 Boat and Trumpet Install on IDTP Carbs, Special Tool Required? |
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| DennisV |
  Aug 14 2026, 07:18 AM
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#1
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Senior Member  Group: Members Posts: 994 Joined: 8-August 20 From: Santa Rosa, CA Member No.: 24,575 Region Association: Northern California 
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I am assembly IDTP carburetors. I have trumpets (aka velocity stacks) and also boats (bottom air cleaner connecting piece). Are they both meant to be used at the same time?
If so, how do you tighten the nut (8mm ATF)? I don't see room to get any conventional wrench or socket on there. Is there a special tool required? I'm probably missing something obvious. Top is what I understand to the be stacking order. Below an example of where the nuts need to go.   |
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| mskala |
Aug 14 2026, 07:27 AM
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#2
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R Group: Members Posts: 1,959 Joined: 2-January 03 From: Massachusetts Member No.: 79 Region Association: None
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For me, I got an 8mm deep socket (1/4" drive) and needed to cut it down a bit,
so the end of it is below the top of the trumpet. Then use a 1/4" extension on that. It helps to be either a wobble extension or at least fairly 'loose'. |
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| Retroracer |
Aug 14 2026, 10:07 AM
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#3
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Senior Member Group: Members Posts: 665 Joined: 7-July 13 From: Bend OR Member No.: 16,100 Region Association: Pacific Northwest
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Looks like your assembly / stack up is correct. An articulated or semi flexiblle socket extension is whats required for tightening.
All with the added fun / excitement during assembly that a dropped 8mm nut will be heading straight into the carb throats! - Tony |
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| sixnotfour |
Aug 14 2026, 12:41 PM
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#4
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914 Wizard Group: Members Posts: 11,312 Joined: 12-September 04 Member No.: 2,744 Region Association: NineFourteenerVille 
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gold Trumps are oem for sixes..
Attached image(s) 
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| Ninja |
Aug 14 2026, 01:17 PM
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#5
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Member Group: Members Posts: 275 Joined: 25-September 25 From: Granbury Texas Member No.: 29,004 Region Association: Southwest Region |
I use new "nylocks" for any fastener inside an airbox.
These may not be "original" in this case. The possibility of a nut loosening up and then making it through a carb at speed makes "correct original" a non-starter for me. 1/4" sockets can be had short, mid-length, and deep. That application looks like it needs a mid-length socket with a wobble extension to me. One possibility: https://www.amazon.com/GEARWRENCH-Drive-6-P...sr=8-1&th=1 Wobble extensions https://www.amazon.com/Capri-Tools-4-Inch-E...sr=8-3&th=1 |
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