Thanks for the info grizz, great little guide. I have a question regarding the long needle carbs (thinking of getting a D5 precirotate engine but nervous I wont know how to tune the thing!)... when tuning a short needle carb I always begin with the HSN tuning for top end and then move on to the LSN for off the line performance. How does this differ with the long needle carbs? Do you start with the 7sec pinch test and adjust LSN accordingly and then simply tune for WOT max revs on the HSN and basically not touch the LSN any more?
I mean, do you start with the LSN and then go to the HSN instead of the opposite with short needle carbs?
What would happen if for example in a long needle carb I have set my LSN, then tune for max revs on the HSN and it lean bogs, my short needle intuition says richen LSN however grizz's guide says NO, common mistake, I richen the HSN and in theory I will have a smooth powerband and max revs?

Thanks again!