HDS-101A/40mm.... Sportster/Shovelhead \\ |
| Several ways are described in the mounting article above. \\ | Several ways are described in the mounting article above. \\ |
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| | The correct version of the VM38 for an ironhead Sportster is the VM38-9. ((IronMick of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/169173-mikuni-sticks-out-too-far/page2?t=1814834&page=2)) ((piniongear of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/93137-mikuni-vm38-success-story/page3?t=765846&page=3)) ((piniongear of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/93137-mikuni-vm38-success-story/page4?t=765846&page=4)) \\ |
| The correct version of the VM38 for an ironhead Sportster is the VM38-9. ((IronMick of the XLFORUM http://xlforum.net/forums/showthread.php?t=1814834&page=2)) ((piniongear of the XLFORUM http://xlforum.net/forums/showthread.php?t=765846&page=3)) ((piniongear of the XLFORUM http://xlforum.net/forums/showthread.php?t=765846&page=4)) \\ | The VM38-"9" was setup and extensively tested by Jerry Branch for the stock Sportster engine using flow bench tech for the time. ((simeli of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/151596-re-jetting-the-vm38-9-2/page2?t=1636803&page=2)) \\ |
| The VM38-"9" was setup and extensively tested by Jerry Branch for the stock Sportster engine using flow bench tech for the time. ((simeli of the XLFORUM http://xlforum.net/forums/showthread.php?t=1636803&page=2)) \\ | |
| It is going to be hard to find that you are going to be able to improve on it as supplied. Unless you are running a stroker or highly modified heads and cams. \\ | It is going to be hard to find that you are going to be able to improve on it as supplied. Unless you are running a stroker or highly modified heads and cams. \\ |
| Then the as supplied needles and jets are going to be your best option. Clean it out and replace with the normal "9" needles and jets. \\ | Then the as supplied needles and jets are going to be your best option. Clean it out and replace with the normal "9" needles and jets. \\ |
| There were a bunch of different VM's (round slide) from 16MM on up to 44MM with the vast majority of them designed for 2 cycle engines. \\ | There were a bunch of different VM's (round slide) from 16MM on up to 44MM with the vast majority of them designed for 2 cycle engines. \\ |
| The VM-38 Standard Right body may be the same for all of the 38MM units. \\ | The VM-38 Standard Right body may be the same for all of the 38MM units. \\ |
| However, all the particulars have to be correct for the VM38-9. Below is the list of all the things that make it a "9". ((simeli of the XLFORUM http://xlforum.net/forums/showthread.php?t=1675923)) \\ | However, all the particulars have to be correct for the VM38-9. Below is the list of all the things that make it a "9". ((simeli of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/156562-mikuni-vm38-flooding-engine?t=1675923)) \\ |
| * Bore Size : 38mm | * Bore Size : 38mm |
| * Spigot Mount : 43mm | * Spigot Mount : 43mm |
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| This particular model is a VM-38mm. It has no numbers on it other than "Mikuni KOGYO". \\ | This particular model is a VM-38mm. It has no numbers on it other than "Mikuni KOGYO". \\ |
| {{:techtalk:ref:carb:38mm_mikuni_vm_pic_1_by_sturgmachinist.jpg?direct&300|}} ((photo by sturgmachinist of the XLFORUM http://xlforum.net/forums/showpost.php?p=1361935&postcount=1)) {{:techtalk:ref:carb:38mm_mikuni_vm_pic_2_by_sturgmachinist.jpg?direct&300|}} ((photo by sturgmachinist of the XLFORUM http://xlforum.net/forums/showpost.php?p=1361935&postcount=1)) \\ | {{:techtalk:ref:carb:38mm_mikuni_vm_pic_1_by_sturgmachinist.jpg?direct&300|}} ((photo by sturgmachinist of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/54836-need-help-identifying-mikuni-carb?postcount=1#post1361935)) {{:techtalk:ref:carb:38mm_mikuni_vm_pic_2_by_sturgmachinist.jpg?direct&300|}} ((photo by sturgmachinist of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/54836-need-help-identifying-mikuni-carb?postcount=1#post1361935)) \\ |
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| Here is another VM-38. \\ | Here is another VM-38. \\ |
