But like me, YESTERDAY, before I even put my brand new 1405 on my Scamp, I converted to the 1406 mains, rods, springs, and the pump shot was already on mid. So, I effectively have a 1406 with manual choke. I didn't get finished as I have to replace part of a fuel line tonight. But I will finish tonight. We'll see how it runs, hopefully tonight.
Does the 1405 have more power? In my opinion: No. It is a jetting difference only. Same carb. Does the 1405 jetting make more power? That depends on a whole lot of variables.
Unless you put an AFR gauge on it (or run it down the dragstrip looking at the trap speed) and tune for ~12.5 at WOT or highest trap speed, 1406 / 1405 doesn't matter. Different engines require different things. I don't necessarily think the 1406 set-up I put in the 1405 will make the most power. But, I've been fighting rich on Power Mode and Cruise Mode with the 1407. I should be lean enough (if not too lean) on the 1406 jetting. Either way if it runs great down low, but doesn't hit the AFR I want (12.5) at WOT, I will simply throw a bigger secondary main jet on it, until I get there. That way, I can have my cake (good low rpm (street) manners), and eat it (WOT) too! :D
7milesout
