Metrakit directions

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Instructions for Metrakit.

See the original in Spanish
click to enlarge
  1. Compression: All of our kits are made with the appropriate compression such as complete top ends and without head.
  2. Crank arm: Once you have taken the cylinder apart, check the connecting rod on the crankshaft. There shouldn't be any vertical play, and the side-to-side movement should exceed 0.7 mm.
  3. Piston skirt: Check the piston skirt for damage. If there is any, trade it for a new one.
  4. Ports: If possible and if you have the tools, touch up the ports so that they match the cylinders as close as possible for a better flow of gases. (aka chamfer your ports).
  5. Cleaning: Clean the piston ring slots very well. Grease up the ring grooves as well as the cylinder and piston.
  6. Piston: Important -- the piston has an arrow on it pointing to the exhaust port.
  7. Important: Bolt the cylinder head on in a criss-cross (like an X) pattern.
  8. Tuning/Timing: Set the ignition timing to 1.8 mm to 2mm before top dead center. Change the spark plug for a grade equivalent to NGK B7HS.
  9. Carburetor: Increase its size up to a maximum of 21mm, and adjust the jetting appropriately depending on your altitude, climate, and other installed parts.
  10. Lubrication: Use synthetic two-stroke oil.
  11. Breaking in: It is recommended that for the first 300 km (200 mi) you do not go WOT. This way your cylinder will last longer. It's also recommended that you increase your oil by 1%, so if you are using 2% go up to 3%.
  12. Exhausts: If you want more options we have a wide catalog and variety of exhausts . Metrakit is not responsible if you choose to use another brand's exhaust.

This is not included in the instructions:

During break in, it is recommended not to run synthetic oil. Petroleum based oil promotes easier wear for piston rings, which will allow the kit to break in better/sooner.