850 Ultra XP lean bogs when secondaries open

joes68340s said

Just bought this carb as soon as i try to open secondaries it lean bogs. Played with jetting running a plug in the rear now throwing jets at it still bogs 408 W2s 12-1 650 solid roller. Indy 360 intake. It idles fine just wont transition . stock jetting 84-84 with 4.5 power valves Im at 88 primary with valve and going to try 98 rear. It just seems excessive.

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The primary purpose of the pump shot is to cover for when the throttle is opened suddenly and vacuum drops to zero. If you disconnect the secondary pump shot and the then open the secondaries slowly it should rev and pick up RPM's without a problem. If it doesn't do that then there is an issue with the transfer fueling.

Pull it apart and make sure nothing is blocked.