Dellorto PHBG 21mm Carb help

think im gunna have to stick standard carb back on tbh, cus all the jets iv got are 88 +

and its on a 70 atm and is nearly there i just lifted the needle up two notches, and the delay when you back of is worse,

tis like when yuou hold the choke on then back off and get back on the throttle, so maybe more air needed?

 

stock carbs back on, i need to get myself some more jets, it just seemed like it was runnin very rich, even with a 70mj and needle in lowest position

 

try dropping the roller weight down to about 3.5

 

You`ll probably find the needle is too rich on this (had it a few times running 21`s on minerelli`s) it`s probably best on it`s lowest setting but still not good and burbles and farts at half throttle?
Need a weeker needle (fatter section at half to full length or less taper).

 

basically, when you initially put the throttle on, it burbles and really bogs, like the chokes on, then it wil clear at higher revs and ride fine, then if your flat out and back off the throttle then throttle it again theres a delay before it reacts, like the chokes on, but its not, and iv tried the air screw all the way in and out lots and various positions etc.

 

na because tis even like revving it on stand etc, with no load so cant be rollers,

and i put some 3.6g's in and just revs and acceleraqtes really slow, ie too light, thats 2.9g lighter than stock, maybe pilot jets too big.?

 

basically, ill tell you exactly what happens.

get on scooter, go to pull away, burbles and bogs like choke is on, then revvs build up, pulls away pretty fast, smoothly accelerates throught revv range upto to full speed (no top end different at all to standard carb) then if u just let of the throttle, then open it up again theres a delay, then it will just revv and carry on as usual.

seems too rich on pull away then not sure asbout the delay when you open it up again

 

noooo, tis carburation, like the engine stuggles to rev, i know i probably sound dumb

ive never really setup a slide carb like these before, im used to the carbs on my kart, ie, a low speed jet and a high speed jet and to choke it you cover the air inlet, its a lot simpler tbh

its ticks over high then suddenly ticks overr really low,

basicaly it struggles to rev up to begin with, like it takes time to build up. whether you ride it or if its on the stand,

 

need to lean out the idle mix by the sounds of it for a start

 

ive had it screwed all the way in, and like to about 5 turns out at 1/2 turn increments and makes shittt all diff

 

you say the revs stay high then bring them selves down thats rich idle mix

adjust it till it will rev up qucikly from idle and when reved up revs will drop straight down to idle speed

 

it wont lol, thats what im saying, iv tried needle in 4 different positions, different jets, diff idle mix;s etc

tis tres shit

 

It`s the bloody needle!!! change it! tell me what number it is and I`ll tell you number to try. Jeez!

Best guess at the moment is a W-7 fitted?

 

where am i gunna get a needle ?

do you not want to just set my bike up for me