on a stockport 12a, say you had a modded yaw or sterling nikki, with upgraded fuel pump, etc, compared to a 44mikuni sidedraft, or similar aftermarket carb....can the nikki produce as much horsepower? or is it necessary to go aftermarket for best HP gains?

im thinking stick with the nikki. i assume with a ported motor, you'd probably be better off with something else...yay or nO

 

You'd be pretty suprised with how well a well tuned Nikki can do. My Nikki is only running off of 2 barrells and I still produce pretty good power and I have a stockport 12A. Tuning the Nikki for your application would probably be cheaper and have the same results as buying an aftermarket

 

On a stockport motor, a Sterling carb will yield just as much power as any aftermarket - properly tuned of course.

 

How much does a Mikuni set up cost???

 

 

If you can find an early 13b carb, from an RX-4, Cosmo or Rotary Pickup, it is easy to make an adapter manifold, and that would give you all the flow you need for a stock motor. I used one on a 12a with stock primaries and street ported secondaries and got about 155 hp (130 to the wheels). If you locate one of these carbs, it should be cheap, and I can tell you how to make the adapter.

For your info, the 12a carb flows nominal 315 cfm, the 13b carb 345 cfm.

 

You can't go wrong with a Sterling carb....

 

kind of off topic, but what kind of gas mileage do you get with the sterling?

 

Let's just say that if you go for *any* upgraded or aftermarket carb, you must be willing to sacrifice some gas milage and all emissions passability.

For "what kind of gas milage do you get with a Sterling" it really depends on a lot of things. The most obvious are the state of tune and how you drive it. If you've got a brand new Sterling, but your timing's off, your spark plugs haven't been changed in god-knows-how-long etc.. etc.. AND you haven't spent any time tuning it, then you won't be getting the best performance OR mileage you could be getting.

And because it has mechanical secondaries, the way you drive it makes the biggest change. Assuming everything else is perfect, you can either get really good or really bad mileage depending on how heavy you are on it. When I'm DDing it to work and back, I stay out of the secondaries, and keep my revvs medium (about 3k-4k) and get good mileage. The second I decide that I want to opt for some "spirited driving", I can start driving it so that loonies start flying out the tailpipe.

Jon

Edit: I just realized that most of you yanks wouldn't understand my last statement. "Loonies" are the Canadian $1 coin. So when I drop the hammer I can see the gauge drop and the dollars fly out the back.

 

^^^^I understood it. But that's in thanks to my Canadian herritage. LOL No disrespect Jon, but it's hard to take a country serious when their main currency is called the "Loony" LOL

 

i vote for sidedrafts.

 

^ +1

 

I plan on going with a Sterling Carb when I get the time and money to deal with upgrading.