A pressure wave of hot expanding gasses flows down the exhaust pipe. At about 90 degrees after TDC the exhaust port opens ending the power stroke.
This pressurizes the crankcase causing the reed valve to close. These four drawings give an explanation of how a two-stroke engine works.ġ) Starting with the piston at top dead center (TDC 0 degrees) ignition has occurred and the gasses in the combustion chamber are expanding and pushing down the piston. That is how a two-stroke engine completes a power cycle in only 360 degrees of crankshaft rotation compared to a four-stroke engine which requires 720 degrees of crankshaft rotation to complete one power cycle. There are different phases taking place in the crankcase and in the cylinder bore at the same time. Use the guide at the end of the chapter to map out your strategy for changing engine components to create the perfect power band.Īlthough a two-stroke engine has less moving parts than a four-stroke engine, a two-stroke is a complex engine because it relies on gas dynamics. Use this as a guide to inform yourself on how changes in engine components can alter the powerband of bike's engine. The most common mistake is to choose the wrong combination of engine components, making the engine run worse than stock. A myriad of different aftermarket accessories is available for you to custom tune your bike to better suit your needs. Nasa baba nabasa ko sa isang site na itinuro ni E.R.Ĭhanging the power band of your dirt bike engine is simple when you know the basics. tingin ko segunda okey pa yan sa pinakamatarik lalo na pag may buwelo. magandang set-up na yang bike mo for the trails of mt. hindi ko pa nasusubukan ang magpalit ng reeds at carb kasi nga may kamahalan. Narinig ko sa trails okey naman daw yun big carb pero yun reeds ala ko balita lalo na doon sa dual-stage. Man your bike looks the bollox!!!!wat sort of top end do you get out of it? ye im putting the foot pegs on a frame that goes infront of the engine and along the bottom like on the original kmx the onli problem i think im gonna have is finding somewere to put the radiator. It's been designed in such a way that its got alot of volume by being so long. My Expansion chamber is a custom one off unit. You know where I am if you need any info though.Īs for the exhaust, You can cut and re-weld the expansion chamber, Providing you try and keep a similar volume inside. I'd love to be of some help, But all these hybrid bikes are so different in style my advice will probably be of no use to you. The power of that engine will rip the sprocket off in no time. One thing I cant stress more is your rear sprocket.Įither drill right through the hub bolt holes, And nut/bolt the sprocket on. I am running 48mm Fastace Forks, A Solid Billet Ally Swing arm, Billet hubs etc.Īs long as you don't mount your foot pegs to the bottom of that engine, I think it should be fine for some moderate jumps. Your bike will probably have a better power to weight ratio because of the style of frame you are using. I've built and am currently riding a Road legal KLX style bike, Powered by a TZR125 Powervalve engine. Fair play for putting in the effort mate.