Power Valve Disassembly - Prior to taking the power valve system apart, spend some time reviewing the procedure in your service manual. Bearings and other running surfaces have an incredibly low tolerance for dirt, no matter how little. (See illustration 2) 2. © ProX Racing Parts. ProX pistons should be measured perpendicular to the wrist pin, a quarter of the way up the piston skirt from the bottom. Prior to taking the power valve system apart, spend some time reviewing the procedure in your service manual. Usually, the open end of the circlip should be oriented to the 12 or 6 o’clock position. A great way to take full advantage of the 21st Century engineering that goes into piston rings is optimize the break-in / ring seating procedure. To check the cleanliness of the cylinder, rub a cotton swab around the bore and look for contaminants. For this, use a bore guage and a set of calipers to measure the bore size. Wiseco is Going Racing with Honda HRC again in 2021, The Best 2-Stroke Engine Rebuild Video You'll Ever Watch, Mixin' Gas, Makin' Memories: 2020 Wiseco 2-Stroke MX World Championships, Polaris RZR: Rebuilding the Legends with Wiseco, 2020 Wiseco 2-Stroke MX World Championships Are Back On, everything Wiseco offers for your machine here. Check the top ring for inside bevel, and install bevel up. For additional insight into how the components interact, review the exploded views in the service manual and look at part microfiches, which can be found online. If both top and 2 nd rings have a dot and your set has a coating, the OD will be metallic in color where as the 2 nd ring will usually be black. Diagnosis  - Before tearing the engine apart, are there any signs that a specific problem exists? FC 7.5.1-28. This typically happens as the ring transitions out of your fingers and into the cylinder bore. To check the cleanliness of the cylinder, rub a cotton swab around the bore and look for contaminants. Piston Removal - Easy piston circlip removal can be accomplished by using a pick and needle nose pliers. The manual is the only place you’ll find service limits, torque specs, and other key data. - Don’t forget to install a new spark plug, and, if necessary, gap it appropriately. Once again, use the wrist pin as a backstop then install the remaining circlip into position. Once part way out, grab the circlip with needle nose pliers. Occasionally, one of the rings may come out of position in its groove and snag the cylinder bore. A safe bet would be to ride the bike like this for 5 minutes, then 10 minutes, and finally 15 minutes, with adequate cooling in between. Read our complete guide to cylinder prep here. A final measurement we recommend taking is the rod small end diameter. This will ensure your piston ring(s) are evenly and properly broken in. Rings - The compression ring(s) will be directional, and the top of the ring is typically denoted by markings near the end gaps. ProX pistons come with the piston, ring(s), pin, and clips all in one box. Be especially careful when mating the cylinder to the piston assembly. Then, shut the engine off and let it cool until it is warm to the touch. - Before tearing the engine apart, are there any signs that a specific problem exists? Take time to thoroughly clean the machine before opening up the engine, especially if you will be servicing the top end without removing the engine from the machine. If low CR is to be used with the 78 stroke crank it is best to use the 82 stroke P/C sets to achieve the extra deck needed. ProX two-stroke pistons are manufactured by the same OEM-suppliers to exact OE specs. Cracks are more common on older engines, and propagation all the way through the manifold can lead to air leaks. The ease of pin removal will be largely dependent on the engine design and condition of the bore. Once the wrist pin has been removed, the piston can be removed from the rod. Subtract your piston size measurement from your bore size, and you have your piston-to-cylinder clearance. Rod Small End - Check the small end rod bore for surface defects such as pitting, scratches, and marring. To correct this, the excess plating must be carefully removed. Usually, two compression rings are installed on the piston. Often times, excess plating can inhibit power valve movement. On cylinders utilizing blade style power valves, the blade position with respect to the cylinder bore should be checked to ensure the blade does not protrude into the bore. Clean the bore until no contaminants are visible on the cotton swab. How-to Install Thunder Products TPI Torque Wings Tech Video – TPI Oil Myths Product Showcase – Slavens Mule Quickstart Capacitor Product Showcase – Slavens Mule Fuel Transfer Hose Product Showcase – S3 Brembo Master Cylinder Protectors Product Showcase – TwoRide Top Hand … Ensure any rubber coatings on the reed cage are in good condition. Top-end rebuilds shouldn’t be taken for granted or oversimplified since they deal with the heart of the engine. At the very least, you’ll likely be replacing the piston and top-end gaskets. Your local cylinder shop should be able to handle the bore and replate when necessary, and a simple deglazing can be accomplished with a Scotch-Brite pad. Tech. Use a pick or screwdriver to confirm it is fully seated and does not rotate. Clean the bore until no contaminants are visible on the cotton swab. To effectively clean the cylinder, use warm soapy water and a bristle brush, followed by automatic transmission fluid or a similar cleaning solution and a brush or lint-free rag. Cylinders that have been exchanged or replated should have the power valve system reinstalled ahead of final installation. For us, this ensures a high level of confidence and safeguards against external oversights. Dirt is one of the leading causes of engine wear, and limiting the opportunity for dirt to enter the crankcase is very important. Check out these three pre-teardown tasks that will streamline the whole process. Clean Machine - Take time to thoroughly clean the machine before opening up the engine, especially if you will be servicing the top end without removing the engine from the machine. Some rings are tapered on the top surface to let cylinder pressure slip under the ring and force the ring against the cylinder to form a good seal. Apply a light amount of assembly lube to the small end bearing and wrist pin bore on the piston, then install the bearing, align the piston with the small end of the rod, and slide the wrist pin into place. Orient the circlip to the desired position, then push the open ends of the circlip into position first. Torquing - Your cylinder and head nuts should always be torqued to the specifications outlined in your service manual. Meticulously check all the top-end parts to ensure they are in good working condition. Most piston rings have a top and bottom surface, so it’s important to install them as intended. Let’s dive in! Here's how to do it right. Many applications can also be purchased with a complete top-end gasket kit from Wiseco. Orient the circlip to the desired position, then push the open ends of the circlip into position first. Install Piston Rings 4 Stroke. Any honing grit that remains in the cylinder will facilitate premature wear of the piston rings. Connecting Rod Installation. When using a two piece oil, install the hump style spring in the groove then follow the above instructions. Oil ring expander: Place the oil ring expander into the oil groove with the butted tips of the expander 90" from either end of the wrist pin. Rebuilding a top end is a task most two-stroke owners will run into at one point or another. Once installed, use a pick or screwdriver to confirm the circlip is fully seated and does not rotate. Align the piston with the small end of the rod, and slide the wrist pin into place. Work the opened ring down from the top of the piston to the oil groove. They are available in A, B, C, and D sizing for most applications. When running your new top end for the first time, keep the engine slightly above idle, with slow and mild revs until the engine starts to get too hot to touch. Or crankcase leak down test, are there any diagnostic tests such as how to install piston rings 2 stroke, scratches and! 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