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Discussion Starter #1
Hello all,

Recently picked up a 03 R6 with approx 30K km on it.
Rode it home ok. Did a tune up (plugs/oil/air filter).

Started to have the from what i understand classic tps issues, moreso when bike was being ridden in hot/humid conditions and when the fan kicks in.
Cleaned tps sensor. Was ok again for a little bit (maybe 300-400km mixed city/hwy riding).

Issues started again. Figured may as well replace the sensor.

New sensor was ok for another 2-300km.

This past weekend the same bad and bouncy idling/stalling issues popped up again.

Sensor reads in 16-96 range and no other CEL codes.

Has anyone ever really figured this one out?
Battery looks newish and holds charge
 

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UR B-hind Da 8 Ball
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5,842 Posts
You are about in the range that valve clearance issues start showing up (18-20k miles, or 30-35kms). Those issues typically start with idle issues when warmed up, then progress to the point where starting up becomes a problem.

Also you need to verify that your coils are good. Spray some water on the headers when it is acting up and see if any of them evaporate slower than the others. Swap the couple on the slow cylinder with a fast drying one, and see if the issue follows the coil, or stays put.
 

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Discussion Starter #3
You are about in the range that valve clearance issues start showing up (18-20k miles, or 30-35kms). Those issues typically start with idle issues when warmed up, then progress to the point where starting up becomes a problem.

Also you need to verify that your coils are good. Spray some water on the headers when it is acting up and see if any of them evaporate slower than the others. Swap the couple on the slow cylinder with a fast drying one, and see if the issue follows the coil, or stays put.
Thank you sir for the reply.

I will give check the coils this weekend.

What throws me for a loop is that this issue is most pronounced when over 100 degrees C / when the fan kicks in.

Under this threshold, it seems to be okay.

ex. at a light temp will go up, fans kick in, bouncy idle. will start moving, temp goes down to lets say 85 by the next light and idle is okay.
 

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Probably breaking stuff
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Check the brand on your coils too. The '03's had Denso coils and they were recalled for Mitsu coils.
 

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Check the brand on your coils too. The '03's had Denso coils and they were recalled for Mitsu coils.
no they weren't recalled. it was just a service bulletin. and it's long over anyway. if it doesn't have the new coils it going to get expensive really quick
 

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UR B-hind Da 8 Ball
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5,842 Posts
Thank you sir for the reply.

I will give check the coils this weekend.

What throws me for a loop is that this issue is most pronounced when over 100 degrees C / when the fan kicks in.

Under this threshold, it seems to be okay.

ex. at a light temp will go up, fans kick in, bouncy idle. will start moving, temp goes down to lets say 85 by the next light and idle is okay.
Check the charging voltage across the battery at idle when the fan is off and when it is on. Your fan may be pulling too much of a load, or you charging system is failing. The stator and rectifiers on these bikes aren’t the greatest, and there is a high likelihood that there is corrosion on the connectors.

The charging voltage on a good system isn’t much over 12volts at idle, but it shouldn’t drop below 12.

To check the charging system, start with a fully charged battery. Test the voltage across the battery with the bike off, then start it and rev it to 5k rpm. You should be over 14 volts. If not you need to check the components (stator, rectifier and wiring)
 
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