I race a 1300 spitfire in SCCA FP with two 1.5 inch SU carbs.
I have done some swapping of dasphot/piston pairs hand now have some that
lift much better than before. As a result of this I am running very rich
with my RC needles.
What needles are any of the rest of you running on your SU carbed 1300 or
1500 engines, with near stock SU's?
When I put the newly acquired used Comptune's on I also run rich. What
needles are any of you using on these modified SU's. It also will not idle
or start unassisted.
I have talked to two people one sys he has no trouble. The other says he
needs to file a flat on the top 0.5 inch of the needle to get it to start
and idle. Does the 45 degree tape on the back of some jets serve this
function?
I realize my cart will be different than yours, I just am interested in a
ballpark needle for starting purposes.
Help
Thanks.
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