Idle emulsifier

[wack 63]

I'm trying to set up the idle on a VHSH 30 flatslide as the 60 pilot fitted as standard is far too rich and have ended up with a 37 at the moment.I've emailed Eurocarb for advice regarding the emulsion tube that is fitted before the pilot but not received a reply yet and have spoken to a well known tuner who could offer no light on the subject. The emulsifiers I have are B48 ,B62 and a CD1 but none of then seem to alter much so have removed and just run the pilot but even on a 37 I have to have the airscrew nearly all the way out but at least the motor isn't as rich as when the tubes are fitted.Anyone have any info on them?

[Adam_Winstone]

CD1 is the standard fitted and does not limit the flow, rather, it allows the pilot to be the limit. It is very common to use just a numbered emulsifier tube, which limits rate of flow, or to use one with a big pilot... but the emulsifier will still be the limiting factor, e.g. if you fit a 60 pilot with a B48 the '48' is the equivalent of a 48 pilot.

It is quite normal to run a CD1 with a 35-45 pilot for these carbs so I'm not surprised that yours is running rich, even with the B48 emulsifier tube. I personally find that the CD1 and correct size of pilot is the best way to dial these in.

There are also 2 lengths of pilot available for these (short head or deep head) but either work fine.

Adam

[wack 63]

Thank you for the reply Adam , the carb had a B fitted from new so I tried the CD1 from a 34 carb that had a 36 idle and originally came off a TS1 so maybe I'm in the ball park.Logic says that a pilot in the 30's sounds small but obviously the motor says otherwise, certainly a PHBH would need a jet in the 55-60 range on the same motor.

[Adam_Winstone]

I've just had a look through my little black book and found that my 3 setups on VHSH, VHSA & VHSB are 38-40 pilot with CD1 emulsifier, however, another pal has 40 with CD1, whilst another pal has as high as a 45 with CD1 on his VHSH. (NB: all dynoed bikes)... ooh, just found another 40 + CD1 and a 35-38 + CD1 setup (again, dynoed)

I also have a number of setups from other people listing 60 pilot but used with B45 emulsifier, which simply is a fitted BIG pilot to flow correctly to the B45... the 45 being the limiting factor.

Please don't just go banging in a 35 + CD1, running weak and then damaging your engine but don't be afraid to start with a CD1 and 40-45 for testing, which will see you start slightly richer for testing, then reduce and retest.

Good luck with it.

Adam