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throttle Slides

An explanation of the two types of slide for Dellorto PHF and PHM carburettors
PHF/PHM slides are split into two categories, early and late. Early carbs need an early type slide, later carbs can use either. The way to tell which type of carb you have is to remove the top and slide and look inside at the base where the slide sits. Early carbs have a round base
 

Later carbs have a round base but the top and bottom is cropped to give  flats on the side like this.

The slides therefore differ in the size of their idle speed ramp, Early slides have a small ramp, later slides have a larger ramp that is given clearance by the cut outs in the base of the later carb
 

 

You can see here the slide on the right has a larger ramp and will only fit a later carb.

Early type PHF/PHM slides are becoming hard to find now as production stopped some time ago ..Despite what Dellorto say it is not practical to adapt the new slides to fit old bodies because you need to machine most of the Tickover ramp down which gives you virtually no adjustment with tick over  after a few months. this of course does not apply to Laverda  triple slides which dont use the tickover ramp.

 

The numbers on the base of the slide refer to the slide cutout and Pump ramp so for example a 60/1 has a 60 (6mm) cutaway , the smaller the cutaway the faster the airflow over the atomizer and the richer the mixture, The /1 refers to the shape of thepump ramp that in turn dictates when the pump starts, its duration as the throttle opens and the quantity of fuel dispensed

 

VHB slides are only available new in #50 now £68.00 each

UB/MB slides are only available new in #70 now  £64.00 each

New (Current ) style PHF slides available from stock (All other sizes to order, usually 48 hours)

70/2

60/1

60/2

60/3

50/3

 

all at £62.00 each

New (Current ) style PHM slides available from stock (All other sizes to order, usually 48 hours)

60/1

60/5

all at £62.00 each