Lurching at low rpms slow speed - Yamaha FJR Forum : Yamaha FJR Owners Forums
 
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post #1 of 5 (permalink) Old 09-16-2019, 03:46 PM Thread Starter
GPM
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Lurching at low rpms slow speed

Recently tried riding up Mt. Washington and my bike, 2007, lurched, lunged, and was ‘bucking’ on that narrow road. I thought I was doomed to fall off the mountain road. Any hints as to what might have caused this? Bike rides fine on highway at speed and around town. Was it the altitude, 6000 feet?
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post #2 of 5 (permalink) Old 09-16-2019, 03:55 PM
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There was a recall way back for the altitude sickness... any dealer can tell you if it was done if you give them your VIN. If you get in that pickle again, just stop shut the bike off and restart, the ECU will refresh.

Ray
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post #3 of 5 (permalink) Old 09-16-2019, 07:58 PM
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If Yamaha says it's too late to get the "altitude" CPU, and you don't want that to happen again, you can perhaps purchase an "altitude" CPU from an 07 on Ebay. {I think they have different serial numbers than the "original' 07 CPU.

If you can only get an 08 Used CPU, I know that year works on an 07 because I put one on my 07 for a while trying to eliminate the on/off switch throttle that bedeviled the 06 and 07 FJR.

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post #4 of 5 (permalink) Old 09-17-2019, 02:32 AM
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I had a 2006 model that had this dodgy TPS problem and I never got round to having it fixed. The solution was that you had to really rev it as you went higher; the sensor wouldn’t adjust to thinner air with normal riding. If you revved over a certain level (briefly, perhaps two or three times) the sensor adjusted itself to the thinner air. There must be a ton of threads from the time relating to the issue.
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post #5 of 5 (permalink) Old 09-19-2019, 03:16 PM Thread Starter
GPM
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Quote:
Originally Posted by RaYzerman View Post
There was a recall way back for the altitude sickness... any dealer can tell you if it was done if you give them your VIN. If you get in that pickle again, just stop shut the bike off and restart, the ECU will refresh.
Thanks for your suggestion. I will call dealer about recall.
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