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Discussion Starter · #1 · (Edited)
I guys I'm new here but got some questions I'm working on a yx140 motor and have taken out stock cam and put in a new z40 cam it came with harder valve springs but I haven't put them in because I don't Have a valve press and couldn't be assed the stock cam also had a one way sprag or clutch thing one the end do I need this on the z40 ? And will it run good with standard springs? Also the cam seems slightly shorter and the sprocket rubs on the head ? Is this normal thanks please let me know
 
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