As with any motor make sure the idle gap is set, .7-1mm. Then set you lsn to get a good idle. You might be too rich on the bottom and lean on the top. It does help to shorten the Lsn if you have the long one, I have been shortening mine to 2.42 inches they are around 2.6 from the factory. Just grind it to length and round the end. you will be richer on the top but the bottom won't change much.

Rex