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  #1  
Old 5th July 2012
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Default Bike Stumbles with U1097 Code

Not exactly sure if this is the right forum to post this...

07 1200R, bought it used a few months back, with 2400 miles. The bike has the Stage I flash, SE intake and VH Sideshots. When I test rode it, I noticed it had a noticeable stumble between 2-3k rpm, with no or low load on the motor. At any time I am either accelerating or decelerating the bike runs smooth...it's only during part throttle/low engine load/cruise. Rev it over 3k and hold it there and it is only barely noticeable. Over 4k and it runs smooth as ever.

I figured it was a tuning issue and bought the bike anyways.

Got it home and ordered a PCV from FuelMoto. The bike performed even better and the stumble was less noticeable, but still there.

I went for a ride today and got a CEL right after startup...that lasted maybe 10 seconds. Also...I noticed the speedometer needle fluctuates in correlation with the motor stumble...weird eh? I went home and pulled the codes and it has the U1097 code (Loss of Serial Speedometer Data). Oddly enough the tach only deflects only a very small amount during the stumble...

I'm going to the stealership tomorrow to order the electrical diagnostic manual, but thought I'd throw this out there to get any ideas or insight...

Thanks, any help would be appreciated...
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  #2  
Old 5th July 2012
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this is what the electrical manual for the 08 says, but you probably figured that out
"GENERAL
Loss of Speedometer Serial Data
The serial data connector provides a means for the speedo- meter, Electronic Control Module (ECM) and TSM/TSSM/HFSM to communicate their current status. When all operating para- meters on the serial data link are within specifications, a state of health message is sent between the components. A Dia- gnostic Trouble Code (DTC) U1097 indicates that the speedometer is not capable of sending this state of health message. A DTC U1255 indicates that no messages were present during power up of the current key cycle. A DTC U1097 indicates that there was communication on the data bus since power up, but communication was lost or interrupted during that key cycle."
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  #3  
Old 6th July 2012
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Thanks...

It does help, because I had to special order the elec manual as they didn't have it in stock/on hand. It should be here next week.

What is most perplexing is what is common between the two problems; 1) causing the needle deflection on the speedo and 2) the motor to stumble...at the same time. All the while, the tach needle only deflects a small amount (probably only displaying the stumble).

If the motor stumbled anytime between 2-3k, it would be easier...but it only does it when there is no load on the motor. Accelerate, or decelerate at anytime and the motor pulls cleanly...

This would rule out a simple electrical connection...as a temporary short/open wouldn't care about engine load...

Weird...just weird.

I'm going to try and get a ride in this weekend to see if its actually doing it at higher rpms and I just wasn't noticing it...and to ensure it's not at a specific throttle position.

Wish me luck...but, I am a retired USAF avionics troop, so this isn't my first rodeo...
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Old 22nd July 2012
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These bikes like higher rpm's. It's normal. If you shift into 5th at 50mph the bike will surely let you know its not happy. If your cruisin and you can't see out of your mirrors then you need to downshift.
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Old 22nd July 2012
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Quote:
Originally Posted by motorend View Post
If your cruisin and you can't see out of your mirrors then you need to downshift.

Very nicely put!

It's smooth up to about 2500, then it vibes to a little over 3k...then smooths back out. In fact, 65-70 mph (maybe 3300 rpm?) is nice...
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Old 22nd July 2012
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i don't like to cruise at anything below 2800 rpm. i will let it drop to about 2000 on the downshift with no throttle
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Old 22nd July 2012
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My same year/model bike had this stumble too,from stock.
I fitted some SE sp slip ons & it was still the same,I then fitted an SE stage 1 air filter & had to fuel the bike,(I fitted a Dobeck tfi),this sorted out the stumble,but my fuel milage has got worse as I think I'm running a tad rich,(easy enough to adjust).
The stumble on my bike I conclude was due to running lean at small throttle openings,as the Dobeck unit can only add fuel,not reduce it.
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Old 22nd July 2012
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Quote:
Originally Posted by geoff 1 View Post
My same year/model bike had this stumble too,from stock.
I fitted some SE sp slip ons & it was still the same,I then fitted an SE stage 1 air filter & had to fuel the bike,(I fitted a Dobeck tfi),this sorted out the stumble,but my fuel milage has got worse as I think I'm running a tad rich,(easy enough to adjust).
The stumble on my bike I conclude was due to running lean at small throttle openings,as the Dobeck unit can only add fuel,not reduce it.

Makes sense...I think I'll play around with the mapping a bit in those rpm/throttle position tables to see how it affects it.


Thanks to all for the inputs...
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Old 22nd July 2012
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Let us know how you get on,I'm learning too,these 'r's are a nice bike to ride though for sure!
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Old 22nd September 2012
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Update:

Well, I finally had some time to do some tuning...

I cleared the code a while back and haven't had it flag again...don't know why.

However, I was still getting the speedo fluctuation when the motor stumbles...tach still stays steady...

I marked the throttle and housing with some pinstripe, then marked off the 10, 20, 30%, etc position and mapped out a ride that had some uphills, downhills, in town and freeway.

All of the stumbling was happening just right off closed throttle, and between 2000-3000 rpm. So, I upped the 2% throttle tables 2pts between 2k-3k and ta-dah...the stumbling was less noticeable. So, I upped those tables 2 more pts and the stumbling is all but gone and hardly any noticeable fluctuation of the speedo. I checked the plugs when I got home and the front is only slighty tan on one side and the rear cyl is still bone white (I do understand this only reflects the last rpm/throttle position the bike was running, so it's a crapshoot really without doing plug chops).

Tomorrow I'm going to up the front cyl 1 more pt between 2k-3k and 2 pts on the rear cyl.

Even though I'm getting closer, this is only through a butt/ear dyno...which is only an educated guess at best. I can still see a PV happening in the near future...
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