Tuning your carburetor after instaling after market parts is essential for maintaining optimum performance. Any guesses if this will work ok out of the box or need some changes. Genuine mikuni parts properly replace worn or mistreated components for hsr4245 carburetors includes top cover gasket, jet needle ering and washer, throttle valve seal, pilot air oring, fuel joint oring, accelerator pump oring, needle valve oring, needle valve retainer screw, needle valve assembly, float bowl oringgasket, overflow hose, float bowl screws, accelerator pump rod boot. Tm1 your mikuni hsr is fitted with the tuning parts we found to work with. If the engine changes from its steady idle, if it surges or misses, then there is an air leak that should be corrected. The list of parts shown is specific to the carburetor listed, and should not be assumed to fit similar models, especially older ca. Be sure to keep the spray away from the air cleaner to avoid a false indication. Mikuni hsr42 smoothbore carburetor easy kit 4218 harley. Mikuni carburetors should be replaced, repaired or tuned by the selling dealer, or a trained or qualified race mechanic.
Additionally, it works with a 44mm air filter and improves throttle response. The numbers 42, 45, and 48 indicate the bore size at the engine end, 42 mm, 45 mm, and 48 mm respectively. Jan 23, 2002 all procedures in this manual should be followed, paying particular attention to the following. Harley davidson carburettor conversion mikuni hsr42 also. The unique thing about mikuni carburetors is that they are manufactured in japan and consequently used in kawasaki, honda, yamaha and other japanese motorcycles. Install the new assembly into the mikuni carburetor. Eviltyrant the completely evil blog blog archive joe. This carb works with a honda xrcrf engine ranging from 100cc, 200cc and 250 cc. Feb 10, 2003 tuning the hsr424548 carburetors eagle parts as a reality check.
Jul 05, 2017 mikuni hsr series carburetors are used in harleydavidsons and american big twins. Kipa choke cable for mikuni hsr42 hsr45 hsr48 carburetor, fits for harley davidson hd hsr cv carburetor, oem part number 426232, 990662002, n189. This is the position we have found to be correct most of the time. May 06, 2018 the kit is called the mikuni mileage kit and there are separate kits for the hsr42 and 45 carburetors because the needles are different. Its purpose is to provide maximum airflow for the most demanding high performance engines. If the screw position has been altered, gently bottom it and reopen it two full turns. The first is that it drastically improves throttle response. Hsr42mikuni tm42 exploded view replacement parts listing. Shop our complete selection of harleydavidson motorcycle parts and accessories including the mikuni hsr42 smoothbore carburetor easy kit 4218. Be aware that stock cables will not work on this carb. When retuning is required, it usually involves small alterations to the idle andor main system.
In this video, i finally get a popular requested video done. New carburetor rebuild kit for mikuni same as khs016 for hsr42 or 45 motorcycle carbs 100% brand new and high quality. Mikuni hsr series carburetors require the use of a pushpull throttle assembly to assure positive closing of the throttle valve. This mikuni manual details methods of tuning mikuni hsr 42 45 48 carbs to match after market parts that may be fitted. Khs020 to mount hsr4245 carb and filter to evo big twins, includes the new chrome banjos, vent bolts and brackets. Mikuni hsr42 hsr45 hsr48 hsr 42 45 48 series carburetor carb tuning manual here. The amount of power any engine can deliver is directly related to the volume of air it can use in a given time together with its efficiency in using that air. Mikuni carb hsr 424548 smoothbore carburetors also provide highly accurate fuel metering, more power, and mikuni s renowned precision throttle response. May 10, 2000 the hsr42 carburetor is divided into four interdependent systems. Khs030 to mount hsr4245 carb and filter to twin cam engine, includes the new chrome banjos, vent bolts and brackets. Harley davidson carburettor conversion mikuni hsr42 also up. While there may be some overlap, each system can generally be treated as though it is.
Today i tried to set the pilot air screw in mikuni hsr42. Final settings on the carb for above build is 50 acc pump jet, standard 97 needle with clip in stock position centre groove 165 main jet on main jet extender and idle mixture screw set at 2 14 turns out. Hsr easy kit installation instructions mikuni carburetors. Diagram showing the effective range of the each tuning component of the mikuni hs40 carburetor idle circuit pilot system the idle circuit supplies fuel at idle speeds and has a major influence on fuel flow up to 14 throttle.
The mikuni hsr tuning manual helps make jetting alterations and adjustments. Sudco mikuni tuning manual newest 5th edition carb book ebay. Mikuni hsr42 carb tm426 for the performance engine builder needing the carburetor only for specific custom applications. Jan 22, 2010 hey, ordered a mikuni easykit and vance big radius 2 into 1 to put on my 98 fatboy. I purchased a set of mikuni hsr42 carburetors from bonneville performance in 2014. The mikuni hsr tuning manual helps make jetting alterations and adjustments an easy matter. Liangcha0401 carb carburetor repair rebuild kit compatible for mikuni hsr 42 45 hsr42 hsr45 factory supply acarte carburetor carbon dirt jet cleaner tool kit 10 cleaning needles with 5 brushes 4. The kits come with simple installation and tuning instructions. How to setup the mikuni hsr series flatslide carburetor. Hsr 48 is the preferred one for racing motorcycles. Vintage performance developments performance products. The following pages supply enough information to make such alterations relatively simple. Yep i read the manual and the hsr 40 tuning manual as well.
