Ypvs engine tuning book

Engine 1983 yamaha 350lc ypvs, dick sullivan race tuned cylinders and head, dick sullivan modified gearbox, wossner pistons, heavy duty gearbox bearings, billet power valves, banshee crank, straight cut primary gears, billet clutch basket, vforce reeds and reed blocks, 34mm tz race mikuni carburettors, oversize tz hicapacity radiator, samco water hoses. The ypvs engine is fairly long, so most of the 250cc type vtwin chassis are too short, as we know from experience. Do not start to widen the intake and exhaust port at first. Other books to his credit are modern engine tuning, twostroke performance tuning and forced induction performance tuning. Ypvs engine rebuilder advice the rd lc crazy uk 2 stroke forum. It is my hope to provide you with the best engine and performance youre looking for. Designing and tuning highperformance fuel injection systems banish, greg on. Take care, that right protective measures are taken. This is the most comprehensive efi tuning and calibration book available and that is why it has sold in 36 countries worldwide and is used as the efi tuning text book by technical schools such as school of automotive machinists and studied by students at lincoln tech and. Yamaha rd350 ypvs twins 83 95 by haynes publishing.

Front brakes ap lockheed race caliper with tz disk and stock yamaha cylinder. I would however like to tune the engine a bit in the future when ive got a bit more money to spare. In addition, we offer a carefully compiled list of all the wearing parts, addons and accessories available in our range specifically for your yamaha rd 350 lc ypvs 31k. Engine 1976 yamaha rd250ac, mick abbey race tune ported cylinders and head profile, stock mikuni 28mm carbs, stock reed blocks with fibre glass reed valves. Pro design billet manifold set rz350banshee 3035mm carbs view details. This book explains how the efi system determines engine operation and how the calibrator can change the controlling parameters to optimize actual engine performance. A popular modification, particularly to the ypvs model, the spacers fit between the reed cage and the cylinder to space the cage back. Yamaha rd350lc, rd350 ypvs, dt125r, rd500 motorcycle parts. View and download yamaha yz250v owners service manual online. Designing and tuning highperformance fuel injection. Yamaha rd350lc cylinder big bore tuningkit big bore 392ccm cylinder 392cc kit for. The motor bookstore carries a wide selection of engine building books designed to guide you through the process with detailed procedures and clear photographs ideal for any diy home mechanic.

Integrated ypvs and loads of power in a lightweight package the rz350 packed a serious punch against many of its bigger cc brothers. The engine in the yamaha rd 350 ypvs is a very robust construction. Have a look at the following blueprint rebuild and phases. The tzr 250 did carry on the embodiment of the early ypvs, but the miniature engine was a completely fresh design with more in common, parts wise, with the rd500lc than the 350 twin. Knowledge is power and whether you are tuning your car yourself, wanting to start a career as a professional tuner or even if you are just wanting to choose and communicate.

The chapters are well planned and contain a wealth of detail, tables, and calculation methods. When discussing highperformance automotive engines, a specific set of math formulas are used to develop and design power plants to make more power at higher rpm levels and still survive. Decades have passed since i hung around with john and jim. Gain fundamental knowledge and then a practical step by step process for getting any tuning job done. Bike socials secondhand bike buying and selling expert makes his choice for this weeks selection of the good, the bad and the ugly from the classifieds. Nov 15, 20 road and dirt performance bike parts unit 4 the sidings, leeds road, windhill, shipley, bradford bd18 1bn please call in and see us 8 a. This reduces the ignition advance required to get complete combustion, which reduces the powerrobbing part of the engine cycle just like we wanted. Note that there is a fairing part missing, the lateral fairing covers, which have been removed one problem i have is that the cdi unit was missing. Lets journey back to 1973 and read the book that was the two stroke bible of that era. Tuning buch rd350 alias rdbibel neues testament muster. How to tune and modify motorcycle engine management systems addresses all of a modern motorcycle s engine control systems and tells you how to get the most out of today s bikes. One of the best, competition winner 2 stroke tuner, lambrettas, rd350 ypvs with 521cc kits.

