![]() They both offer a variety of combustion chamber inserts for differing compression ratios. The VHM and Phathead are the most popular aftermarket cylinder heads for 2 strokes. Too little clearance will require race gas or engine failure. This is done by correcting the squish clearance between the top of the piston and the head.Ī stock YZ125 has a loose squish tolerance, which is simply due to Yamaha manufacturing it on the “safe” side. Increasing compression is one of the easiest ways to gain power, throttle response, as well as easier jetting!Īn aftermarket cylinder head will give you more torque and better throttle response, as well as make jetting easier. When you update the jetting (it usually runs richer with new reeds because it pulls in more fuel), you will notice more power and better response throughout the RPM range. Stock reeds do a good job, but they’re nothing special when it comes to performance. These are the two most popular reed cage upgrades to get better power and throttle response: Boyesen Rad Valveīoyesen updated their Rad Valve (Motosport) to a one piece aluminum design that’s super simple and easy to install. This could be a low-end boost in torque and throttle response for woods riding, shifting the power towards the top-end and over rev for a screamer, or somewhere in between. In fact, sometimes smaller in some spots is better for overall performance.įind someone that knows the YZ125 engine and can give you the type of power-curve you want. Going bigger with the ports is not always better. If you don’t know what you’re doing, I strong warn you NOT to port the cylinder yourself. The YZ125 has pretty good ports from the factory, but there’s always room for improvement. Porting – what it actually doesĬylinder porting is where you can make or break the power-band on a 2 stroke engine. ![]() On the other hand, if you don’t have the time or confidence to do the engine work, you can send it out to a reputable builder, such as Eric Gorr or Kustom Kraft. Not only will this potentially save you a lot of money, but you’ll have a better understanding of what you like and don’t like about your current suspension setup. Only after you get the right springs, set the sag and adjust the clickers should you even consider paying hundreds or thousands of dollars to get a re-valved shock and forks. When should you send your suspension out to get re-valved? Trial and error until you find the most comfortable setting for you. Try turning the clicker in 5 clicks at a time until you notice a difference. Clickers before re-valve?Īdjusting the compression and rebound clickers are the next step to tuning. The forks can be adjusted by moving them up or down in the triple clamps, as well as adjusting the preload with an added spacer. When the rear end is too low, you’ll have more stability, but turning will be really difficult because it’s harder to get weight on the front-end, and vise-versa if the rear is too high. This is done by setting the ride height.Īdjusting the shock sag is the first thing you should do to set the ride height. If you have the correct springs in, you need to get the bike balanced to handle properly. Stock dirt bikes are usually set-up for 160-180lb riders. See this spring calculator for an estimated number. The spring rates need to be correct for your weight and type of riding. Once you get your YZ 125 running strong and reliable, the next best thing to do is get the suspension dialed in for your weight. If you ride at different elevations or climate, the JD kit may be an advantage due to the custom needles – the stock needle is pretty good and is adjustable. The main difference between jetting the carb yourself and the JD kit is that if you know what jets you need, it’s much cheaper to buy them individually.
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