hillbone said:
hi. I want to go with a pair of mikunis on my 850. i appreciate it will take a fair amount of testing to get it right.
Can someone give me a starting point for the jets, slides, needles etc. i,m hoping someone has a good set up that will be a great start. I run the larger diameter headers and mufflers, 60 thou oversize and stanadard porting and cam. i dont have a book or guide so your info will be a great start. cheers mark
This is strikingly reminiscent of your very 1st post back in 09.
Here is what I think is the poop on twin Miks. It is a given that a single Mik, unlike the Amal, has an incredible number of jetting combinations and the suggested starting point is just that, a suggestion. No 2 Norton's breather exactly alike and therefore it is somewhat excepted that there will be some adjustment to be made in this regard.
Let's say that there are 10....no 20 possible adjustments whether the main, pilot, needle, needle jet and so on, to be considered. This means that there will be the same to be consided for the second carb. You can get away with a wide range of adjustments with the screws on an Amal whereas the Miks and jet adjustment dependent with a narrower range available with the screws, being a fine tuning situation.
So, you have roughly 20 jetting possibility with one Mik (base around a suggested starting point), and 20 for the second Mik. One might think that this adds up to 40 possibilities, for although no 2 Norton's breath alike, the Mikuni's will surely show with their finer adjustments that no 2 cylinders breath exactly alike either. (hence the balance tube that people be hashing over).
So, instead of assuming 20 + 20 equals 40, It may be more realistic to say that 20 X 20 = 400.
Anyhow, good luck with that idle.
