Idle speed adjustment - VTXOA
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post #1 of 9 (permalink) Old 06-11-2019, 02:33 AM Thread Starter
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Idle speed adjustment

The idle adjustment thumbscrew/cable system has no effect on the idle speed of my 2005 VTX 1800 F25. I can run it all the way in or I can unscrew it until the needle valve comes out of the threads in the throttle body and it has no effect on the idle speed, which is way too fast at 1600 rpm. Is there a rebuild or replacement kit for this assembly or must I replace the throttle body?ⁿ
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post #2 of 9 (permalink) Old 06-11-2019, 06:08 AM
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Welcome from Daytona Beach, enjoy and ride safely.
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post #3 of 9 (permalink) Old 06-11-2019, 06:58 AM
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Check vacuum hoses for cracks/splits on the ID. Air gives it the fast idle.
The wax valve controls cold start high idle which is on the throttle body.
Usually corrosion causes the problem, cleaning usually clears the problem.
A link to the thread in the Step by Step board with a PDF attachment.
https://www.vtxoa.com/forums/97-1800...links-pdf.html

Are you in NC? Helms is a popular name in NC.

2005 1300c Red, Mustang seat, HK 2.5 straights. Leds for safety-front & back. 193,118 VTX miles

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post #4 of 9 (permalink) Old 06-11-2019, 07:18 AM
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Quote:
Originally Posted by Eddiehelms53 View Post
The idle adjustment thumbscrew/cable system has no effect on the idle speed of my 2005 VTX 1800 F25. I can run it all the way in or I can unscrew it until the needle valve comes out of the threads in the throttle body and it has no effect on the idle speed, which is way too fast at 1600 rpm. Is there a rebuild or replacement kit for this assembly or must I replace the throttle body?ⁿ
this happens all to often.....

as Hans said its the WAX Valve.... it controls the FAST ( cold ) idle
reason idle adjustment does not work...

it can stick in cold state or hot state...
it is heated from the cooling system and mounted behind the throttle body.

I rebuilt mine 2 years ago..


beside we both have a 2005 "F25".. so they are 14 years old..
I got mine New. 2/2005.
86,000 miles an still cruising.
.



2005 VTX1800 F, type II, Silver Tribal, 88,000 Miles, Purchased Feb, 2005.
MTC clutch & springs.. K&N Air Filter. Garmin 2597 GPS.

Last edited by chuck_VTX F; 06-11-2019 at 07:21 AM.
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post #5 of 9 (permalink) Old 06-11-2019, 06:16 PM Thread Starter
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Just got this bike running yesterday. I've had it for 3 weeks. It has been in a basket since 2014. This is my first V twin and my first Honda so this is a learning experience for me. Have had 9 bikes over the years and all were Kawasaki. I bought the Clymer HONDA VTX 1800 series manual and it has been a great help. I am not familiar with the WAX valve but I'll look it up and git er done. Thanks. Oh, if I put my finger over the hole where the idle adjustment needle valve opens toward the breather assembly, I can lower the idle way down, like 500rpm. Is that supposed to just have an open hole their or am I missing something? The air that is making the bike idle fast is going in right there cause I can close that hole with my finger and idle it down. You can hear the vacuum at that hole. That's what caught my attention. I have been unable to find a good schematic of the throttle body and the idle valve.
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post #6 of 9 (permalink) Old 06-11-2019, 06:45 PM Thread Starter
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Clymer doesn't mention WAX VALVE. It does show STARTER VALVE mounted on rear of throttle body adjacent to the idle adjustment valve. Is this what you are talking about and just using a different name?
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post #7 of 9 (permalink) Old 06-11-2019, 06:47 PM Thread Starter
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I am in New Mexico. Born and raised in Kermit, Texas, 85 miles from here.
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post #8 of 9 (permalink) Old 06-11-2019, 07:48 PM
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wax valve, starter valve.. same thing...

its a chamber with a needle .. and the wax is heated .. moving the needle..
.
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2005 VTX1800 F, type II, Silver Tribal, 88,000 Miles, Purchased Feb, 2005.
MTC clutch & springs.. K&N Air Filter. Garmin 2597 GPS.
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post #9 of 9 (permalink) Old 06-12-2019, 09:45 AM
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There is also air screw synchronization as mentioned in the Service Manual.
https://www.partzilla.com/catalog/ho.../throttle-body

Fleabay has numerous pix of throttle bodies
Attached Files
File Type: pdf Honda Programmable FI - How it works.pdf (1.51 MB, 2 views)

2005 1300c Red, Mustang seat, HK 2.5 straights. Leds for safety-front & back. 193,118 VTX miles
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