Speedfreek
Member
- Nov 3, 2003
- 153
- 0
Hello,
I'm in the process of rebuilding my 89 yz 250. I need to know what modifications,if any will need to be done to my cylinder head.I'm using a 92 yz 250 cylinder head with a 1.25mm over bore piston from wiesco in a 89 cylinder.I can tell that the combustion chamber is slightly different,but cannot compare due to the fact that the 89 head is very messed up.Any help would be greatly appreciated.If it matters the bike has a pro circuit exhaust and aftermarket reeds.
Thanks
I'm in the process of rebuilding my 89 yz 250. I need to know what modifications,if any will need to be done to my cylinder head.I'm using a 92 yz 250 cylinder head with a 1.25mm over bore piston from wiesco in a 89 cylinder.I can tell that the combustion chamber is slightly different,but cannot compare due to the fact that the 89 head is very messed up.Any help would be greatly appreciated.If it matters the bike has a pro circuit exhaust and aftermarket reeds.
Thanks