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Old 05-14-2015, 05:31 PM
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Location: new glasgow, NS
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Ultima R1 ThunderJet 120" sea level jetting help

Got 500 miles on the Ultima 120 with stock jetting at sea level. 80 main, 31 intermediate and a 46 air bleed. Seems rich throughout most, if not all, of the range. Just a shade under a full turn on the idle mixture screw. I'm looking for specific jetting info from someone with experience with this set up with a thunder jet. I have one to install along with the S&S large jet assortment so all my bases should be covered that way. Also wondering if the R1 air bleed jet is interchangeable with the main jets or do I need to buy Ultima air bleed jets? The motor is in a '97 E-Glide with V&H Dresser Duals and White Bros. Porker slip-ons. Looking forward to your advice and experience.
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Old 05-17-2015, 03:21 AM
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Turns out the S&S main and R1 air bleed are the same thread size. So here is what I ended up with. 78 main, 72 airbleed, 33 intermediate and 120 in the thunder jet. Started out with 74 airbleed and 32 intermediate but had light ping during transition. 33 is the biggest intermediate I have but I think a 34 would be perfect. The air bleed is the most confusing because the TJet instructions use Mik sizes and the Ultima instructions are wrong. So I'm scouring the forums trying to find a ratio for main/airbleed. Does my setup sound close to what any of you are running?
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Old 09-13-2020, 11:18 AM
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I'd lower the Thunderjet to 100 and increase air bleed jet to 74. This allows the main jet to come in later, and you wont get the hesitation between the intermediate and main jet.
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