[David a Calkins]

i had that problem ,with a 125 ,the engine would not start ,unless i pulled the drive shaft ,and the buyler was on the way ,so when i rolled the engine buy hand i was able to hear the tick ,over and over ,so i un bolted the engine a and replaced the spring with a new one ,$2.00 from cub dealer ,you can replace the spring with out removing the engine ,just tie a thread on the old spring ,and remove ,after the cam cover is off ,and do the same with with the new spring ,you don,t want it in the pan ,hope this helps .David