Not Ranked
Perry,
If I were doing that engine, I would do a Q-850. I use Q-series carbs on almost every engine I do.
With that being said, I have no clue why your engine needs that much initial timing. Was this engine completely assembled when you got it? Maybe the balancer marks are off?
I guess I'm also not understanding why you need to richen up the idle mixture. You can do it, but it will require different idle air bleeds and different idle feed restrictors. We change those right off the bat in our Quick Fuel carbs.
Sounds like you have several issues going on. Bottom line is that your SS-750 will do a fine job, but you're probably leaving a bit of power on the table. I don't use the HR or SS series carbs unless somebody HAS to have a choke....otherwise, they get a Q series.
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