The inlet port opens 30 after bdc and closes 79 after tdc. Dongfang 125cc 4 stroke auto wreverse engine motor for 70cc. Two stroke motors are more efficient that four strokes for a few reasons. Does anyone know how to tune these engines so that its giving hp thats in the mid 20s. Most engines are fitted with exhaust manifolds that collect all the gases from a bank of cylinders. Harris performance engineering hp race development. There is no 2stroke displacement limit for our software, for example you can have a 125, 250, 500, 700 singlecylinder and our modules will work flawlessly. After that the thing will make as much power as its ever going to make really.
Tachometer is very handy and a must for a newbie or the tuning process will be very slow or painful or imperfect disclaimer. It is very important to understand that tuning a single item fitting bigger carbs, for example may not in itself improve performance but will, used in harmony with other modifications, produce the required results. Here we will discus few easy to implement scientific techniques to increase power and performance of your 4 stroke machines be it a commuter or an already sportbike. The objective of tuning is to improve the volumetric efficiency of the engine. New material on electronic fuel injection and computerized engine management systems. For every gallon of gas an engine burns a gallon of water vapor goes out the exhaust pipe. We cover that, as well as other mods on a four stroke engine. It is very important to understand that tuning a single item fitting bigger. Computer software can help you with the design, but dont expect super design from the software. Efi kit for 50cc to 110cc 1cylinder engine 28mm throttle body. Forums the tuning center maxiscooter tuning 125 4 stroke tuning dont wet the bed im not expectin much discussion in maxiscooter tuning started by nibbles, dec 10, 2008.
Exhaust and intake tuning building, tips and techniques. The owners in general pick the second option rather than the first one. With the experience or the simulation you can determine the new timings and the new maximum lift, but what remains problematic is the determination of the lift law and of the cam profile, this to maximize the volumetric efficiency and in the meantime check out the valve. Support for windows not only makes the program easier to use, but it also allows the growing number of twostroke enthusiasts to use this powerful simulation on windows. Basic 2 stroke tuning by eric gorr changing the power band of your dirt bike engine is simple when you know the basics. Those of us who have grown up in the japanese twostroke. Why proper carb tuning is critical for 2 stroke engines. On the 4 stroke, intake tuning is also a consideration. We use computer design software to maximize power and torque at any elevation. Optimization of exhaustpipe tuning on a 4stroke engine. Theres little point in going out to buy a 4 stroke with the intention of tuning if you got even half way to a 2 strokes power its going to be a hell of a lot less reliable. This is aimed at people with little or no knowledge of engines or how to tune them, ive pitched it at a very basic level, its far more an intrudction than any sort of. Most fourstroke engines, save for xr50s and ttr125s, are already at the legal. While two stroke engine development is on the rise again, the worldwide interest in a professional two stroke engine simulation is still limited.
A reference book for the enthusiast engine tuner and race engine builder. The cost to convert this program into a full windows program like our dynomation5, four stroke simulation would prevent it from ever being released. Mercury magnum dynoboost boat performance chip magnum tuning. Os91fs, saito 125, and and os200fs try leaning the low end when running around 14 throttle. How to tune your carb carburetor tuning tips and tricks. Drawing on the authors many years of experience in tuning and modifying highperformance road, rally and race units, every aspect of an engines operation is explained and analyzed. Software for fine tuning and design of four stroke engine by. Dynomationtwostroke engine simulation motion software. Buy dongfang 125cc 4 stroke auto wreverse engine motor for 70cc 90cc 110cc go kart atv. The worlds leading 2stroke engine simulation software available readytorun on your pc, at only. Hyykj 125cc 4stroke motor engine pit dirt bike atv quad kit manual clutch pz20 carburetor for kazuma baja 50cc 70cc 90cc 110cc 125cc taotao 110b nst engine 125cc 3speed semiautomatic with reverse taotao falcon atv go kart. Jan 26, 2012 the baffles collapsed in my original exhaust but my mate had this can from a 900cc and with a bit of modification to the can we were able to fit it to my scoot with succsess and she sounds not bad.
