High Idle problem, Wax Element Shaft adjustment question (and picture) - Honda Motorcycles - FireBlades.org
Honda FireBlade Discussion of the Honda CBR 900RR, Honda CBR 929RR, Honda CBR 954RR, and Honda CBR 1000RR Motorcycles.

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post #1 of 21 Old 03-13-2013, 11:29 AM Thread Starter
 
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High Idle problem, Wax Element Shaft adjustment question (and picture)

Hello All, new member here and first time working on a 929 and I'm learning quite a lot from this site! I bought this bike for real cheap but it was in non-running condition and it had been sitting for 3 years in a garage. The problem was fuel delivery as it would only start with starter fluid.

Well I bought a used throttle body with injectors from ebay and swapped in the fuel injectors only and put new gas in and she fired right up. Great. But about 5 seconds after she started, the RPM's slowly climbed up to 4500 RPM and held there. I kept shutting off the bike everytime it did that. After the 4th time it stayed around 2000 RPM's and I blipped the throttle to see what would happen and it happened again, it held at 4500 RPM so I shut it down.

I read a lot of people having this problem on here and they mention "adjusting the wax element shaft" which should slow the idle down. Here is one thread in particular: https://www.fireblades.org/forums/gen...-bottom-3.html

Before I try swapping in the other used throttle body, can someone please tell me what part I have to adjust on here to make the RPM's go down? I took a picture of the wax element shaft assembly on my extra throttle body and labeled the screws that I believe need adjusting. I think I'm supposed to be dealing with 1 & 2 right?
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post #2 of 21 Old 03-13-2013, 8:05 PM
 
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Re: High Idle problem, Wax Element Shaft adjustment question (and picture)

I had the same problem last year. Just loosen off the nut at 2 by a small amount. Sorted

You shouldn't adjust point 1 at all. That's set at the factory, and is the "standard" for the other TB's when you're syncing them. That's why it doesn't have the adjuster on the back (point 4) like the others.

When you're loosening off the bolt at point 2, it REALLY helps to have another set of needle nose pliers holding onto the shaft coming from the wax unit to hold it in place.

If the bike isn't braking properly, you don't start by rebuilding the engine.
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post #3 of 21 Old 03-14-2013, 9:15 AM Thread Starter
 
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Re: High Idle problem, Wax Element Shaft adjustment question (and picture)

Thank you for the reply! I just went down and loosened it by 2 turns and I can see the valves closed a bit. I will put her back together and give it another try tonight after work. You were right I had to use 2 needle nose pliers, 1 to hold the shaft below and 1 to loosen nut #2. I will report back.
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post #4 of 21 Old 03-15-2013, 10:26 PM Thread Starter
 
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Re: High Idle problem, Wax Element Shaft adjustment question (and picture)

I went down tonight and loosened it another turn just to be on the safe side. The little valve basically went from 1/4 closed from the start to 3/4 closed and then I put it all back together. VOILA!!!!! Damn you guys are helpful, thank you! Bike started right up at 1200 RPM's and then warmed up at around 1500 RPMS's and then dropped down to 1200 RPMS's once it reached normal temps so all looked normal. I was so freaking happy that I couldnt wait to take it for its first test drive even though the bike doesn't have any fairings or lights on it lol. I had the big wire loom wrapped around the dashboard hoping it wouldn't fall down lol.

The bike runs like a rapped ape and all 6 gears shift flawlessly. Quickest bike I've ever been on for sure. Well now to order my fairings from Asia. Think I'm going with the white/silver repsol theme. Havent seen a 929 with it yet.
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post #5 of 21 Old 03-15-2013, 10:37 PM Thread Starter
 
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Re: High Idle problem, Wax Element Shaft adjustment question (and picture)

For the people that will be curious about this fix on their bikes, I went and took another picture of my spare throttle body to show you where the idle valve is. In this picture you can see the idle valve is closed about a 1/4. The one on my bike was closed only a 1/4 when I was having the problems and the spare one I have came closed only a 1/4 also so I'm not sure what the "factory setting" should be. I unscrewed mine until it was almost 3/4 closed and that fixed my problem. Here is the pic with the red arrows showing the valve that opens and closes the idle intake holes. This is the spare one set at a 1/4 closed
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post #6 of 21 Old 05-06-2013, 7:36 AM
 
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Re: High Idle problem, Wax Element Shaft adjustment question (and picture)

Hi
How many full turns on the nuts did u do?
I tried this yesterday and I turned it a 1/4 of a turn and still the same.
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post #7 of 21 Old 05-06-2013, 8:08 AM
 
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Re: High Idle problem, Wax Element Shaft adjustment question (and picture)

Are you loosening the bolt at point 2 or point 4 in the first post's picture?

