Rd400 engine tuning book

Yamaha 400 rd rd400 engine case cases set 1976 1977 sm474 wd. Yamaha rd400 engine rebuild ii rd4 takes a trip to the coast with the bmw sr so im picking this up from the engine disaster that befell rd4 and my last post on the ensuing rebuild. From a very humble beginning, the twostroke internal combustion engine has. Available in 2 options scr performance heads in gold or polished.

I love the rd400 engine but i dont really like the stock chassis thus was born the gsxrd400 project. The model year for the first rd400, which was sold in the u. Decades have passed since i hung around with john and jim. Generator contains the most products with fiftyeight listed parts. I know that 2strokes are frowned upon in the modern age of melting ice caps, vanishing glaciers, supersized hurricanes and acid rain but if we put all of that aside for a moment, we all know that 2strokes represent a high water mark on the amount of fun its possible to have on two wheels. Anybody got a reasonable complete rd400 engine they may want to sell. These bikes also had an autolube pump for the twostroke engine, but the seller says that its been removed here. The engine, control switches, and wiring harness was used from the yamaha rd400.

The engine was vapourblasted and powdercoated before receiving a rebore, porting and jetting by martin at taymar racing who shares the building with spirit. The engine produces a maximum peak output power of 43. When i was around 14 a good friend of my dads stopped by just around dinner time on evening. There are many ways to boost the power, one of which is by installing a tuned pipe. This page contains thirtynine unique part list schematics. Say, don, doesnt one of your boys like working on motorcycles. A group for ownersfans of yamaha twostroke street bikes, especially the 1976 to 1980 rd 400. All engine development is done exclusively with tsr twostroke racing engine design software and. World of powersports decatur, il chat text email call 18773176554. The rd400 motorcycle is actually heavier than the fourstroke xs360d and is as heavy as the honda hawk type i the kickstartonly. This is a common problem with mildly tuned rd400 engines so brian had quite a problem. He converted it into a drag bike, modified the engine completely and added mikuni carbs. Suzuki made the gs500 from 1989 to about 2009 with 37mm forks, monoshock suspension, 17inch wheels, and a steel box section perimeter frame.

Jimmy carter struggles with a hostage crisis in iran. Have spoken to a guy and he has one for sale but the engine number starts. I got books on 2stroke tuning, scoured libraries, bookshops. This motorcycle also had it reigns on and off the track. A full engine overhaul was required and this was off course the right opportunity to make some modifications to things like the transfer ports, timing of the ports, shape of the cylinder heads. John and i worked for the same corporation and i found a 500 triple kawasaki for him at a reasonable price. This book explains how the efi system determines engine operation and how the calibrator can change the controlling parameters to optimize actual engine performance. Turn signal light lens for yamaha xt 250 500 dt125 175 100 400 tx xs 500 650 750. Terry mcgean hemmings muscle machines 20070401 if you are willing to spend the time learning the technology this will be a great book for your library. I wanted to bring the rd400 drag bike, in its last incarnation, over to the states. It is more like a tuned four stroke on the road with usable power from quite low engine speeds.

Follow the completion of my yamaha rd400 rebuild, project rd400 racer. Sold as a set of 2 heads with precision ground washers. Well, i had a long 6year thread here about building and developing an rd400 race engine for ahrma f50066. Please take best advantage of these yamaha rd400 1977 usa parts lists they often contain vital information for carrying out repairs on the rd400. Tuning and jetting mikuni carbs the vintage bike builder. If the engine has been recently run, the heat from the engine allows fuel in the carb to vaporize quickly. The yamaha rd 400 model is a classic bike manufactured by yamaha. Yamaha rd400 performance cylinder heads, rhsc400 hvccycle. To cope with the extra power the clutch had to be beefed up. Yamaha rd 400 technical specifications ultimate specs. The rd400 has one of those simple looking engines that cry out for serious tuning attention. Yamahas sizzling rd400 daytona special was almost the final chapter in roadgoing twostrokes. They are so simple and fun that ive always enjoyed tinkering with them.

