Warm idle adjustment - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #1 of 4 (permalink) Old 08-02-2020, 08:59 AM Thread Starter
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Warm idle adjustment

Hey everyone,

I recently had Ivan flash my 2006 FJR ECU and part of his take home instructions include increasing the warm idle speed to 1150-1200 rpm to get the volts at the 'yellow wire' in your ECU up to 6.9v. I've turned the screw as far as it will go and when I let go it unwinds/snaps back and I feel like I'm going to break the thing off if I keep trying to tighten it. My current rpm is around 1100 (which is ok) but Ivan is looking for 6.9v at the yellow wire and mine is 5.2-5.4v.

So two questions for those of you who know WAY more than me about this:
1. Am I measuring voltage at the correct location? (see attached pic)
2. Is there a way to increase the warm idle adjustment more?

Thanks in advance.

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post #2 of 4 (permalink) Old 08-04-2020, 09:03 PM
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I can only suggest how to perhaps increase the idle speed...... you can see the spring-loaded throttle mechanism on top of the throttle bodies... follow the rubber tube up from the idle adjust screw, check the mechanism is clean, etc. I don't have one in front of me (no FJR any more), and can't remember if there is an adjustment screw that might give you more range, perhaps not.
You also may have reached the limit in part because of where the throttle sync screws are set. Maybe take the opportunity to re-do the sync, but first remove all the screws, clean the tapered tips, maybe spray some Seafoam or other solvent in the passages.... careful, check the parts diagram for a sync screw, don't want to lose the little spring, o-ring and teeny brass washer.
Next, reinstall all the sync screws to minimum 3/4 turn out, maybe set reference #3 at 7/8 turn out (at 1 turn out, it tends to get loose, you could stretch the little spring I suppose. All it does is provide friction force). Now sync all the rest at 1100 rpm. You may find you have a little more range.
To test the Ivan theory on the yellow wire, if you manually move the throttle to a higher rpm, does that voltage increase? I know nothing about which yellow wire.....

However, there is an idle adjust screw on the wax motor mechanism where you can increase the range.
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post #3 of 4 (permalink) Old 08-05-2020, 09:21 PM Thread Starter
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Thanks for chiming in. I was beginning to feel all alone with the question. I'll start by checking the voltage and go from there. Appreciate the advice!

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post #4 of 4 (permalink) Old Yesterday, 10:38 PM
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Although Ivan is on Vacation for a month, have you reached out to him regarding this?

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