If the bike isn't braking properly, you don't start by rebuilding the engine.
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post #8 of 21 Old 05-06-2013, 9:53 AM Thread Starter
 
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Re: High Idle problem, Wax Element Shaft adjustment question (and picture)

Quote:
Originally Posted by Carlos_1977 View Post
Hi
How many full turns on the nuts did u do?
I tried this yesterday and I turned it a 1/4 of a turn and still the same.
I loosened mine by 3 or 4 full turns. I dont think a 1/4 turn would do anything. Can you see the idle valve on yours like I show in the second picture? I loosened the nut on mine until the valve was 3/4 closed.

Also, you should only be turning the nut labeled "2" in my first picture. You will need to hold the shaft underneath with needle-nose pliers while you loosen the nut or else the shaft will spin too meaning you arent actually doing anything.
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post #9 of 21 Old 05-06-2013, 10:51 AM
 
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Re: High Idle problem, Wax Element Shaft adjustment question (and picture)

I am loosening the nut at point 2 whilst also holding the shaft.
I have only done a 1/4 of a turn at the moment and it done it again.
So ill try 2 turns and ill report back with what happens.
My valve is 3/4 closed.
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post #10 of 21 Old 05-06-2013, 11:13 AM
 
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Re: High Idle problem, Wax Element Shaft adjustment question (and picture)

Slacken it off until the high idle comes down. If it still idles high when warm, use the adjuster in front of the left footpeg to bring it down.

If the bike isn't braking properly, you don't start by rebuilding the engine.
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post #11 of 21 Old 05-06-2013, 11:31 AM Thread Starter
 
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Re: High Idle problem, Wax Element Shaft adjustment question (and picture)

Quote:
Originally Posted by Carlos_1977 View Post
I am loosening the nut at point 2 whilst also holding the shaft.
I have only done a 1/4 of a turn at the moment and it done it again.
So ill try 2 turns and ill report back with what happens.
My valve is 3/4 closed.
It sounds like you are doing it correctly then.

Quote:
Originally Posted by Sky91 View Post
Slacken it off until the high idle comes down. If it still idles high when warm, use the adjuster in front of the left footpeg to bring it down.
Forgot about the easy idle adjuster knob, did you try to loosen that first before doing the wax shaft adjustment?

Its this knob seen here, you probably did but here is a pic on Ebay I found so you can see where it is:
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throttlebody1.JPG‎   throttlebody2.JPG‎  
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post #12 of 21 Old 05-06-2013, 12:29 PM
 
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Re: High Idle problem, Wax Element Shaft adjustment question (and picture)

Quick question.
What should the revs go up to when you start the bike from a cold engine, and how long should it be before it settles down?
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post #13 of 21 Old 05-06-2013, 1:35 PM
 
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Re: High Idle problem, Wax Element Shaft adjustment question (and picture)

Hi guys.
I adjusted it 2 turns and it seems to be all good thank god.
I left the bike for about 5 hours come back to it anr started it and it went up to just under 2000 anr then dropped off to 1000ish.
Im gonna try it again in the morning just to make sure.
Happy with that though and this is a very useful thread as it was booked into my nearest honda dealer to fix it so money saved by this Thread.
Many thanks all for the advice.
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post #14 of 21 Old 05-06-2013, 1:43 PM
 
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Re: High Idle problem, Wax Element Shaft adjustment question (and picture)

Quote:
Originally Posted by Hawkes View Post
Quick question.
What should the revs go up to when you start the bike from a cold engine, and how long should it be before it settles down?
About 1800-2000 when cold, then it should start to drop towards normal idle at around 40 degrees.

If the bike isn't braking properly, you don't start by rebuilding the engine.
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post #15 of 21 Old 05-06-2013, 2:21 PM
 
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Re: High Idle problem, Wax Element Shaft adjustment question (and picture)

Quote:
Originally Posted by Sky91 View Post
About 1800-2000 when cold, then it should start to drop towards normal idle at around 40 degrees.
Thats spot on, thanks.
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