You can re-sleeve most of them.
how much would it cost to bore out a 12 hp briggs and stratton riding mower motor
Absolutely not!! The cylinder walls won't take that much over bore before you're in to the water jackets.
5000
6'456 i reckon...
15000.00
7,899
$2500
28,000
The cost to re-sleeve a motorcycle cylinder typically ranges from $150 to $300, depending on factors like the motorcycle model, the complexity of the job, and the shop's labor rates. This price usually includes the cost of the sleeve itself and the labor required for installation. Additional costs may arise if further repairs or machining are necessary. It's best to get quotes from local machine shops for a more accurate estimate based on your specific situation.
It cost around $300 to take a motorcycle safety course in Wisconsin.
$250-$350
7,899