Development and modification of a single overhead camshaft 4. Although there is really no shortage of books on the subject of 2stroke tuning and preparation, i knew that an active software programme would be able to offer so much more. Cd free tuning software also downloadable categories. The header pipe is usually double or triple walled.
The technical and commercial success obtained in all sectors to allow us to develop continually the software in race racing. Ems river rescue vessel, for delivery later this year. If doo put the 1200 in a 129 g4 chassis it would be my spring check sled. The new ecu engineered by get for motorcycles model ktm rc390 and duke 125cc, 200cc, 390cc. The morbidelli 125 twin road racer is a rotary valve engine. From a 49cc racing engine, to a gp 125 engine, or a 1500 mercurial triple engine, or a 250 kart engine, racingsm software suits all. Those of us who have grown up in the japanese two stroke. The heart of our test bed is the very latest state of the art dynojet motorcycle 178 load control dynanometer with torque module for real time power results. If your adventure brings you through the colorado springs area, stop by our showroom and warehouse anytime.
They are so simple and fun that ive always enjoyed tinkering with them. The software uses mathematical formulas that are approximations of reality, and the. Tuning your carburetor for optimal performance and fuel. Two stroke performance tuning chapter 3 porting and cylinder scavenging today, when we take a look down the cylinder of a twostroke engine, we find its walls literally filled with ports to handle the induction, transfer and exhaust phases of gas flow through the engine. Mar 12, 2008 hi, im looking at buying a nice little 4 stroke for my first bike just to act as a commuter and to get my experience up. Improper 2stroke carburetor tuning will have a much more significant effect on a 2stroke engine than a 4stroke because the premixed oil lubricates the crankshaft. Improper 2 stroke carburetor tuning will have a much more significant effect on a 2 stroke engine than a 4 stroke because the premixed oil lubricates the crankshaft. Yz250, ktm 125, ktm150, ktm250, ktm300, and pwk called short body. On page 51 gordon uses the term onepercenter, the term refers to an american motorcyclist association quote that 99% of motorcyclists were lawabiding. Read this document before reading the applicable tuning section for those controllers, which are here. Whatever the tuning needs are for your bike daytuner are more than qualified and experienced enough to do it. Thought id better kick the new section off by writing an article for it myself, on the subject of 4 stroke engine tuning, no specific to minis, but all totally relevant. Check out our highquality selection of engine parts and get your dirt bike tricked out today.
Basic concept of tuning a 4 stroke petrol engine the. The is an introduction to tuning with a programmable electronic fuel injection ecu. This is so the chrome on the outside pipe will not get hot and turn colors. Dec 10, 2008 125 4 stroke tuning dont wet the bed im not expectin much. One of the main actions of preparation and development of a 4 stroke engine consists in the modification of the camshaft. Usb adaptor included, usb connectivity, and no more rs232 port needed 12. The problem is that if i were to get a 125cc 4 stroke it would be barely kicking out more power than my old aprilia rs50, which was tuned to the point it did 80mph. To stroke an engine, a tuner relocates the bigend bearing further. Two stroke performance tuning chapter 3 porting and cylinder scavenging today, when we take a look down the cylinder of a two stroke engine, we find its walls literally filled with ports to handle the induction, transfer and exhaust phases of gas flow through the engine. Graham bell is an acknowledged expert on engine tuning, with many years experience in this field. The new programmable ecu by get for offroad fuelinjected 4stroke single cylinder batteryless engines.
Every manufacturer has some form of reprogramming software that allow. The city of pittsburgh river rescue unit selected lake assault boats to build a 30ft. Xpro 50cc 4stroke gy6 scooter engine auto wcvt transmission, electrickick hunter phantom left and right rear upper body panel 50cc150cc gy6 tms long case 150cc gy6 scooter atv gokart engine motor 150 cvt auto carb complete gy6 cylinder head rebuild kits with valves, trkimal 57. Rebuild kits free delivery possible on eligible purchases. Theres little point in going out to buy a 4 stroke with the intention of tuning if you got even half way to a 2 strokes power its going to be a hell of a lot less reliable than the 2 stroke. So, while the physics of gases in motion will apply there, tuning for the exhaust pulse will not. There are many ways to boost the power, one of which is by installing a tuned pipe. We offer trackside testing for both engine tuning and efi mapping, as well as suspension. As we all know that there are mainly three steps involved in any internal combustion engine2 stroke or 4 stroke i. A rich mixture will cause poor performance, but a lean mixture can destroy your engine over time.
