Ventilator Air Cleaner help
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Joined: Apr 2019
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From: Chesterfield, MI
Ventilator Air Cleaner help
Looking at a used AC for my 2016 ultra classic. I see several part numbers for the ventilator Ac. The one in question I am looking at has backplate 29700-09. Will this fit mine? What is my throttle body size? 50 or 58
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Joined: Jun 2017
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From: Oklahoma
FWIW, I just bought this breather new... and an extra back plate, because I modify them to do external breathers. My bike (16 RGU) has the stock 50 mm throttle body so I bought the HD#2940017 breather which is the 50mm. HD#2940019 is the 58MM breather. Difference is the hole size in the back plates for matching up to the throttle bodies.
So the back plates I got are HD#29763-09 which are for 50MM, I have one of them sitting on my desk right now. It has 29700-09 stamped on it... but that is not a part number, and I think both back plates, the 50MM (HD#29763-09) and the 58mm (HD#2900038), will have that stamped number on them. Maybe it is a "mold" number, I don't know. But I do know the stamped numbers can be deceiving, sometimes they do match the part number... but sometimes they do not.
The fun stuff, the hole in the back plate (HD#29763-09) for the throttle body, on my 50mm back plates, measures almost exactly 2-1/4" side to side.
So the hole in the 58mm back plate(HD#2900038) should measure about a little more than 2-1/2".
This can get confusing because if you're just converting 58mm to inches, it equals 2-1/4"... and the 50mm back plate's hole measures 2-1/4". I believe this is because the throttle bodies are measured by the throat size, not the size of the flare at the end where these back plate mount.
Measure the back plate's hole for the throttle body... 2 1/4" would be for the 50mm throttle body or a bit over 2 1/2" will be for a 58mm throttle body.
AND like said above, if you know its stock, or not had beyond stage 1 upgrades, its gonna have a 50MM throttle body.
So the back plates I got are HD#29763-09 which are for 50MM, I have one of them sitting on my desk right now. It has 29700-09 stamped on it... but that is not a part number, and I think both back plates, the 50MM (HD#29763-09) and the 58mm (HD#2900038), will have that stamped number on them. Maybe it is a "mold" number, I don't know. But I do know the stamped numbers can be deceiving, sometimes they do match the part number... but sometimes they do not.
The fun stuff, the hole in the back plate (HD#29763-09) for the throttle body, on my 50mm back plates, measures almost exactly 2-1/4" side to side.
So the hole in the 58mm back plate(HD#2900038) should measure about a little more than 2-1/2".
This can get confusing because if you're just converting 58mm to inches, it equals 2-1/4"... and the 50mm back plate's hole measures 2-1/4". I believe this is because the throttle bodies are measured by the throat size, not the size of the flare at the end where these back plate mount.
Measure the back plate's hole for the throttle body... 2 1/4" would be for the 50mm throttle body or a bit over 2 1/2" will be for a 58mm throttle body.
AND like said above, if you know its stock, or not had beyond stage 1 upgrades, its gonna have a 50MM throttle body.
Last edited by Ssitruc; Apr 10, 2021 at 11:18 AM.
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