Correct fuel pressure for dual carbs? Options

[terrymason]

I'm having alittle trouble getting my dual carbs dialed in, the 1st is rich, and the second is lean. My fuel pump was putting out 3.5psi, but the guy I bought my carbs from said I should run 2.6psi instead. What do you guys think?

I've got 60 idle jets and 180 mains, which I thought was overkill, until he told me that I should run 2.6 instead of 3.5 psi.

[rhodyguy]

any other symptoms? snapping/popping back thru the carbs as you open the throttle plates? back fire on decel? my first thought is you've got the droplinks misadjusted if the timing and valve adjments are correct. one droplink longer than the other creating a condition where one carb is 'ahead' of the other. the one "ahead' might be set correctly and the other carb is running lean. don't use the idle speed adj screws to try and correct this condition. it won't work. tearing your carbs apart is the last step when all else fails. get out the cb weber tech book and what ever syncro tool you have, go to the pre dial in settings (the cb book is pretty clear on how this is done), with 1 (leave the other alone for now) idle speed adj screw turn the idle up to about 2k and measure the flow on the front venturis on both carbs. if the flow indicated is equal, go to the troubleshooting guide in the book. the conditions and cures are very well discribed.

k

[terrymason]

any other symptoms? snapping/popping back thru the carbs as you open the throttle plates?

-Yep

back fire on decel?

- No, but my wbo2 gauge reads very lean on decel. My sensor is near the exhaust tip though, so it could be fresh air being sucked in.

I'm using the Dellorto superperformance book, although it sounds like the ideas are all the same.

The passenger (1) side carb seems fine, maybe alittle rich, and the driver side (2) seems lean, and backfires out the carbs. It sounds like you may be on to something here. I'll go back to my book.