Uneven exhaust note - Yamaha FJR Forum : Yamaha FJR Owners Forums
 
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post #1 of 7 (permalink) Old 08-15-2019, 06:14 AM Thread Starter
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Uneven exhaust note

2008 AE72000 miles, valves checked at 50k,
Iím beginning to notice a uneven or burbling exhaust. Not enough to alter speed, but noticeable at virtually any rpm when throttle is held steady. Almost sounds like itís got a performance cam. Bike is still stupid fast, idles fine, smooth acceleration. Just finished a 1500 mile ride up to North GA and back to FL. No issues whatsoever (besides Lowndes County Sheriff)
Any thoughts? Thanks!

Bill P.
2008 FJR1300 abs
1980 XS650 Special II
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post #2 of 7 (permalink) Old 08-15-2019, 07:30 AM
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Spark plugs.

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post #3 of 7 (permalink) Old 08-15-2019, 08:06 AM
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Spark plugs, as Bernie says.... I'll add... spark plug wires. Over time, you pull spark plug wires to do service or due to age and vibration, the connections become loose. Remove the spark plug adapter from the wire (unscrew and pull), clip 1/4" off the end of the wire, spread the strands, screw and push the adapters back on the wires.
MAP sensor vacuum hose, if you have idling problems... remove and ensure it is clean on the inside and the nipple on the MAP sensor isn't blocked with a waxy substance.

Ray
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post #4 of 7 (permalink) Old 08-15-2019, 07:20 PM
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What's your idle set at? Is it the same as "before" the valve check? If following the above advice, check the little rubber caps on the throttle bodies. I'd just replace them without inspection, 5/16" caps at O'Reilly's. They tend to dry rot over time and suck a little air. Was a TBS done following the valve check?

Or simply ride more & stress less.

Russ
2007A

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post #5 of 7 (permalink) Old 08-15-2019, 11:33 PM Thread Starter
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Thanks for all the input. Plugs were replaced during valve check. Iím pretty sure that my idle hasnít changed. Iím going to follow up on the spark plug wires. TBS is definitely on my mind but really havenít been convinced enough to buy a gauge set. Again, I appreciate the input from everyone. 👍

Bill P.
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1980 XS650 Special II
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post #6 of 7 (permalink) Old 08-16-2019, 05:24 AM
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Shoot. My 2018 fights viciously to hold idle. You hear all kinds of bobbling and burbling. If you watch closely, you can see the needle wavering. More noticeable with the yoshis. Not exactly what you report, but itís had me curious. My 14 didnít do this.

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post #7 of 7 (permalink) Old 08-16-2019, 10:46 AM
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One thing to do is ensure you don't have water in the fuel (phase separation). Try some Seafoam or even just an ounce or two of isopropanol (component of Seafoam) to take care of any potential water. Doesn't take much water at the bottom of the tank to cause idle issues.
Once eliminated as a cause, then you can move on to other causes if you're still having issues.

Ray
Keep yer stick on the ice....
2014 FJR1300A - Root Beer (sold)
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