crxracer11
Member
- Aug 28, 2005
- 8
- 0
I`m kinda wonderin how much horse power doe`s a 1982 yz 490 have,i have this thing punched out to 89 mm bore,(last bore,before a new sleeve)i have a mag from 1982 with all the stats,but it doesn't give the horse power.am i to figure around 48 or so,the only mods i have are a weisco piston and rings. bored out to 89mm,and boylson reeds........any help on this would matter??