Not the sort like when you take your rd400 to be motd and the mechanic says to you i used to have 250 when they first came out. Steel worker, gary shipley has one big regret, and parting with his beloved rd400e is it. It was great, i used to be doing 80 in 5th and itd pull a wheelie when i opened the throttle up there is no mystery to that the guy is a fruitcake, spent too much time sniffing exhaust fumes. Free shipping on many items browse your favorite brands. 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. The chassis handles great but they came with a fourstroke 500cc twin. Advanced tuning, author and calibration engineer greg banish provides the reader with the insight required to understand and tune modern efi systems. The piston crown opens and closes the exhaust and transfer ports.

Keep your motorcycle in tiptop shape by performing some basic maintenance replace worn spark plugs and the clutch kit for a nobog, instant. My name is ed erlenbach, im a private tuner specializing in yamaha rd and tz performance in southern california. Turning a 1970s era yamaha rd400 into a streetfighter cafe racer hybrid. Let us know what you think, just sign up for a free account, leave a comment and get involved. 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. Not all engines are created equal and there has to be a reason why one is better than the other. Yamaha keeping its twostroke king of the hill claim to fame until 1979 when the factory production street twostroke journey came to its end. These exploded views give you insight on which spareparts you should probably replace. It is my hope that this book will assist the enthusiast involved in motocross. Pjme motorcycle engineers, 2 stroke engine specialist aprilia cagiva. Always stored in a heated garage as part of a collection. Yamaha rd400 motorcycle parts offers thousands of yamaha rd400 parts to repair or restore your yamaha rd400 to original factory condition and increase its resale value. Martin is a specialist in yamaha 2stroke restorations ever since racing and tuning lc350s at nearby brands hatch way back when.

Yamaha created the 398cc rd400 out of the already impressive rd350 by lengthening the stroke 8mm, the 64mm x 62mm reed valve twin still fed by a pair of 28mm mikuni carbs. 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. Im running unipods and dg chambers on my ds7 250 with no trouble. Minute internal modifications appear in the parts books of each new indy, but. Our tuneup included resetting the ignition timing to the specified 2. The rd400 is about 25 pounds heavier than an rd350 but the 400 engine is only about five pounds heavier than the 350 engine. The morbidelli 125 twin road racer is a rotary valve engine. But, if the engine is cold, the fuel wont easily vaporize and it has to be enriched with more fuel than normal that is the purpose of the choke circuit on the mikuni round slide carburetor.

It evolved directly from the yamaha rd350 the 350 evolved into the rd400c in 1976, the d and e in 7879 and the final model, the white 1979 rd400f. Its the way the twostroke engine delivers its power that separates the rd400. In this version sold from year 1978, the dry weight is and it is equiped with a twin, twostroke motor. The way a two stroke motor works causes them to be f. In this very high state of tune the engine is remarkably flexible and easy to drive, as brian says. With a sixspeed gearbox the engine provided deceptive power over a wide rev range.

Hitting the open road on your yamaha rd400 means freedom, exhilaration and an escape from the daily grind. Not only will the bottom end power be improved, but the peak power goes up also. The best way to set the timing is with a dial indicator. Generator contains sixtyone products for this rd400 1976 usa.

Having started his biking career at the age of sixteen, as so many others did, on a yamaha fs1e, gary progressed on to a 250 kwak triple and then onto a honda cb400 before leaping at the stroker twin, buying the aircooled yam in october 1980, a good few months after the new boy lc was launched. Looking for 1976 rd400 tuning advice adventure rider. Dg heads, starburst heads, ottco heads, or radial heads. The engine starts and runs fine, but the bike does not come smoothly on to the pipe. The yamaha rd 400 is a noisy, polluting, unreliable motorcycle.