End gaps, or ring gap
Briggs and Stratton Motor:aluminum cylinder bore compression ring end gap should be no more than .035 inches (.89mm) Oil ring end gap should be no more than .045 inches (1.14mm) Cast iron cylinder bores compression ring end gap should be no more than .030 Inches (.76mm) Oil ring should be no more than .035 inches (.89mm)
Two stroke engines are very easy to rebuild. The transmission component is not. The typical rebuild of a two stroke engine consists of removing the cylinder and replacing parts on the piston assembly. Before you order any parts, inspect the cylinder wall for wear and marking. If the cylinder is damaged you will need to get it machined and then order an oversized piston and ring to go with it. If its not damaged, order a standard (or performace) top end rebuild kit wich comes with a piston, piston ring, piston pin, piston pin bearing, and gaskets. So, for your standard rebuild of the top end you would remove one of the snap rings on either side of the piston pin. This will allow you to push the piston pin out from the opposite side. Once the pin is out the piston will come off the connecting rod. Take note of the piston orientation for assembly. The piston pin bearing will now be accessable (you will find on the connecting rod where the piston pin attached the piston). Minor assembly of the piston prior to installation makes it a bit easier to assemble. Place the piston ring on the piston and align the gap with the small pin you will see in the ring groove (turn the piston ring until it falls into place). Install 1 of the snap rings in the piston where the piston pin slides through it. The piston is now prepped for installation. Place the new piston pin bearing in the connecting rod with some assembly grease to hold it. Place the new piston onto the connecting rod so the hole in the piston matches the hole on the connecting rod. Slide the piston pin through the piston, connecting rod, and into the other side of the piston until it contacts the snap ring you installed earlier. Install the last snap ring into the piston to hold the pin in place, cover the outsides of the piston in assembly grease and lower the cylinder onto the piston. If you don't have a piston ring compressor you can hold the piston ring tight to the piston with your fingers. If you encounter any resistance when your putting on the cylinder you can LIGHTLY press the piston ring into the piston with a small slot-head screwdriver. Once that is together you should look up the torque specs for your make/model or if your not that picky just tighten them up at your discretion. If your looking to do anything on the bottom end of the motor or in the transmission I would HIGHLY recommend getting it done at a shop. Unless you know what you are doing you will have a puzzle of gears and springs to put back together.
The split or gap in a piston ring is called the ring end gap. It allows for the ring to expand and contract with changes in temperature during engine operation, ensuring a proper seal against the cylinder wall.
You have to replace the piston rings and/ or the piston. Once you take the cylinder off, you should make sure nothing falls into the bottom end of the engine. If you are not familiar with this, then you should consult a mechanic.
The clearance between the piston and cylinder is maintained by the piston rings, the ring centers the piston within the cylinder bore and is the device that seals the cylinder bore and creates and maintains the pressure created by the piston movement in the bore. When assembling an engine you will need to check and set end gap of the rings, this is done by centering the new ring in the bore and measuring the gap between the ring ends, you can measure this distance with feeler gauges and adjust by filing the ends of the rings to increase to the recommended tolerance, this tolerance is measured in .000 of an inch and different engines require different end gaps. This end gap is determined by the diameter of the bore with the greater the bore diameter than the greater the end gap,.
combustion pressure will leak into the crankcase, and oil from the crankcase will leak into the cylinder.
a far from my knowledge one piston stroke is the distance the piston head traveled from bottom end of cylinder to top end of the cylinder
I belive there is a snap ring one the end of the axle that keeps it in. On the end that goes into the transmission, about a quarter of an inch from the end there should be a groove in the axle. If there is, there should be a ring in it.
It is the distance between the end points of a line measured using Imperial units.
This is another of those situations where you need someone to show you how, but if you want to try on your own, start with the oil ring. Depending on the type, it may have come in 3 pieces. The 3 piece oil rings are a bit of a puzzle for the first timer, and you'll need to follow the guide, putting the center piece in place first then the two spring steel pieces will go to the top and bottom of the grove. Just put one end of the spring in place and feed it around the piston without kinking the spring steel. Also make sure the center ring doesn't overlap itself when you're done. Or the oil ring may be a single piece. For installing single piece rings sometimes snap ring expander pliers can help you expand the ring while you slide it over the piston. The rings are somewhat springy, and will tolerate expanding enough to get them over the piston, but don't try to open them up beyond that. Look at the package and note the marking that indicates the top of the piston. The three piece oil ring won't require orientation like the single piece other rings, but look carefully and note the markings. Sometimes it's a dot on the piston, sometimes it's a dimple but the package should show what to look for. Last, use a ring compressor over the pistons when you're putting the piston into the cylinder. Align the "front" marker on the piston to the front of the engine then press the piston into the cylinder, making sure that the rod cap bolts don't scratch the crankshaft.
Each piston has an arrow on top. Point it at the flywheel end.