Stumble or Hesitation on Take-Off - Page 3 - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #21 of 55 (permalink) Old 06-19-2019, 06:11 PM
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Here's a discussion that may be helpful.

http://www.fjrforum.com/forum//index...+%2Bold+%2Bguy
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post #22 of 55 (permalink) Old 06-19-2019, 11:42 PM
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I've got the same issue with just off idle stumble. I've stalled it twice pulling away from a stop. While riding if you roll off and then on lightly, it will start to pick up then stumble ever so slightly. I will try a few ounces of rubbing alcohol to see if it is moisture. I'm not quite sure when it started. I had the dealer replace the plugs and all the fluids a few weeks ago.

David

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post #23 of 55 (permalink) Old 06-20-2019, 12:03 AM
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Thats what is great about belonging to a site like this. So much talent out there and with people willing to share their experience with some of the basic issues(or not so basic) that the dealers cant fiqure out.

Great read from the other site.
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post #24 of 55 (permalink) Old 06-20-2019, 07:43 AM
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So the guy on the other forum with some stumbling issues had bad plugs. Unless they have been changed lately, change them again. LOL

Iridium is your friend. Then don't change them till your gas mileage drops, or 75,000 miles. JMHO
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post #25 of 55 (permalink) Old 06-20-2019, 09:48 AM Thread Starter
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Good point on the plugs, thanks. I'll check them for sure this weekend. Yes and once I have this Red Line cleaner run through, I'll try the seafoam, which seems to do the same as rubbing alcohol. I don't have either, so will be picking up this weekend.

Was hoping to ride in to work today, but now it's raining

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post #26 of 55 (permalink) Old 06-20-2019, 09:57 AM Thread Starter
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Quote:
Originally Posted by Mr_Ed View Post
Here's a discussion that may be helpful.

http://www.fjrforum.com/forum//index...+%2Bold+%2Bguy
@Mr_Ed - thanks for sharing this link! Great information, exactly what I was curious about. Looks easy to do, too.

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post #27 of 55 (permalink) Old 06-20-2019, 12:39 PM
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I run Iridium plugs on all of my bikes. Im in the middle of valve checks now and my plugs looked great but thr stock plugs have opeden up to .037 or so with about 23,000 miles. I have Iridiums on the way.
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post #28 of 55 (permalink) Old 06-20-2019, 09:21 PM Thread Starter
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Just got the service manual tonight. Time to start reading. I'll for sure check plugs, change if needed, and probably just go through it some, basic stuff. The is actually a great bike besides this one problem. Really like it.

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post #29 of 55 (permalink) Old 06-21-2019, 08:28 AM
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Throttle position sensor would be my though. I had a car with a bad one that stumbled on take off.

It was only bad at one position sonif you went past it the car ran fine. Put you bike in neutral and very slowly increase the RPM. If engine stumbles at the same throttle position, then suspect the throttle position sensor.



Quote:
Originally Posted by Joel S. View Post
might be a throttle position sensor,
it will cause bucking and jerking, had to replace mine on my 16 already.

night and day difference before and after replacement.
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post #30 of 55 (permalink) Old 06-22-2019, 09:43 AM Thread Starter
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Hi, I've been reading and searching on the problem and it sure seems like it's this sensor. I got the service manual yesterday. Figured I'd try the Diag mode. I got to the first screen. I didn't see this in the manual and of course I picked the wrong thing: SCU. Then I tried to figure out how to cycle through the codes and I triggered something which sounded like the rear shock was extending/retracting or something. I shut the bike off, it finished doing what it was doing and then I turned it on again. It said error. Shut it off and back on and the error message was gone. I noticed the suspension settings had reset to standard. Do you think I clicked something that reset the suspension to defaults?? Any idea's on what I did?

I did try ECU next and I did get to the "1". Twist the throttle and the numbers go up, but it's jumpy down low, then it smooths out as I open the throttle up. I'm starting to think it's this sensor based on the replies, this jumpiness and googling.
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