The Yerf is an AC volt system, the HH engine started using the DC volt Ignition sometime in 2007 to present. Both buggies were wired differently where Yerf used the ground to switch on and off where as HH used the positive to switch on and off. You will first need to determine what year the HH engine is or if it is AC or DC since each uses a different stator as well as CDI. Make sure the engine is grounded to the rear carrier.
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