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Louie, Technician
Category: Motorcycle
Satisfied Customers: 12461
Experience:  25+ yrs. experience
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1999 shadow ace. when first bought it 4 yrs ago it ran ok

Customer Question

1999 shadow ace. when first bought it 4 yrs ago it ran ok maybe just a little lean. last yr ran worse.
this yr is getting a lot worse. have to have choke part way on to ride. took carb apart. looks very clean. don't think it needs jets because it ran ok with these when i got it. can a leak in a diaphram
cause this? runs great at high speed or heavy throttle. just runs very lean a low speeds light throttle.
Submitted: 2 years ago.
Category: Motorcycle
Expert:  Louie replied 1 year ago.

Hi and welcome back to JustAnswer,

Thank you for the question and your patience. Should you still need assistance for information purposes only...

Initially (if no mods), proposed preliminary checks (if have not been tried) on:

  • • possible pinhole or even tear on the diaphragm (least likely);
  • • airbox, filter (element) particularly cover (likely);
  • • air leak through coupling/boot(s) (most likely);