OK, yes, you are exactly right. Someone took the time to machine that nice collar to replace the throttle grip and helix. I’m assuming you can pull that sleeve in an out to advance/retard the throttle. Depending on the year of your engine, there was also a stop button at the tip of the original throttle grip. So, I’m not sure how the engine is shut off now, unless you just pull the sleeve out completely to retard the timing enough to shut the engine off.
http://www.marineengine.com/parts/johns … st+Housing
I have provided a link to a 1983 7.5hp to show the parts breakdown, looks like you will need
43.45,40,52,53,49
Needless to say, there were a few changes to these pieces over the years, so it is important to research using your exact model number. The important piece is the throttle cable itself. I am assuming it is not jammed because you can move that collar back and forth easily. The rubber casings tend to rust and kink as well, so you should inspect it closely before making further investments in repair parts. Like everything else, these stupid plastic pieces and the stop switch are way over priced, the cable price is ridiculous as well. Used tiller assemblies on ebay usually command big bucks as well.
Let me know what year you engine is, will do my best to bring some pieces to Rocky Hill that might help out.
Don
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