I got my engines fromToolTown($120)up here.If you're in the US,look at Harbour Freight or similar tool stores.Look for honda clones.They look and run just like real Honda engines,but are much cheap.
Lawnmower engines are vertical shaft and very difficult to mod for minibike use.
Most people make their own exhaust systms.It does boost performance a bit,but can make it much louder.
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