Phil....
Usually a carb kit for a specific engine comes calibrated properly for that
specific
engine. From what mfg. did you get the 1.5
SU carb kit?? Was it for a stock or "tuned"
1275? If the latter, what stage of tune,
specifically?
The foregoing having been said,
your easiest approach to this is to call Phil or David Anton at 1-800-APT-FAST
with specifics as to your motor (www.aptfast.com).
Either of these knowledgeable Series A
types should be able to point the way as
to a suitable needle/spring combo.
Cap'n Bob
Mitey Frog
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