i was just wondering, i just bought a 1981 yamaha yz125 and found out that it has a crack in the outter cylinder, i found a cylinder for a 82 yz but i dont know whether it will fit or not can someone please let me know if it will fit or not i would really appreaciate it. and one more thing im looking to upgrade the seat and gas tank to an 83 will this fit this bike, thanks seabass.