The goal here is for the educated enthusiast, skilled technician, and automotive engineer alike to all be able to come away with something. This kit is made in italy by athena and is a better quality one than the budget one we sell which is made in taiwan. Yamaha rd 350 ypvs yamaha rd350 ypvs is a motorcycle. Lambretta works lowestoft 2 stroke tuning services. This engine was dynod in excess of 50hp, compared to my x7 at a mere 44hp so its definitely got the poke. The 250lc carbs will give more midrange then 350 or ypvs carbs, worth remembering if your tune is for midrange. Contents chapter 1 introduction 9 chapter 2 the cylinder. Two stroke performance tuning a disc partially cut away and attached to the end of the crankshaft opens and closes an inlet port in the side of the crankcase. Yamaha rd 350 ypvs and yamaha rd 500 v4 together duration. Apr 29, 2012 and, just as the bikes themselves have changed, so have the tools with which we tune them. Tuneup procedures engine, clutch and transmission repair cooling.

Yz250 t, yz250 t1, yz 250 2005, yz 250 t 2005, yz 250 t1 2005. How fuel injection works aftermarket fuel injection. Rd250350lc ypvs all models ypvs engine in rd250350lc chassis. Even with the great success of the winning banshee engines the rz still has a huge following. May 30, 2018 designing and tuning highperformance fuel injection system by greg banish and performance fuel injection systems hp1557. Yamaha rd350lc ypvs by phil westget other yamaha motorbike repair manuals herethe rd350lc ypvs family of watercooled racederived twostroke screamers has become a motorcycling icon of the 1980s. The chambers is the single most important thing when it comes to tuning the 2stroke engine. The theoretical 100% filling of a fourstroke engine with a 300 cubic inch displacement operating at rpm is calculated by. Learn how to tune efi electronic fuel injected engines the right way. So we are a onestop shop where you can get all the information you need and the right product quickly and easily. Wp has tuned several of these little monsters to incredible levels. Result power boost is about 200 rpm earlier max 5% more power the extension of the outlet is often hailed as the most important measure.

Forced induction performance tuning a practical guide to. Tracy martin is the author of five motorbooks workshop series books, including, how to use automotive diagnostic scanners, how to diagnose and repair automotive electrical systems, motorcycle electrical systems troubleshooting and repair, how to tune and modify motorcycle engine management systems, and how to troubleshoot, repair and modify motorcycle electrical systems. Yamaha rd350 ypvs top end gasket kit athena top end gasket kit for the yamaha rd350 ypvs, fits all years f1,f2 31k 1ua etc. Yamaha rd tzr dt 125 250 350 zweitakter twostroker twostroke tuning. The tz dry clutch and gearbox fits in with little trouble. View and download yamaha yz250 owners service manual online.

This air consumption is used by the pcm to calculate engine load. Cheers bud, but thats the spec for the lc and not the ypvs. A reference to two books written on the topic of 2 strokes by gordon. The yamaha rz350 was a twostroke motorcycle produced by japanese motorcycle manufacturer yamaha between 1983 and 1995. The test of the book is written at such a level that it will allow people with little knowledge of the aseries engines and engine tuning to develop and grow their skills, while still being able to maintain the interest of those but probably the most expert engine builders to find interesting, ideas, techniques and technical information on. Complete bike build and design a speciality, if you can dream it we can probably build it. Carbon hochleistungsmembrane tuning stage 2 racing speziell fur yamaha rd 350 lc ypvs yfz 350 banshee. Building your own racing expansion chambers rdrz 350 ypvs why should i even bother making them.

