Re: Big problems with my Bigtwin? Running super rich, won't WOT (see pics, video)
Hi BonairII. I used to have a '66 33hp Big Twin and she ran great. No wonder you're not getting proper WOT, you carb is missing virtually every seal and gasket it needs!!!! For starters, no, you don't have to remove the flywheel to adjust the throttle cam, but the two little screws/bolt under there can be pesky to reach unless you have a 90 degree screwdriver or small socket. You may have to spend a few buck on a small enough tool to get in there, but it'll be worth it. (I believe the were 5/16" bolts on mine, if memory serves?) You don't need/want to remove them. Just loosen them, adjust the plate according to the lync-n-sync instructions and snug them back down. To answer your other questions. Yes, the butterfly valve should basically be level at WOT (i.e. "Wide Open" Throttle). As you found out, there is a little linkage on the side that can be adjusted to help control this. Between that and the cam adjustment the butterfly valve will open fully and properly. Make sure you're testing the linkages for WOT as there is an armature that prevents WOT while in neutral. As for the carb itself, you definitely must get a carb rebuild kit!!! You're missing virtually everything. It will have all the necessary washers, seals and packings you'll need. It will come with packings for your hi/lo needles, a new bowl gasket (and/or glass bowl gasket if yours has a glass bowl on the carb), a new float needle and float needle arm, a new hi speed nozzle where the float arm needle seats itself (item in your third picture down), it will also come with a white nylon washer that goes at its base. As well as a new throttle body gasket, b/c yes there should be a gasket between the carb and the engine block. You've had air leaks all over the place for all this time and it only take very slight adjustments to the fuel:air mix to make a very large difference in your motor's performance. You can get the kit right here at iboats for about $25. You'll also want to get a new, plastic replacement float, if your kit does not come with one. Your old, cork float is falling apart and can/will/is clogging up your passages. Yes, it should be level when it is properly installed and the carb is inverted. Once you get all the parts, do a couple searches on rebuilding a carb and follow the directions that come with the kit. They're actually quite good. Report back and let us know what you find. Good luck.
Kit didn't include needle packing, so I have no idea what to do to keep needles from vibrating out.