dellorto phbg question

Alan Jackson /
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I have a phbg 21mm on a 73cc reed kit

im far too rich at 1/8 to half throttle even with needle on top notch and a 30 pilot jet

someone has fitted a w16 needle which could be the problem - im about to change it to a W7, and the atomiser is a 262 AU.

I noticed the W16 needle is the same diameter as the W7 for the top half of its length and its only the taper that goes thinner hence richer.

my question is, at 1/8th throttle am I actually on the taper? ie is that metering my fuel at such a small throttle opening? or is it down to the atomiser which need changing for a smaller one.

I suppose I can wait till the W7 needle arrives but I could also order a smaller atomiser.

last question, is there much difference in atomisers should I go one size down to a 260 or will that not make much difference.

I can get the bike running fine at wot its just 4 stroking like mad on part throttle.

cheers

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Subject Written By Posted
  dellorto phbg questionTopic by: Alan Jackson Alan Jackson 01/17/19 11:38AM
  Re: dellorto phbg questionRe: Dirty30 Dillon Dirty30 Dillon 01/17/19 11:42AM
  Re: dellorto phbg questionRe: Alan Jackson Alan Jackson 01/17/19 11:51AM
  Re: dellorto phbg questionRe: Probably Fred Probably Fred 01/17/19 12:13PM
  Re: dellorto phbg questionRe: Alex hernandez Alex hernandez 01/17/19 01:00PM
  Re: dellorto phbg questionRe: Alan Jackson Alan Jackson 01/18/19 11:14AM
  Re: dellorto phbg questionRe: Alex hernandez Alex hernandez 01/18/19 11:28AM
  Re: dellorto phbg questionRe: pat splat pat splat 01/18/19 11:19AM
  Re: dellorto phbg questionRe: todd amundson todd amundson 01/18/19 11:24AM
  Re: dellorto phbg questionRe: Michael Forrest Michael Forrest 01/18/19 11:34AM
  Re: dellorto phbg questionRe: Alan Jackson Alan Jackson 01/18/19 01:25PM
  Re: dellorto phbg questionRe: Alan Jackson Alan Jackson 01/18/19 03:30PM
  Re: dellorto phbg questionRe: Michael Forrest Michael Forrest 01/18/19 08:05PM
  Re: dellorto phbg questionRe: Alan Jackson Alan Jackson 01/19/19 03:28AM
  Re: dellorto phbg questionRe: Michael Forrest Michael Forrest 01/21/19 01:04PM
  Re: dellorto phbg questionRe: Alan Jackson Alan Jackson 01/21/19 02:14PM
  Re: dellorto phbg questionRe: Michael Forrest Michael Forrest 01/21/19 06:21PM
  Re: dellorto phbg questionRe: Alan Jackson Alan Jackson 01/23/19 03:03PM
  Re: dellorto phbg questionRe: Alan Jackson Alan Jackson 01/26/19 05:16AM
  Re: dellorto phbg questionRe: Graham Motzing Graham Motzing 01/23/19 09:21PM
  Re: dellorto phbg questionRe: Michael Forrest Michael Forrest 01/23/19 06:19PM

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