Here are pics of production 83-84 kx cylinders vs 84-85 tecate cylinders. Tecate cylinder pics are the ones on the left, kx pics are on the right. When looking into the exhaust ports you will see the kx cylinder is heart shaped with a (bridge) separating the port to keep the rings from snaging since the port is much wider then standard tecate cylinder. Tecate cylinder is oval and wide open. KX cylinder has two extra small exhaust boost ports "one per side: above the standard tecate side ports. Intake bell and transfer ports are identical on both tecate and kx cylinders, so the cylinders have the same ability to flow on the intake side. The exhaust is where the power is found. Since all engines operate with peak efficieny coming from a balanced flow of air through it, this has to be a balanced ratio which the kx cylinder maximizes. Putting a big carb on a detuned (restricted) tecate cylinder interupts this flow since it can't purge exhaust fast enough, and throttle response will be slow off idle and top end will suffer greatly. These kx cylinders are an easy way to gain 5-7 hp with a 38mm carb and careful tuning. With this simple mod you will have no problem beating any relatively stock 250 trike. The last pic is a shot of two kx cylinders on the right, the center is 72mm or 265cc which really fattens up the power everywhere. Before you buy make sure it has this bridge so you dont get let down since the outsides of both are identical. It is the only way to be 100%. And remember these cylinders were all nikasil plated when new and is the best way to go if you need to renew one. However if it has already been sleeved go for a nice clean overbore since it can never be plated again. Hope this answers some of your questions. So let the hunt begin for these power packed monsters!!!!!!
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Originally Posted by hadar
