How to increase the capacity of the motorcycle "Minsk"

To increase the power of a 125-CC motorcycle "Minsk" athletes and fans was timesworksANO many methods of speeding up the motor. The efficiency (power gain) of each method depends on the complexity of the work performed. The simplest methods involve the use of common parts and no need to use any machines.

You will need

• - a set of files and needle files;
• - welding Assembly;
• - piston rings;
• - К65И carburetor with intake manifold from Izha Planet

Instruction

1. Make sure that the engine is in good condition crankshaft bearings and seals. Crankshaft is in perfect condition. Purchased the piston is prefabrication, the intact ring of the correct form tight and retaining rings.
2. Measure by-pass and blow-by channels in the cylinder. If their size there is a difference, cut out the gasket under the cylinder on the contours of the crankcase and attach it to the cylinder. Then remove the bevel in the channels to a depth of 10 mm to match made a stencil. The angles of chamfer zakruglenie a radius of 3 mm.
3. Sawed the inlet window so that it rose to 1 mm. When the operation is running continuously make sure that the engine piston in its bottom dead center did not open its upper edge is a window.
4. Follow the grooves in the bottom of the piston to improve gas distribution and heat sink of the motor. Grooves make flat (not round like the bottom of the piston) and place them symmetrically. They should reach almost to the center of the piston. Transitions align with sandpaper.
5. Piston rings, Polish with sandpaper on the inside, and remove the chamfer from the inner radius of 0.25 times the width and 0.5 in height. Piston skirt shorten by 5 mm, if you're not going to change the carb. If the carb plan to change, shorten the skirt 11 mm. In this case cut away at an angle, and the bypass window in the piston will move under the window in the sleeve.
6. The piston will strike the bottom of the groove under the ring. Close with a stopper and symmetrically on the other side drill a recess with a diameter of 2 mm to a depth of 2 mm and back press aluminum wire. The place of pressing, align the needle files. The bottom of the piston, Polish to obtain a mirror surface. Remove more small chamfer around the entire circumference of the piston skirt.
7. Install the carburetor К65И with nozzles 32 mm and the intake manifold from the motorcycle IZH Planeta. The manifold side of the cylinder cut by 30% and grind the manifold to the size of 24х34 mm When fitted on the carb should take a horizontal or slightly inclined position. For mounting manifold to cylinder studs bend to the required angle. Then adjust the shirt of the cylinder in the intake window to seamless match the manifold.
8. When assembling the engine, discard the head gasket of the engine block. Flange seal with adhesive, sealant and tighten the carburetor without using excessive tightening forces. Install the muffler of the sample in 1980. It has a long cigar-shaped form with smooth narrowing at the end. Installation possible move it toward the cylinder, shortening the length of the outlet manifold to a value of 300-350 mm. He inside of the muffler horses remove. Put the oil filter from KAMAZ as air.