laverda 500 misfire at 5k

[Dellortoman]

You've changed a lot of things there Andy. There's a valid argument that you should change one thing at a time to find out what was actually causing the problem.

 

[tobster]

true dellortoman, but at least I'm now back at a recognised starting point i.e. the factory settings. I did try changing things individually but it was finally going back to 115 mains that seems to have had the most effect. Setting the needles to the middle slot on both carbs was the penultimate fiddle which made the stumble slightly better.

 

[Grant]

But it still stumbles.
Sounds like the carb bodies need a good clean.
Have you ruled out electrics, plugs, caps, ignition switch etc?