ow many more cc can i get from a boor on a yamaha bear tracker i have to rebuild the engine allready and need to know how big i can go plus this is my first atv engine and how much harder is it to rebuild than a car ening?? and where can i get parts for atv eninges like boor kits

 

Its spelled "bore"

 

Try www.bikebandit.com for stock parts or www.rockymountainatv.com (don't know if they will have anything to suit you). I don't know much about 4-stroke atv engines but I doubt if they are much harder than cars, just takes a bit of mechanical knowledge and common sense and manual(which I finally learned)

 

Check out powroll for bore kits, i didn't see anything listed but you can give them a call and find out.

 

ok thanks for all the advice