| {{:techtalk:ref:carb:vm-38_pic_1_by_donw.jpg?direct&300|}} ((photo by DonW of the XLFORUM http://xlforum.net/forums/showpost.php?p=3984744&postcount=1)) {{:techtalk:ref:carb:vm-38_pic_2_by_donw.jpg?direct&300|}} ((photo by DonW of the XLFORUM http://xlforum.net/forums/showpost.php?p=3984744&postcount=1)) \\ | {{:techtalk:ref:carb:vm-38_pic_1_by_donw.jpg?direct&300|}} ((photo by DonW of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/136579-mikuni-vm38-branch-manifold-magneto-clearance?postcount=1#post3984744)) {{:techtalk:ref:carb:vm-38_pic_2_by_donw.jpg?direct&300|}} ((photo by DonW of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/136579-mikuni-vm38-branch-manifold-magneto-clearance?postcount=1#post3984744)) \\ |
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| Mikuni VM-38 with solid mount adapter to run on a shovelhead. \\ | Mikuni VM-38 with solid mount adapter to run on a shovelhead. \\ |
| The adapter is a tight press fit with three set screws. There are threads in the adapter to run the bolts into. \\ | The adapter is a tight press fit with three set screws. There are threads in the adapter to run the bolts into. \\ |
| And there is a groove /O-ring inside the aluminum adapter bore. \\ | And there is a groove /O-ring inside the aluminum adapter bore. \\ |
| {{:techtalk:ref:carb:vm-38_pic_1_by_claysbury.jpg?direct&300|}} ((photo by claysbury of the XLFORUM http://xlforum.net/forums/showthread.php?t=1814834)) {{:techtalk:ref:carb:vm-38_pic_2_by_claysbury.jpg?direct&300|}} ((photo by claysbury of the XLFORUM http://xlforum.net/forums/showthread.php?t=1814834)) {{:techtalk:ref:carb:vm-38_pic_3_by_claysbury.jpg?direct&300|}} ((photo by claysbury of the XLFORUM http://xlforum.net/forums/showthread.php?t=1814834)) \\ | {{:techtalk:ref:carb:vm-38_pic_1_by_claysbury.jpg?direct&300|}} ((photo by claysbury of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/169173-mikuni-sticks-out-too-far?t=1814834)) {{:techtalk:ref:carb:vm-38_pic_2_by_claysbury.jpg?direct&300|}} ((photo by claysbury of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/169173-mikuni-sticks-out-too-far?t=1814834)) {{:techtalk:ref:carb:vm-38_pic_3_by_claysbury.jpg?direct&300|}} ((photo by claysbury of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-era-specific-and-model-specific/ironhead-sportster-motorcycle-talk-1957-1985/169173-mikuni-sticks-out-too-far?t=1814834)) \\ |
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| This one is stamped "X66" with the X above the 66 and one of the 6's is sideways. It also has 38F 9 on the back side just below the choke\enricher. \\ | This one is stamped "X66" with the X above the 66 and one of the 6's is sideways. It also has 38F 9 on the back side just below the choke\enricher. \\ |
| {{:techtalk:ref:carb:vm-38_pic_1_by_asasial.jpg?direct&300|}} ((photo by asasial of the XLFORUM http://xlforum.net/forums/showthread.php?t=1151844)) {{:techtalk:ref:carb:vm-38_pic_2_by_asasial.jpg?direct&300|}} ((photo by asasial of the XLFORUM http://xlforum.net/forums/showthread.php?t=1151844)) \\ | {{:techtalk:ref:carb:vm-38_pic_1_by_asasial.jpg?direct&300|}} ((photo by asasial of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/118836-mikuni-vm-my-latest-find?t=1151844)) {{:techtalk:ref:carb:vm-38_pic_2_by_asasial.jpg?direct&300|}} ((photo by asasial of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/118836-mikuni-vm-my-latest-find?t=1151844)) \\ |
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| {{:techtalk:ref:carb:vm-38_pic_3_by_asasial.jpg?direct&300|}} ((photo by asasial of the XLFORUM http://xlforum.net/forums/showthread.php?t=1151844)) {{:techtalk:ref:carb:vm-38_pic_4_by_asasial.jpg?direct&300|}} ((photo by asasial of the XLFORUM http://xlforum.net/forums/showthread.php?t=1151844)) {{:techtalk:ref:carb:vm-38_pic_5_by_asasial.jpg?direct&300|}} ((photo by asasial of the XLFORUM http://xlforum.net/forums/showthread.php?t=1151844)) \\ | {{:techtalk:ref:carb:vm-38_pic_3_by_asasial.jpg?direct&300|}} ((photo by asasial of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/118836-mikuni-vm-my-latest-find?t=1151844)) {{:techtalk:ref:carb:vm-38_pic_4_by_asasial.jpg?direct&300|}} ((photo by asasial of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/118836-mikuni-vm-my-latest-find?t=1151844)) {{:techtalk:ref:carb:vm-38_pic_5_by_asasial.jpg?direct&300|}} ((photo by asasial of the XLFORUM https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-intake-and-exhaust/sportster-motorcycle-air-intake-carburetor-efi-fuel-and-exhaust/118836-mikuni-vm-my-latest-find?t=1151844)) \\ |
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| **Fake vs Genuine Mikuni VM**: \\ | **Fake vs Genuine Mikuni VM**: \\ |
