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1. Change the bearings to ball or roller type.
2. Machine all the excess mass off the crankshaft.
3. Machine the cooling fins off the flywheel and use ram air cooling (or no cooling at all if the engine will only run for short periods).
4. Change the ignition to an external battery-powered type and remove the magnets from the flywheel.
5. Change to dry-sump lubrication.
6. Machine away most of the piston skirt so that only a small sliver is left to guide the piston down the cylinder.
7. Use only one piston ring.
8. Use a chrome-plated piston ring.
9. Coat the piston with teflon.
10. Use the lightest weight oil you can find.
11. Change the intake valve timing to close when the piston is only 1/2 way down the cylinder (for a modified Atkinson cycle).
12. If you do #11, increase the mechanical compression ratio up to about 15:1 (or more) since the effective compression ratio will be less.
13. Use an axle clutch to reduce rotating mass if the bicycle freewheel doesn't work.
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