A yamaha yz400, 5valve, 4 stroke cycle, motocross racing, motorcycle engine is instrumented to provide pressure diagrams in the exhaust system which are recorded over the usable engine speed range at full throttle from 5000 rpm to 1 rpm. Will it actually bring a big difference in power, or should i also change the carbu. Nmp020722 qmb 9 4 stroke chinese 50cc gy6 mrp exhaust duration. For example, a cc engine may produce 125 hp in stock form and 175 hp after race tuning. Hp is a full on specialist in ecu tuning 2 and 4 stroke, cdi development for 2 strokes, and general mapping needs. Slavens racing offers engine parts for motorcycles, dirt bikes, and more. There was a time, of course, when all grand prix classes were littered exclusively with twostrokes, but the simple fact is that either the world cant have or doesnt. The engine produces a maximum of some 34 kw 46 hp power. 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. I know the 900t can be put in standard mode but thats a lot to pay for 600 class horsepower and i dont want the complexity of a.
Why proper carb tuning is critical for 2stroke engines. The boats catamaran style hull is engineered for enhanced stability and maneuverability. The added draw of the control unit and associated electrical pieces will certainly figure into the currentbattery problem. How to increase performance of 4stroke motorcycles. Motorcycle tuning 4 stroke, second edition robinson, john on. Whats the main jet, pilot jet, and needle jet doing. Tuning 125 4stroke i think all of those bikes are more commuters than sporty especially the excessively heavy comet. For 4stroke bikes with fuel injection system, which are devoid of carburetor instead of rejetting the ecu needs to be remapped. I think all of those bikes are more commuters than sporty especially the excessively heavy comet. For example, it is possible to tune for smooth power off idle, a moderately powered midrange, and a. Graham bell, mikuni vmtm carb tuning procedure i took the conversational run down of how to tune a vm mikuni carb from a. All the single cylinder bikes, 2 stroke or 4 stroke having a carburetor.
Maya programming software tool that allows full configuration of the get ecu. For 125 cc engines a 34mm carburetor works well for supercross and. Computer design software is used to calculate the msv for head designs. The next video for racing squad channel will be about my ktm duke. A lesser work would have surely passed into nostalgia heaven long ago. The way a two stroke motor works causes them to be f. Setup carburetor is sure the software more professional on the market to obtain the optimal calibration of the needle carburetor in the 2 stroke engine for every weather or track condition. You can feel the difference with an hp four stroke immediately. For startersthe extra 24w dc current draw for the fuel pump alone may be too much for the charging system of a 50 gy6.
A yamaha yz400, 5valve, 4stroke cycle, motocross racing, motorcycle engine is instrumented to provide pressure diagrams in the exhaust system which are recorded over the usable engine speed range at full throttle from 5000 rpm to 1 rpm. This fully revised and updated edition is one of the most comprehensive references available to engine tuners and race engine builders. I have 3 4 strokes that are inverted in my warbirds without any problems running. From clutches, fuel pumps and gaskets to bottom end engine rebuild kits, we have reliable, performanceefficient parts. The software is set up in such a way as to allow it to be used almost immediately, in a rudimentary manner. Becouse whilst many 125 s might be designed to produce more than 14. The piston crown opens and closes the exhaust and transfer ports. Accompanying the software is a 200 page tuning guide which will, with practice, allow the user to create a very sophisticated tuning setup. Performance affecting parameters of a 4stroke engine. Anyway, i have a husqvarna 125 sm, and im thinking about changing the exhaust pipe. We specialise in honda 2strokes, covering the cr range of motorcross bikes, the nsr250 street bikes, and hrc grand prix 125, 250, and 500s. So if you are searching for stuff like that, the mercury dynoboost fuel programmer is the best option. The intent of the competition is to provide universities with an.
