Carburettor settings

[Monstyr]

Can some one give me a base setting for the VHBz25bs carbs for throttle stop and pilot screws.

Not sure mine were ever set properly and while I can get it to start it falters after a minute or so and wont run without choke, I'm sure there's lots of other variables but I just need a decent start point for the moment.

[EVguru]

Around a turn and a half out on the mixture screws, slide stops set so you can just see daylight under the slides.

[TurboRestorer]

I'm running 1 1/4 turns out on pilot screws, my float heights are around 14mm as the plugs were always dark/black on inspection and the needles are on the middle clip position.
I am having running/power issues as well. I do have stainless steel exhaust system thou.

[EVguru]

What running issues are you having?

A stumble off idle is common (modern fuel - fit leaner idle jets).

A mid range hole can be ignition, atomisers, or silencers.

Black plugs is pretty normal with modern fuel. Unless they're black and sooty, the mixture is probably OK.

[TurboRestorer]

Running issues are ignition timing is viewable with strobe lamp but when you get to 2500rpm+ the strobe shows irratic ignition timing +- 15deg approx. not stable & I think this is stopping the bike from going over 60mph.
Got new plugs BP7ES & new CDI coils & hasn't changed a thing, looks like ignition coil is breaking down rather than resistance issue (231 ohms cold).
Ignition coil & rotor being looked at NLM.

[72degrees]

Running issues are ignition timing is viewable with strobe lamp but when you get to 2500rpm+ the strobe shows irratic ignition timing +- 15deg approx. not stable & I think this is stopping the bike from going over 60mph.
Got new plugs BP7ES & new CDI coils & hasn't changed a thing, looks like ignition coil is breaking down rather than resistance issue (231 ohms cold).
Ignition coil & rotor being looked at NLM.

Is the pickup "known good"?

[EVguru]

looks like ignition coil is breaking down rather than resistance issue (231 ohms cold).

Low resistance IS the coil breaking down. A value of 230 ohms is actually a little high, I'd normally expect 220 ohm. You might though have one of the less common 300 ohm coils (or a rewind) and if so, having dropped to 230 ohms indicates a problem.

Some jitter in the timing can be caused by excess slack in the cambelt and it's not unheard of for the crankshaft pulley to work loose leading to more slack.

I am suspicious though of the pickup. If it's failing, you can get a number of strange behaviours, even if it checks out fine on NLM's test rig when cold.

[Ralph]

With new silencers my Strada needs one or two sizes up on the main jets but strangely
after a few thousand miles it needs the org ones back I suppose they carbon up a little.

[TurboRestorer]

The pickups are the only thing left if the rotor re-mag. & ignition coil rewind does not fix the problem. Whatever the issue is it affects the rev. counter regardless of which coil its attached to, so it has to be a global electrical issue on the ignition circuit.