Genuine mikuni khs016 hsr42 hsr45 carburetor rebuild kit wfree tuning manual. The tps can be adapted to use your stock ignition, but its recommended to go with a dynatek3000 ignition unit, in. Available with california air resources board carb exemption, these versions are 50state legal for pollution controlled motor vehicles. New carburetor rebuild kit for mikuni same as khs016 for hsr 42 or 45 motorcycle carbs 100% brand new and high quality. Will fit cruise control model bikes if cruise control is not used. Hsr42tm42 parts list our mikuni parts finder may assist you in finding the replacement parts you need.
This is perhaps one of the best written book on carb tuning, just ignore the accelerator pump. Also, what does the hsr 42 come set up with as far as jets and needle. Mikuni hs40 tuning manual, exploded view and parts list figure 1. Harley davidson carburettor conversion mikuni hsr42 also up to hsr48 for all. Each hsr carburetor in the kit comes prejetted and ready to run. It seems more detailed in its explanations of things but that carb is a bit different than the hsr 42.
The mikuni carb kit was designed and intended for a 2008 bonneville twin 865cc engine to replace the stock oem keihin cvk 36 carbs that had become too restrictive due to intake and exhaust modifications to the engine. We locate and promote products from a wide range of mikuni resellers and vendors. The accelerator pump system each of these systems has its major effects in a different throttle range. Some exhaust system designs strongly interfere with carburetor tuning. Manifold clamps, seals are not included in the kit. Joe minton mikuni hsr42 setuptuning recommendations eviltyrant. Includes clear diagrams and text to help you get the best from your machine. Harley davidson mikuni hsr45 hsr42 carburettor upgrade totalkit for twin cam evo shovelplus more this is complete with manifold all breathers and fitting. Hsr series has flatslide throttle with roller bearings and accelerator pump. Kits bolt to stock intake manifolds and include an hsr42 mikuni carburetor with throttle cables, airbox adapter, a chrome air cleaner cover specially relieved to fit original equipment airboxes, and. Vintage performance developments performance products for. Please note that there is no point in attempting to tune any carburetor. Included is complete installation instructions and owners manual. Starting in 1980 in the us market anyway all gs bikes adopted mikuni bs cv carburetors.
The hsr42 carburetor is divided into four interdepen. Other than exact replacement oem carburetors, all mikuni aftermarket carburetors and tuning components are sold as is for off road racing use only and are not intended or approved for use on vehicles operated on public roads or in locations where applicable engine tampering and antipollution laws apply. Mar 01, 2020 mikuni hsr42 carb tm426 for the performance engine builder needing the carburetor only for specific custom applications. I just cant seem to get it to idle without coughing through the carb. The amount of power any engine can deliver is directly related to the volume of air it can use in a. When a mikuni carb is properly seated in a mikuni adapter, you can feel it pop in and it will often be accompanied with a clicking sound. All procedures in this manual should be followed, paying particular attention to the following. Use this page for these carbs earlier versions lh throttle. Your mikuni hsr is fitted with the tuning parts we found to. How to identify the mikuni carburetor in your motorcycle. Choke cable not included use stock choke cable from cv type carb. Kipa carburetor for mikuni hsr42 hsr 42mm fit harley evo evolution twin cam glide dyna super wide lower rider disc glide fatboy heritage softail night train road king softail roadster sportster. Every mikuni carburetor kit is an easy bolton application.
Find the mikuni hsr42 smoothbore carburetor easy kit 4218 at dennis kirk. Harley davidson mikuni hsr45 hsr42 carburettor upgrade. The 30mm carburetor fits bikes that have an engine similar to that of the honda 200 250. Dtt ignition module with initial advance set on 5 and advance curve set on 7. Mikuni hsr 42 how to set pilot air screw idle mixture. Basically the hsr 42, 45 and 48 are the same carb except for throat size and stock jetting. Mikuni hsr42 to hsr45 upgrade triumph bonneville a. Mikunihsr real world tuning tips for beginners archive. Mikuni hsr 42 45 48 carburetor tuning download manuals. Accelerate with the throttle between 10to25 percent open. Carburetors are designed with an 8roller bearing flat throttle slide assembly that allows an unobstructed venturi at full throttle to flow more air, while it mixes more precisely at all. These instructions are primarily for the dual carb kits as used on volvo 544, 1800, 122, and 140, mgbs, tr4s, etc.
Available in standard aluminum finish or the polished version. There are a number of advantages to be enjoyed from using mikuni carburetors. This mikuni hsr carburetor kit is designed to be a bolton application, and as such, is setup and jetted. Our high flow filter supports 100 horsepower with no loss from filter restriction. The high vacuum encountered, as well as dirt ingested into the carburetor when running without an air filter may hinder the throttle valve from closing. The list of parts shown is specific to the carburetor listed, and should not be assumed to fit similar models, especially older ca general.
Adjust the accelerator starting point so that the pump starts working immediately. Mikuni hsr series carburetors require the use of a pushpull throttle assembly to assure closing of the throttle valve. Tuning and jetting mikuni carbs the vintage bike builder. Replacement carburetor rebuild kit for mikuni hsr42 or 45 carbs package read more genuine genuine mikuni hsr42 hsr45 viton tip size 2. Mikuni carb kit installation and tuning instructions updated 2420. When re tuning is required, it usually involves small alterations to the idle andor main. Oct 22, 2020 may 14, 2020 mikuni carburetor manuals. Mikuni carbs have a groove cut in the spigot that fits into a raised rubber channel in the mikuni flange and straight adapters. The throttle cables should be routed freely without sharp bends between the throttle twist grip and the carburetor and. Interesting point as well the hsr 40 has pilot air jet that is tunable but on the hsr 42 i think it has a blank and no actual jet in it. Mikuni s new hsr48 is a special version of the proven hsr42 carburetor.
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