The modern race bike requires precise tuning, knowledge, and expertise to unlock all possible power, ride characteristics, and delivery of power. Dec 24, 2002 thought id better kick the new section off by writing an article for it myself, on the subject of 4 stroke engine tuning, no specific to minis, but al basic concept of tuning a 4 stroke petrol engine the miniclassic community. Oxygen sensor and bungs included, to have closeloop fuel and selftuning features 10. Setup carburetor software for optimal calibration of the. The efficient the spark produced by the spark plug the better the combustion takes place. Many 125s, like the honda cg or yamaha ybr, intended for ecconomy commuting and tuned to use as little fuel as possible and as long a service intervals as possible, only offer around. Basic 2 stroke tuning by eric gorr changing the power band of your dirt bike. Our goal is to achieve the biggest power gains as possible, while maintaining reliability on your 2stroke engine.
The louder the pipe, the better the odds are that you will have to rejet the. Graham bells four stroke performance tuning and made it a little more procedural. I tried a few free ones, but the first attempt at making a pipe from those didnt work so well. On modern street motorcycles exhaust pipes are usually in two parts. One of the main actions of preparation and development of a 4stroke engine consists in the modification of the camshaft. Does this type of pipe gives more midend or topend performance. Apart from pure racing machines, the bestknown fast 125 commonly found here in the uk is the twostroke aprilia rs125 discontinued in 2012, which in its derestricted form can get about 33 hp which will take it up to somewhere around 100mph, e. Ktm duke 125 200 250 390 690 790 990 1290 super duke r top speed 2019 duration. The problem is that if i were to get a 125cc 4stroke it would be barely kicking out more power than my old aprilia rs50, which was tuned to the point it did 80mph. Though whatever i have written here wont do any damage to your machine, finally you must not blame me for whatever happens. A myriad of different aftermarket accessories is available for you to custom tune your bike to better suit your needs. That neat purple and blue color on the header pipes really screams this guy rides fast. Many of todays tuning systems allow timing to be varied over the rpm range.
This fully revised and updated edition is one of the. Vortex ecu vortex ecu maps vortex 10 map ecu for ktm. A 4 stroke 125 is never going to get anywhere near a 2 stroke in power. Detailed modifications and improvements are described. The biggest problem with stock exhaust pipes is the environment they work in. Magnum tuning offers you an assortment of topnotch tuner chips designed to optimize the engine, driveline, electronics, and other systems of the boat. On the 4stroke, intake tuning is also a consideration. In other words, the engine will, after tuning, produce more power from the same displacement. Advanced two stroke tuned exhaust system the challenge the society of automotive engineers clean snowmobile challenge 2002 sae csc 2002 is an engineering design competition for college and university student members of the society of automotive engineers sae. Contents chapter 1 introduction 9 chapter 2 the cylinder. Other books to his credit are modern engine tuning, two stroke performance tuning and forced induction performance tuning. Bell covers all areas of engine operation, from air and fuel, through carburation, ignition, cylinders, camshafts and valves, exhaust systems and drive trains, to.
Software for fine tuning and design of four stroke engine. Page 3 of 7 125 hp 4 stroke posted in sledding general discussion. Feb 17, 2009 alright been a while since i posted on ere, ive had a sh125 for about a year know and am pretty please wid it, never had any problems wid it and its quite rapid will do bout 72mph max. Racingsm software has features for many different areas 2stroke exhausts development, drag racing features, simulators, carburetor tuning, connectingrod analysis etc with all this knowhow along with lufo racing heritage, we believe this is a very fair price. We offer trackside testing for both engine tuning and efi. I have always flown 2 strokes but have just purchased an asp 4 stroke for teh first time. The combustion is the process where the mixture of air and fuel gets burnt with the help of spark plug.