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Thanks Paul. Yes my carb has neither sleeve inserted in it. Do you think this could be a part of the issue?

Unfortunately I am late to this party. I would also be very interested in replacing my ageing morini ignition to ease starting. Would they still offer the discount now so you think?

Understood, but with that said at the most basic level, when built up, should the slides in the carbs fully close down? Mine are visibly still open at the bottom. Also the manuals always stated that the 350 S needed the 260 BD atomiser but my carbs have the 260K. Would this be an issue? Currently Th...

I will check this again, I am fairly confident that it has a few mm of travel before opening. That said, should the slide close completely down, visibly in the carb, or is it OK to see a gap below the slide when throttle is closed?

Hello again fellow 350 owners. While servicing my bike today and getting ready for some spring rides, I decided to go over the carbs again to try and get them perfect and also to make the bike less likely to stall. I have always seemed to suffer from the dreaded stumble from low revs. I replaced the...

Excellent work, common sense applied and a solution found. Welcome to Morini ownership.

It could be an air leek. Are the slides worn or in good condition? Check that the idle screws have seals on them when fitting them. Another thing to check is that the rubber bung/seal on the bottom of the choke/enhancement lever are intact and in good condition. If they do not seal correctly, you wi...

He does now.

Update. I have ordered replacement pads for the choke plunger as these were not replaced when I rebuilt the carbs the last time. I also plan to replace both the Needles with new E17 and not have the mix of the E17 and E24. I also plan on ordering two sets of idle jets, a pair of 48 and a pair of 45,...

Mark, As with all old bikes, I have no way of knowing what the previous owner(s) were trying to achieve by using the E24 Needle in the front carb. Did they think it was too lean? I actually want to go back to the start and check both my carbs again, fit them, balance them and then see what the colou...

Mark, I made a mistake I meant to say that my Main Jets are indeed 115 and the Float valves were 200. Would the E24 needle make the carb too lean? Also does this look like the correct 260BD Atomiser, apart from its length? https://www.dellorto.co.uk/shop/dellorto-motorcycle-carburettors-parts/dellor...

1977 350 sport. Would the needles have been the same in both and would this be my issue?

OK so I pulled the carbs down and using a magnifying glass I was able to read the very worn markings on the jets and needle and I discovered something odd, possibly? Front Cylinder Carb : VHBZ 25BS Choke : 50 Idle : 50 Atomiser : 260k MainJet : 200 Slide 7447.50 Needle Type : E24 Rear Cylinder Carb ...

The idle jets I will need to check. The o-ring on the pilot screws I replaced and the float bowls are clean.

OK so I have been reading this thread with interest. I rebuilt my cards when restoring the bike and replace all seals but I don't remember replacing the rubber at the end of these. With my bike, putting on the choke on the front cylinder carb does increase idle and is necessary to get the bike to st...