MOPED ARMY

yeah do not cover up those vents. good luck

Do not block those off. They are the float bowl vent tubes.

You didn't say which kit but i'll assume it's a polini. Start with a 94, but that might be way too lean. I know some poeple go up to 130 with four petal setups.

The brass screw is the idle fuel mixture screw.

the black knob is the enrichment circuit, or choke. Up is choked, down is regular.

Sorry, im a bad person.

It is in fact for a Metra Kit.

any more ideas? Is that big knob a choke?

If those holes arent supposed to be blocked off how come some of the phbgs are sold with out those nozzels even there? Just wondering what they do.

steve

sounds right, I heard some one say it was an overflow for when you made a leaning turn for it to spill out, but that doenst sound like it would be benificial

Maybe the float stops working at that much of an angle and it just dumps the excess so the carb will still work, leaning makes sense since there is a tube on either side of the carb.

The other brass screw isn't the idle jet setting...it's the mixture screw. Very important to get that right. Usually what you want to do is screw that bitch all the way in and then back it out 1 full turn and go from there. If it seems good (i.e. idles well and runs well off the line and at more rpms at 1 turn out....) LEAVE IT. You're done. If not, mess with it by richening it first (turning it out) and then leaning it out.

Also, you're probably cool with the stock idle jet it comes with, but if you're having trouble getting it to idle, you should think about changing it out. Remember, that little guy can save your day - if it's too lean and you come to a stop after a long full out run, you can seize your shit at a stoplight if the cylinder is too hot from running WOT for a long time and then not getting enough fuel at idle. That is what the Dellorto manual says and I believe it.

Everything else you said is correct.

my 19mm dellorto came with a 60 idle jet, however, ive been told that the there is no standard main jet and they all come with different ones. i dont know if this is true for the idle jets.

60 idle what kit you running that on and is it the clamp style or rubber coupler maybe jets differ between em. Mine is 19mm rubber coupler style non-race

I have the racing version, rubber coupler style on a metra kit. I can just open the thing up when I get home from work today and see, it's weird there isn't a standard.

sorry i cant do links theres some good info here

http://www.owners.heskethmotorcycles.co.uk/technical/dellorto%20PHF%20carb/intro.htm