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IF YOU WANT TO RUN A CABLE, THESE ARE THE PARTS YOU NEED TO GET AND THIS IS HOW YOU DO IT
The throttle cable is not recommended, the Accu-Tech throttle linkage is easier to hook up and it works smoother if you adjust it correctly. 

Throttle Cable parts:

Call your local bicycle shop, ask for a Road bike derailer cable.  Look for one with a small enough end on it so you won't have to grind it down to fit the carb swivel. 

Approx 3' Cable housing
2 ea Cable housing end caps
1 ea barrel adjuster nut
1 ea index shifting cable

THROTTLE CABLE INFO BELOW, scroll down

WARNING: Always set your boat up so you can kill the engine with the radio. You will need a kill switch connected and activated by a 3 rd channel to kill your engine reliably. Simply closing the carburetor will NOT kill the engine reliably, you MUST have a 3 rd channel kill switch installed. Some radios have a feature that allow you to mix the 3 rd channel with your throttle channel, this will allow you to engage the kill switch through your throttle trigger. Read your radio programming instructions and understand them. DO NOT operate your boat until you are positive you can kill the engine reliably with a kill switch of some type. You need to contact the kill switch manufacturer/supplier and get the correct kill switch that is compatible to your particular radio. For example, you can review the gas kill switch at www.killerrc.com A good kill switch will also be a fail safe if you have radio issues. Shop for quality, not a cheap price.

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The Accu-Tech RC Hardware throttle linkage QDTL-100 makes hooking up your Walbro WYK33 carburetor just as easy as hooking up your WT-257 on a Zenoah.   If you extend the linkage rod you can mount the bell crank on either side of your engine.  We ship all Pioneer engines now with the carburetor in this position (position B) to work with this linkage.  This linkage works much smoother and easier to hook up than a cable if you adjust it correctly. 
EASY HOOK FOR THE WYK33 THROTTLE LINKAGE FROM ACCU-TECH RC HARDWARE