Thread: Updating Carbs
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Old 04-21-2022, 06:49 AM
spdbrake spdbrake is offline
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[quote=Sycraft;1493995]Ok, had car calibrated. Steady speed at all RPMs were at a steady 12.5, but when WOT it goes rich. Has .077 secondaries and I did not have any smaller ones to try. I have ordered and assortment of secondary jets to try a few steps smaller to see what results I get. Car runs great overall and starts and pulls hard, other than being Fat WOT. Secondaries vacuum butterflies are opening, had to lighten the springs to allow them to operate. Any suggestions on what Secondary jetting to try first, AFR is at 11.4 at WOT. I have ordered .075,.074,.072,.070

I'm getting ready to order carbs and jets. Where did you end up on the secondary jet size?
The 1904 has .095 pri, .077 sec jets but since my motor is a 408W I'm thinking I'll start with pair of 1902s which have .095 pri, .095 sec jets. + they're $80 cheaper each as well.
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