What are some good books on tuning engines for performance. Yamaha engineers realized that by altering the height of the exhaust port they could effectively change the engine power delivery thereby having optimal power and torque across the entire rev range, so it was that the ypvs was born. This means that the mixture in the combustion chamber is nearer to the spark, and the flame spreads through it quicker. The rz was the final evolution of the popular and wellknown series of rd yamaha motorcycles, and as such is also known as the rd350lc ii or rd350 ypvs it was powered by a twincarburetted reed valve inducted, liquidcooled, 347 cc paralleltwin twostroke engine, with a. Select your language tuning yamaha rd 250 350 lc ypvs. The standard gearbox is fine with 3 tz 750 clutch springs thats all i do. Renowned for smoothing the midrange performance and removing flat spots normally associated when tuning work is carried out. I didnt want to take it back unbuilt in case he just sent back some old crap bits he had laying aroundnow i just build them myself, quite easy to rebuild and you know what. The engine wp started with still dominates the majority of our business.

Frame standard yamaha rd frame and swingarm, lightened and delugged. Automotive tech books from sa design are a great way to pick up the knowledge you need to build or work on any number of performance cars and hot rods. Floydy racing two stroke tuning john floyd posts facebook. A fourstroke engine has two revolutions per cycle of displacement, so the displacement rate is onehalf of actual engine speed. Yamaha rd350 ypvs 8395 haynes repair manuals haynes on amazon. Engine tuning is the adjustment or modification of the internal combustion engine or engine control unit ecu to yield optimal performance and increase the engine s power output, economy, or durability. Since as ever i wanted to do this engine right, i decided that i had to engineer a proper solution to get the outlet to run up at 90 degrees to how it was exworks, and it had to be done in a small amount of space.

I havent ever considered putting a different engine in the tdr, ive also seen the beginnings of someone putting an rg500 engine in a tdr. This partslist page carburetor contains the most products with sixtyeight listed parts. Much more important are the measures below the piston. Substantial data collection is required to evaluate an engine, more if a simulation is to be performed. A worked example is provided for my old yamaha rz350 29k, 1985, which is almost identical to he yamaha rd350ypvs lcii 31k. The piston crown opens and closes the exhaust and transfer ports. How to design, build, modify, and tune efi and ecu systems. All the parts within any engine are designed and engineered using the appropriate mathematics to function efficiently and be durable.

All engine development is done exclusively with tsr twostroke racing engine design software and vannik developments two stroke engine simulation software. Front engine mount rubber damper to fit the yamaha rd350 ypvs and the yamaha rd350 lc all years genuine yamaha part number 2gu1531600 and 4l01531600 these get hard with age, and usually get destroyed if you have your cases powder coated. All tuning and road and race prep engine rebuilds available. The yamaha rd350 f2 was an updated version of the yamaha rd350 f faired ypvs model. Building your own racing expansion chambers rdrz 350 ypvs. Owned by tommy from sweden and tuned by mick abbey from the uk, this 350 ypvs puts out 77bhp at the rear wheel. Specializing in engine frame transplant 2 stroke race reps eg. He converted it into a drag bike, modified the engine completely and added mikuni carbs. It was the first massproduction bike to use now commonplace monoshock rear suspension and in racing it instantly became the production racer of choice. Available individually or as kits for the rd250350lc models. Before this book even begins, i wish to make it perfectly clear that this is not an engine design or combustion theory text. Available in various sizes,6mm aluminium being the most popular.

He told me loads of stuff was knackered and in the end i couldnt afford to get any tuning done. Wicked motorsport ignition cover black edition for yamaha rd350 ypvs banshee. Originally it produces 4750 bhp all bhp figures on this site are rear wheel figures unless other is written, and with some simple modifications that i will describe on this site when i get the time you can raise that to 5565 bhp. A meeting place to swap photos, information and stories about the yamaha rd350 86 rd350 ypvs. Modern engine tuning achieves this end, and presents engine tuning as an art as well as a science. The procedures used to evaluate this engine can be applied to any 2 stroke engine you wish to evaluate. How to tune and modify motorcycle engine management systems. In the ypvs engine, the combustion chamber is narrower than the piston. If you set the pvs up wrong you wont kill your engine, it just wont run 100%. This unmasks the intake boost port and gives an improvement in engine performance and smoothness on the throttle. Yamaha built their setup dowel pin using production parts with tolerances. Everyday low prices and free delivery on eligible orders. Plus, the same chassis is used in the tzr125 and the szr660, so availability is reasonable.

