Timing chain Upgrade

[orangeEX]

can some one tell me what bike has the heavier duty timing chain
thats a upgrade for the 400

[ImWhite]

i guess your talkin about crf450,hope that helps

[orangeEX]

any year model my ex is '01

[underpowered]

02 crf 450 is a 4/5 row where the ex is a 3/4 row.