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| - | [[:techtalk:menu|{{ :techtalk:gototechnicalmenu.jpg|}}]] | ||
| - | ====== REF: Carburetor, Intake Manifold & Exhaust ====== | ||
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| - | ====== Mikuni Aftermarket Carbs and Upgrades ====== | ||
| - | Other than exact replacement OEM carburetors, all Mikuni aftermarket carburetors and tuning components are sold "As Is" for off road / racing use only. ((http://www.mikunipower.com/VM01.htm)) \\ | ||
| - | They are not intended or approved for use on vehicles operated on public roads or in locations where applicable engine tampering and anti-pollution laws apply. \\ | ||
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| - | There are plenty of Mikuni and Keihin carburetors in the market that are not authentic. ((http://www.sudco.com/genuine_vs_fake_carburetors.html)) \\ | ||
| - | They're not safe to use and will cause many problems to your bike. \\ | ||
| - | If you're not sure if it's a genuine carburetor, the Sudco International site has a web page with pics of genuine and fake carbs. \\ | ||
| - | Follow [[http://www.sudco.com/genuine_vs_fake_carburetors.html|this link]] or you can call them directly to verify a seller. ((Sudco International Corp. 2410 S. Sequoia Drive Compton, CA 90220 Tel.(310) 637-8330 • Fax (310) 637-8331)) \\ | ||
| - | Also, below the series models below are notes from Sudco on fake vs genuine carbs. \\ | ||
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| - | ===== Sub Documents ===== | ||
| - | **HSR Series**: \\ | ||
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| - | * [[techtalk:ref:carb02b|Basic Mikuni HSR Information]] | ||
| - | * [[techtalk:ref:carb02a|Choke Relocation on a Mikuni HSR]] | ||
| - | * [[techtalk:ref:carb02e|Rebuilding a Mikuni HSR42]] | ||
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| - | **VM Series**: \\ | ||
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| - | ===== VM Series ===== | ||
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| - | ===== Sub Documents ===== | ||
| - | * [[techtalk:ref:carb02j|Function and Tuning of a Mikuni VM-38-9]] | ||
| - | * [[techtalk:ref:carb02k|Mounting a Mikuni VM-38]] | ||
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| - | These are early VM series round slide Mikunis - 34, 36, or 38 MM \\ | ||
| - | 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)) \\ | ||
| - | 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)) \\ | ||
| - | **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. \\ | ||
| - | You can call Sudco to see what they recommend for jetting after you identify which model Mikuni VM you have. \\ | ||
| - | 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)) \\ | ||
| - | 001-200....HDS-101/38mm.... Sportster/Shovelhead \\ | ||
| - | 001-204....HDS-101A/40mm.... Sportster/Shovelhead \\ | ||
| - | 001-202....HDS-101B/44mm.... Sportster/Shovelhead \\ | ||
| - | So any of these 3 sizes will work. | ||
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| - | **Considerations When Buying**: \\ | ||
| - | The Mikuni will stick out a bit further than other carbs, mainly because of the adapter. \\ | ||
| - | On a Sportster, you need to buy a throttle cable with the carb that has a 90° elbow fitting into the carb top. \\ | ||
| - | This is needed to be able to run the throttle cable under the gas tank. \\ | ||
| - | A new manifold is required along with a carb adapter or rubber boot and air cleaner mount. \\ | ||
| - | 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 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 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. \\ | ||
| - | 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. \\ | ||
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| - | 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. \\ | ||
| - | 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)) \\ | ||
| - | * Bore Size : 38mm | ||
| - | * Spigot Mount : 43mm | ||
| - | * Main Jet : 4/042 #330 | ||
| - | * Pilot Jet : VM22/210 #30 | ||
| - | * Needle Jet : #166 Q-2 | ||
| - | * Throttle Valve : VM38/24 2.5 | ||
| - | * Jet Needle : 6DP1 (the clip is set in the middle notch. That is the third notch from the top or bottom.) | ||
| - | * Needle Valve VM34/39 3.3 | ||
