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Evening! Took the plugs out of my 1980 Strada and it’s clear it’s running rich. I’ve established the stock setting for the mixture screws are screwed in then 1 1/2 turns out. I’m going to miss the Queen’s party to attend to this, my question is do I have the engine running and/or warm when I undertake it? Also, having adjusted the mixture screws do I need to do anything with the throttle stop screws? If this topic has been explained in an earlier post I’ll search it and whilst I’m aware the carbs probably need proper balancing and timing checking (which I’m organising) I just want to get the basic settings right before I put my new shiny BP7EV plugs in! Thanks in advance

Things to know....
Does each cylinder respond by slowing down as you turn the mixture screw in on each carb or is one unresponsive?
Do the chokes really close off when the levers are down, i.e.the sealing tips are not perished?
Is there a little bit of slack in the cables i.e, slides not hanging on the cables?
The air filters are clean and standard?
The carb jetting is very similar to the data below. The exception might be smaller pilot jets, say 43/45/48 area.
https://www.motomoriniclub.nl/carb.html
You usually need to adjust both mixture and throttle stops to get both slides lifting in unison and a correct mixture.
Have a look at Paul Compton’s Morini carb balancing on youtube.
At least you can get to these carbs easily. My other Morini hides them under a big petrol tank.
Hope this helps.
John

Thanks John I’ll check these, the chokes certainly do each close off, I know the previous owner totally rebuilt the carbs, I’ve got the bills! He also fitted the Venhill cables and whilst the action really is silky smooth I guess that doesn’t mean they don’t need checking! I’ll have a go over the weekend but any help is appreciated as I’m no mechanic

Before adjusting carbs ensure timing and valve clearances are correct. The screes only alter mixture at smaller throttle openings. You may be running rich at larger throttle openings. This could be needle height, main jet size. Lots to think about.

Thanks Mickey, noted!

3potjohn wrote: ↑01 Jun 2022 19:47
Have a look at Paul Compton’s Morini carb balancing on youtube.

John

do you have a link to this video, looked through most of all Paul's video's on youtube but couldn't find it

regards Anne

This should be your answer Anne
https://www.youtube.com/watch?v=TEdK7DNuNfM

Al Limite wrote: ↑02 Jun 2022 13:38 This should be your answer Anne
https://www.youtube.com/watch?v=TEdK7DNuNfM

thanks,

Just an update I performed adjustments to the mixture and throttle screws and I must say it’s running much cleaner and ticking over very evenly when warm. My (professional) mechanic mate is going to do the timing and balancing of carbs but for now I’m riding a nicer Strada, thanks all!