The choke mechanism on an su carburettor usually also incorporates a system for holding the throttle plate slightly open to raise the engines idling speed and prevent stalling at low speeds due to the rich mixture. Comments on su hs4 carburetor tuning did you find this article useful. Before resorting to the quick and makeshift solution of lowering the needle in the piston, examine the sketch. A mixture adjusting screw in a carburetor for regulating the fuel efflux during engine idling is provided in which the end needle portion of the screw is located in the idle port of the carburetor and a spring is loaded around the rod portion of the screw to hold the screw in position after adjustment so as to maintain its proper adjustment. The carburetor, and with it the engine, will no longer work if the membrane develops a leak, and the piston can no longer move up. No rubber diaphragm is fitted to an su, only similar strombergs and pierburgs. Hs2 hs4 and hs6 carburetter dismantling su carburetters. We are the worlds sole manufacturer of genuine su carburettors, fuel pumps and spares. Serious injury, death and property damage can result from the improper use, control alteration or maintenance of motorcycles. Unfortunately, following discussions with many people, the operational principles of this carburettor appear to be poorly understood. Su carburetors informative article and video explain how su. May 3, 2000 after installing a rebuild kit in an su carburetor especially an hseries it is sometimes impossible to achieve a sufficiently lean mixture by manipulation of the mixture adjusting nut alone.
The most famous and most often copied high mileage carburetor in history. Read at a joint meeting with the institution of mechanical. Idle adjusting screw in carburetor aisan industry co. Su dashpots available as highly polished or original dull shine steel linkage replated and polished. Do you have a question or comment about this article. The dealer and dealers customers must exercise good judgment in the use, control, alteration, part selection and installation, and maintenance of motorcycles. Strombergs with brass shafts receive new shafts and bushings. Su carburetters are the worlds sole manufacturer of genuine su carburettors, fuel pumps and spares. Enter your email address in the box below to subscribe. Making it work right requires things like checking for throttle shaft wear, bent needle, jet centering, free movement of the dashpot, proper mixture adjustment, and balanced adjustment of mixture and linkage adjustment of multiple carbs. Before tuning the carburettor, carry out all the checks in checking and. All su carburetors include new throttle shafts and bushings.
Unlike other types of carburettor, which have fixed jets, the su has only one jet, so the mixture setting affects the engine throughout its speed range. The design of the su carb is straightforward and is not complicated to work on. Burlen continues to supply this service to vintage and classic car and motorcycle owners across the globe, and proudly so. Whether you have a temperature compensated hif series, the popular hs series, big bore hd8s, or an. Follow us on facebook follow us on instgram view our rss feeds. Part 1 chapter 2 and part 2 type h, haynes publishing. With our online resources, you can find aisan carburetor manual or just about any type of.
Remove the piston damper 1 and its washer 2, if fitted. It is not the aim of this article to present a technical thesis on the s. Looking for downloadable 3d printing models, designs, and cad files. If the unit is held up to the light with the eye viewing.
Leave a rating or a comment below, and get instant reply notification via email if you have a long question, or a question not directly related to this article, please start a new topic in the discussion forums. Su hs6 carburetor needles used on volvo b18 and b20 engines. The piston is machined to a close tolerance fit to the dashpot housing. The workshop manual has a wealth of information on all the various styles of su carburetors.
The picture with the su in three positions is an htype carburettor. Although written for a datsun, it still applies to any su carburetor installation. Su carburetors owners workshop manual by don peers. The first fish carburetor was handbuilt in 1933 and tested by ford motor co 1934. The float chamber was bolted sideways to the carburettor body. Carburetor carburetors in general are constant choke type. If you are adjusting an existing carburetor or set. Identifying your carburettor by model and needle by marking.
Adjustment of these is described in adjusting an emissioncontrol carburettor. Tuning su carburetters including full needle charts triumph. A variable choke orifice is obtained in the su carburetter by the vertical movement of a. It could be bolted to the left or to the right side. The beauty of the su lies in its simplicity and lack of multiple jets and ease of adjustment. Replacing the needle in an su carburetor with a thinner one will result in a richer fuelair mixture. Twin sus are straightforward to set up, with three main areas of adjustment. This web page on the hitachisu carburetor is copied from a service manual for. Basic knowledge even though the su carburetor carb is a very basic yet precise instrument, some fundamental understanding on just how it works is needed to be able to deal with common problems and tuning. Join the grabcad community today to gain access and download. Following is as basic a description of whats going on that i can manage.
With a felttipped marker, mark a line where the dashpots piston chamber meets the carb body. Carburetor a diagrammatic view of the carter downdraught type carburetor is shown. Su carburettors are a brand of carburettor of the constantdepression type. Carburettor service data su carburettors index su carburettors main index. If the engine is running reasonably well you may skip these first steps. If you are having problems or if the car has sat for a long time first set the carbs to a base line. Waterchoke strombergs receive shaftsbushings as needed. You will be glad to know that right now aisan carburetor manual pdf is available on our online library. Su carburettors how su carburetors work mini mania. Edit in html format click on a part number to perform a search for more information regarding that part please be aware that some items displayed in this listing may be discontinued and no longer available. The h horizontal su carburettor is one the most used carburettors on british cars in the early fifties. First you need to be comfortable with the main aim of any carb to supply the engine with a finely atomized fuel. Some sus also have exhaust emissioncontrol devices to comply with antipollution laws. As you can see from the picture, the kd needle provides the richest mixture, and the zh the leanest.
Over the years burlen has become renowned for its role in manufacturing, restoring and reintroducing a number of famous classic vehicle fuel systems and associated spares including su, amal, zenith, stromberg and solex. Adjusting your carburetors extracted from earlier articles by scott fisher, roger garnett, ken streeter, and other contributors. This is a set of su tuning tools, for setting up su carburetors. The grabcad library offers millions of free cad designs, cad files, and 3d models. Aisan carburetor manual pdf aisan carburetor manual pdf are you looking for ebook aisan carburetor manual pdf.
Gasket carburetor carburetor wt80 walbro carburetor ciuhi 1 zama box air filter decal chokerun screw thread forming air filter cover air filter screw thread forming 816 x 34. Su reference catalogue 16th edition as 2012 burlen fuel systems ltd the. Su polished kit any model estimated price please call for current price and availability. The vast majority of modem spark ignition internal combustion engines rely upon carburetters to provide them with the finely atomized fuelair mixture which is necessary to enable them to perform satisfactorily. Please use our product search boxes below to find your carburettor, fuel pump or spare part for your vehicle or have a look around our store to find a range of accessories to fill your needs. Carburetor installation and tuning ultima products. The hitachi su carb page requires acrobat reader for pdf files.
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