Do I need Mikuni "small round" or "large round" main jets?

[fj11.5]

wow that much,  never would of guessed they sat that low  , thanks randy    ,ill check the plugs soon as the frost melts 

[fj1289]

Read a few comments about 125's probableybeing too big...all depends on the needles he has.  Different needles (both initial diameter and taper) will make a big difference on the main jet required.  Learned this one from Marc at FactoryPro when putting stock carbs back on the bike

[fj11.5]

standard adjustable 1100 needles, 6 positions for the clip , plugs were a nice grey colour / with tan on the insulator, may of been burning carbon off from running rich before, the 125 jets felt really flat , have swapped out the iridium plugs for standard ones just to rule them out

[fj11.5]

standard adjustable 1100 needles, 6 positions for the clip , plugs were a nice grey colour / with tan on the insulator, may of been burning carbon off from running rich before, the 125 jets felt really flat , have swapped out the iridium plugs for standard ones just to rule them out

just an update, the small jets were crap, compared to the mikuni 115,s the small ones didnt have any taper before the hole, guessing this slowed fuel flow, as all i changed was the jets, effie now runs past 7k with no issues