Design and manufacture of the finest bespoke, handcrafted pipes in mild steel, stainless steel or titanium. Without a pair of really good chambers you will never get much power from you rd 350 ypvs. Note that there is a fairing part missing, the lateral fairing covers, which have been removed to open the engine. In the end, the yamaha tzr250 3ma chassis fit the bill perfectly. Membrane carbon yamaha rd 350 yfz 350 banshee, stage 2. Ecu book, ecu repair, ecu repair manual, ecu mapping, ecu tuning training, winols training, ecu block diagrams, edc17 repair manual, ecu repair training, ecu immo off services, airbag clear services, egr remove services, dpf remove services, dtc remo. On the oem ypvs and lc engines there is a thermostat housing setup built into the top of the oem head, and the outlet from that exits straight up.

Yamaha rd350 ypvs 8395 haynes repair manuals haynes on. If you mill inlets and outlets of the barrel, absolutely used eye and respiratory protection. Find practical methods on how to blueprint an engine, or. Engine 1983 yamaha 350lc ypvs, dick sullivan race tuned cylinders and head. John and i worked for the same corporation and i found a 500 triple kawasaki for him at a reasonable price.

Datalogging of the engine sensor data during a wide open throttle run reveals the actual air consumption. The morbidelli 125 twin road racer is a rotary valve engine. The various forms of motorsport and street use all have different. Membrane carbon yamaha rd 350 lc ypvs yfz 350 banshee, stage 2 racing. The inlet port opens 30 after bdc and closes 79 after tdc. If searched for a book yamaha ypvs parts manual in pdf format, then youve come to correct website. The twostroke power valve system is an improvement to a conventional twostroke engine that gives a high power output over a wider rpm range. Notice how this naturally aspirated engine develops approximately 86% engine load at wot.

Honda ns400r engine parts, tuning our products sort by date newest to oldest oldest to newest sort by price highest to. You may read yamaha ypvs parts manual online either load. Graham bell is an acknowledged expert on engine tuning, with many years experience in this field. Tuning of an rd 250 350 twostroke engine 7386 tuning. Tuning engines can be a mysterious art, all engines need a precise balance of fuel, air, and timing in order to reach their true performance potential. It is my hope that this book will assist the enthusiast involved in motocross, enduro, desert, road or gokart racing to develop and tune his twostroke engine for. Hey, we managed a first place trophy winners on 20th june 2019. The rz350 1984 e usa parts lists can also be referred to as. Designing and tuning highperformance fuel injection systems. We furnish utter variation of this ebook in txt, pdf, djvu, doc, epub formats.

It is a musthave for tuners and calibrators and a valuable resource for anyone who wants to. Here you have some close pictures of the damage its engine. The end of japanese production in 1992 saw the type re hashed and manufactured in brazil, all parts still fit but as previously mentioned build quality leaves a. Advanced tuning takes enginetuning techniques to the next level. Rd421 ypvs engine high flow tune destined for a lambretta though you guys would enjoy. Noteworthy are the chapters on cooling, exhaust and the ignition system. Twostroke power valve system news newspapers books. Full carbon bodywork set, racing stepkit all tyga products. Keith knows his rds inside out and has no issues rebuilding his own engines so is able to keep on top of the little 250 with some tuning dyno help from mick abbey. While it is a popular misconception, even if they turn 360 degrees the pvs wont hit the pistons. These bottles are dyno proven to improve performance. Rebuilding or replacing an engine can seem like a daunting task without the proper resources. This software packages may also be available on the internet as the first book is quite old.

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