| - | * Air Jet : 2.0 for Sportster (002-165) \\ 0.5 (BS30/97) for BTs but reportedly works fine on a Sportster. \\ Sudco's website shows a 0.5 for the VM38-9 but the VM-38 manual says the 2.0 | ||
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| - | 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)) \\ | ||
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| - | 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)) \\ | ||
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| - | 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. \\ | ||
| - | 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)) \\ | ||
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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. \\ | ||
| - | {{: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)) \\ | ||
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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)) \\ | ||
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| - | **Fake vs Genuine Mikuni VM**: \\ | ||
| - | The fake VM carburetor has the "Minkui" imprinted on the top and side of the carburetor. \\ | ||
| - | On a genuine carburetor you will find the "Mikuni" logo. \\ | ||
| - | Also you will notice that the fake carburetor doesn't have the "NOT FOR AIRCRAFT USE" decal and the anchor plates. \\ | ||
| - | The way the fake carburetor was designed is completely different from the genuine one. There are extra openings and attachments. \\ | ||
| - | Also see this [[http://www.sudco.com/genuine_vs_fake_carburetors.html|Sudco International]] web page for pics of fake vs genuine VM carburetors. \\ | ||
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| - | ===== HS-40 ===== | ||
| - | The HS40 is a Flat slide Mikuni Carb. \\ | ||
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| - | The stamping on mouth of this one reads "T40 6W" . \\ | ||
| - | The jets included in it are in the pic to the right. \\ | ||
| - | {{:techtalk:ref:carb:mikuni_hs-40_carb_by_batousaii.jpg?direct&250|}} ((photo by Batousaii of the XLFORUM http://xlforum.net/forums/showthread.php?t=1632427)) {{:techtalk:ref:carb:mikuni_hs-40_jets_by_batousaii.jpg?direct&250|}} ((photo by Batousaii of the XLFORUM http://xlforum.net/forums/showthread.php?t=1632427)) \\ | ||
| - | |||
| - | ====== Mikuni Manuals and Other Helpful Links ====== | ||
| - | |||
| - | * [[http://www.mikunipower.com/HSR01.htm|Mikuni website (HSR page)]] | ||
| - | * [[http://www.mikuni.com/fs-carburetor.html|HSR Installation Guide]] | ||
| - | * [[http://www.mikuni.com/fs-performance_guide.html|Performance Guide]] includes: | ||
| - | * Air Cleaner Basics, Exhaust System Basics, Cam Basics and Ignition Basics | ||
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| - | * [[http://www.mikunipower.com/Manuals/HSR_SportsterBuellInstallation.pdf|Sportster / Buell Installation Instructions PDF]] | ||
| - | * [[http://www.mikunipower.com/Manuals/HSR42-48_Manual.pdf|HSR42/45/48 Tuning Manual PDF]] | ||
| - | * [[http://www.mikuni.com/pdf/how_to_choke_cable.pdf|HSR Choke Cable Installation Tips]] | ||
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| - | * [[http://www.mikunipower.com/Manuals/HS40_Manual.pdf|HS40 Tuning Manual & Parts List PDF]] | ||
| - | * [[http://www.mikunipower.com/Manuals/HS40_Manual.pdf|HS40 Tuning Manual PDF]] | ||
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| - | * [[http://www.mikunipower.com/VM01.htm|Mikuni website (VM page)]] | ||
| - | * [[http://www.mikunipower.com/Manuals/VM_Manual.pdf|VM "Round Slide" Tuning Manual]] | ||
| - | * [[http://www.mikunipower.com/Manuals/VM26_Rebuild_Kit.pdf| Rebuild Kit VM26-606 PDF]] | ||
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| - | * [[http://www.mikunipower.com/Manuals/HSR_PATInstallation.pdf| PAT Upgrade Kit Installation Instructions PDF]] | ||
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| - | * [[https://www.jetsrus.com/a_jets_by_carburetor_type/jets_mikuni_HSR_series.htm|Genuine Mikuni jets for HSR series carbs]] | ||
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| - | Video: \\ | ||
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| - | * [[https://www.youtube.com/watch?v=xm-UVTPjRbo|IronMick's VM-38 Startup Video]] | ||
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