The APT guys have stated on the various threads across the various bbs' that the tapered bores are for racing applications when you spend most of your time WFO like on snow mobiles or other vehicles where you mainly ride WFO. For most enduro, trail riding, hare scrambles type applications, they recommend the 36mm. Can't wait to try mine, I have it, just waiting for the bike to show up!
BTW installed a FBF ported 165 kit, HUGE Doma KTM 200 pipe and APT carb last night. Will start a new thread on this frankenbike. Fired right up and ran great around the hood. link to this bike info / review - http://www.cafehusky.com/threads/my-second-165-kitted-bike-and-its-the-frankenbike.29265/
Like MotoMarc36 said, the "taper bore" is from the intake bell side toward the throat. A standard carb is one diameter from just before the slide the rest of the way through. A taper bore will be bigger on the bell side and tapper down to the normal size. Normally at around a 2 to 5 degree taper. The small bottom and large top of the throat is called a 'key hole" bore. And yes, it's supposed to act like a smaller bore carb on the bottom and bigger bore carb on the top.
The early order program is up and running. I placed my order and it was #1586 in just the two hours since they opened it.
I wonder if they started at #1500 or something. It is very, very hard to imagine they pre-sold over 1500 units in a couple of hours, but I may be wrong!
Unless..... GasGas, KTM, and/or another bike companies placed orders. I guess I need to log on and get an order in too . Walt you aren't snowed in yet are you?
That is probably just their total invoices to date. But I fully expect them to sell a thousand of these very quickly.
The weather man said there was a 100% chance of snow last night and today...........Zip. I actually would love to try your 36 now as they don't make the 36 in the cast version.
You are welcome to give it a try Walt just pry it off Kelly's bike and bolt it up . Or.... just give him a call and get him send it your way when he's done. I still have two bikes to ride so I'm good.
I went to the apt website a few weeks ago and clicked on the "notify me when available" box for the billet 36. I wonder if I still need to pre-order one or not. I sent corey a pm and hope to hear back soon.
It's my understanding the billet carbs are in production and should be ready in Jan. . The cast carbs are the pre-order units so they can get an idea of demand and should be ready by spring. Cory has been great at getting info out so I'm sure he'll get your question answered.
