Porting kit usng mods how to#
Porting kit usng mods pro#
Porting kit usng mods mods#
Porting kit usng mods trial#
Porting kit usng mods download#

What it lacks in power it makes up for in handling and quickness making it a fun street or track car for any car enthusiast.

Porting kit usng mods download#

Click here to download it.Despite the Mazda RX-8’s engine problems, it can be quite a fun little car to own and drive. Want to get started with proper riding technique to quickly build your off-road confidence? I want to help you with my free training guide. Clutch control and balance are fundamental techniques needed to ride with control and speed. Suspension, jetting and gearing are important to make your YZ125 comfortable to ride in the woods and off-road, but that’s just the beginning.

Porting kit usng mods mods#

The best performance mods and upgrades for your YZ125 are:

Porting kit usng mods how to#

But none if it will matter much if you don’t learn how to jet your YZ125. The more mods you put together that are meant to improve a certain area of the powercurve, the better result you will get. You can set it up to run on pump gas or race gas. 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 with 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.Īn aftermarket cylinder head will give you more torque and better throttle response, as well as make jetting easier.

Porting kit usng mods pro#

The Pro Circuit Works Pipe would be better for a beginner or if you want to lug your bike more and short-shift. I would choose the FMF Factory Fatty and FMF shorty for big and fast motocross tracks, as well as open desert riding. His results after riding the bike back to back with each exhaust system came back with the FMF setup being slightly more upper-rpm and over-rev biased, while the pro Circuit was a little better on the low-end and mostly mid-range.īased on those results you choose what you want for power characteristics. Kris Keefer tested both of these with a respective shorty silencer from FMF and Pro Circuit. Two of the most popular pipes for a Yamaha YZ125 are the FMF Factory Fatty and the Pro Circuit Works pipe. The pipe, next to porting, is the biggest factor to determining the power curve. If you can remove the carburetor from your YZ125, you’re halfway to changing the reed cage, which is just a few more small bolts.

In the end, you can only gain so much from a Reed change, but the VForce4R will make a noticeable difference, and it costs less than a new pipe. Their new design is more efficient, lasts longer, and provides more air which increases power. The new Moto Tassinari VForce 4 reeds have been developed to give you sharper throttle response and more over rev. Stock reeds do a good job, but they’re nothing special when it comes to performance. 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. 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 PortingĬylinder porting is where you can make or break the power-band on a 2 stroke engine. Going with the Athena 144 big bore kit for your YZ125 allows you to do everything yourself, which allows you to save a few bucks and you know what’s actually going on in your engine. Slight case mods are required, but these can be done without splitting the cases if you’re careful and take necessary precautions. You can expect that much of a power gain with proper jetting. Going from 124cc to 144cc is a 16% increase in displacement.

Porting kit usng mods trial#

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. 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.Īdjusting the compression and rebound clickers are the next step to tuning. 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.