Re: Science fair Ideas....
Converting your motor bike to run on ethanol might be a science project.
I think it would only require a larger main jet in your carburator. (Do a search on
alcohol or ethanol and see what other members have done)
Home depot sells a veggie based 2 stroke motor oil.
Your bike would be "Fossil Free".
Some current formula 1 race cars use a KERS system; converting braking energy to stored power for later acceleration. Some generate current to charge a battery. Others spin a flywheel with braking power. The flywheel system might not be too hard to add to a bicycle, utilizing a friction roller to transfer the power.
When I received my motor kit, I asked my teenage sons if they wanted to use it in a science project but they were not interested.
“You're only young once, but you can be immature as long as you like" -Unknown