Is that the KD4 in the picture?
I think the tiller grip is a replacement. I think the original was a bullet grip popular on bicycles at the time identical to the ones below:
They come up on Ebay from time to time. This set was produced by pyramid products, but I have never been able to make contact with them.
Bryan,
That's the Wizard with a Merc carburetor cowl. It's pretty dirty and the gold color is getting thin showing the dull aluminum paint underneath. The grip is wrong, I'll have to try and look this guy up. I know they can be purchased from Old Mercs for around $20.