Its been a long while since I've needed advice, most problems with the bike have been pretty straight forward to sort out and for the most part I've been thoroughly enjoying riding the pants off of her.
Dirtyss has a 741b bottom end with harley crank and flathead power 45cu in jugs and pistons giving 830cc. I've fitted peek rings to the manifold and cured the leaks that were from the nipples and joints.
The Linkert m51 is fitted with a brass float - 1/4" level gave way to rich mixture with constant plug fouling, changing it to 3/8" gave smooth running from idle right through 3/4 of the rev range, although she's a little bit rich at the lower revs, the motor is leaning out in the top rpm range (plugs coming out clean)
The power needle is 1 3/4 turns out, a couple of clicks short of too much fuel, the scout 640 main nozzle has five holes - top three are 41 thou the bottom two being 76 thou, the correct externally vented 1 1/16" venturi is used.
I cannot see that raising the fuel level or adding a main jet is going to help other than bring back the unreliability issues with plugs etc.
Would changing the main nozzle to one with the larger top two or three holes and smaller lower holes alter the mixture curve to suit my bike better. ie the scout 641 nozzle ? or am I way off track here ?
Best regards to you all