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It was a fairly heavy throttle stumble. My driveway enters the highway from a slope, so I need to hit it fairly hard. It's not a casual start from a stop light on flat ground. I'll look at getting a 70x37 set of rods, for #26. Though looking at the spreadsheet, #23 and #26 have the exact...

I think that makes sense. What set this whole thing off was chasing an off-idle stumble. Going from Orange to silver seemed to cure that. And while I'm at it, why don't I lean out the cruise just a little bit more... wait, what is wot doing??? I have the LMA-2 RPM converter. I found an...

I think I was making too big of changes, so I went (almost) back to my last known good tune: 095" primary 104" secondary (this is increased from a 101" I had in the past. 68x42 rods, silver springs The vacuum readings here are 1-2" lower than what my analog gauge shows. In this image, the...

Took another short drive today, still at #18. At cruise, rods down, it's 12.5 to 13.5 part throttle, rods up, it's 10 to 10.5 wot is still 11-13 If I lean out the part throttle, I think it's still going to make wot go even leaner, right?

I went to #18 on the 1406 chart (pretty much right between #23 and #26 on the 1405 chart). It's still in the mid 12s at cruise and rods up, and 13-14 at wot? It pulls really hard though :D When I get more time I'll go back to my previous tune, and make smaller adjustments from there.

I think I agree. I had a pump go bad. When I put the inlet on a vacuum gauge and pumped it by hand, it would show suction, then it would not hold the vacuum. It could move fuel, as long as there was no air in the line. Once it was empty, it couldn't really move anything along. On the new...

Bewy, The large tube in the secondary boosters don't appear to have a restriction like that. Dedicated wideband O2 just past the collector (dual exhaust, with no crossover) No easy way to verify fuel pressure at wot. No pops or stumbles at wot Mechanical pump

Awesome :thankyou: So the primary (ha) source of fuel at wot is the power circuit, with the rods up. That makes sense that when I went to #24, wot got a little leaner. At one point in my testing I ended up at #15 on the 1406 chart (which gave 14ish afr at cruise). Going right to #17, it's...

Hey all. New here, and pulling my hair out over this carb. Some specs: 318, with an eddy 1405 live at 4200', so it should be jetted at least 4% lean. FPR set to 4psi. I've had this carb for about a decade since I last rebuilt it. It was running alright, but I wanted to lean it out a bit at...