I need the following before disassembly:
Please print out this page using the print button below, and send with your engine
Ignition Switched Off
Drive Belt Off
Throttle Taped / Wired Open
Same Number of Pulls Each Side --- # of Pulls ________
MAG __________ psi CEN __________ psi PTO __________ psi
Cut soft lead solder square on the end with a utility knife and bend into an "L" shape. Put the solder thru the spark plug hole, align with the centerline of the crankshaft, and push end tight against cylinder wall over the wrist pin in the piston. Turn the engine over very slowly with the clutch as you reach TDC. Remove, cut off flattened area, record thickness with a vernier, and repeat on the other side of piston. Mark PTO & MAG for each cylinder and M & P for each side of cylinder. Masking tape will hold your pieces in order for future reference. Solder cut square and put tight against the cylinder wall usually squishes down beside the piston - proof you got and accurate measurement of piston to head clearance.
Once you have completed the above procedure, tape the flattened pieces to the proper locations on this test form printout, and enclose the form with your engine.
| PTO Cylinder | CEN Cylinder | MAG Cylinder |
| P = ________ M = ________ | P = ________ M = ________ | P = ________ M = ________ |
| Inch or MM? | Inch or MM? | Inch or MM? |
I will need the centre to centre length of the Connecting Rod. __________ mm
Record Head & Base Gaskets -- Rotax # Holes in Base Gasket = 0.1mm thickness.
Yamaha Base & Head # of layers in each = 1-3.
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