Carb Advice needed!

[beardy bloke]

Engine is up and running !. I think that the choke was sticking so I have positioned cam to it does not open throttle up when starting , starts fine and runs a lot quieter , but on a long run noticed loss of power at top end , I assumed that the secondary jet was not opening . Having checked on the drive running engine up to 4500rpm does not open the secondary?, what revs should it open at and how do I adjust to make it I have lever mechanism on top of cam . Not sure if this is enough info , engine is running a bit rich at the moment but I don`t think this matters. The secondary does open if you move throttle by hand with engine not running , decided it should open before this point so stopped. As before any advice would be appreciated .

[mirafioriman]

The secondary opens due to throttle position rather than revs. If you ran it up to 4500 revs without load the throttle may not have been open far enough to open the second choke. Do you have a rolling road facility nearby? It might be worth spending a bit on a rolling road session where you can get everything set up correctly with the engine under real life conditions.