A good strong cam, pipe, head work, ignition, big carb are needed as well.
Beware of big cams, they can tear your engine apart very quickly!
A good bigger carb. Jetting can be difficult and make sure its a 4 stroke one not a 2 stroke one. Thats important.
A good pipe is vital. It might look like a stock Honda CR80 muffler but its far from it.
Head porting should be left to a pro. Attacking it with the Dremel tool is likely to lead to loss of power.
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Greensborough Motorcycles & Ken Colvin Pty Ltd help out ACS Racing