IDA tuning help - Lean spike

[Gaz64]

Mark,

You haven't listed pump jet, pump bleed or venturi size.

You also have the "dreaded weber gremlin" - lean condition at 2800-3000 rpm.

But from what you've listed and assuming the choke is appropriately sized for the engine I'd say:

Wrong emulsion tube
Main jet too large
Air corrector too large


There are some EXCELLENT threads on the tuning of IDAs on here,
written by members from their own experience, this info you will not find anywhere else.