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Street Triple Forum Owners and Enthusiasts of the new Triumph 675 Street Triple.

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Old 11-20-2012, 07:00 AM   #1 (permalink)
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Low RPM Stumble

in 2nd gear cruising through town between 4500 and 5000 rpm i am not getting steady power at all, at times the bike is flat out falling on its face.

i don't have any money at all (recently unemployed) so taking it to a dealership is not an option.

when accelerating or cruising above 50mph the bike runs flawlessly, could anyone help me identify the probable culprit of this and long-term side effects i need to look for?
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Old 11-20-2012, 07:02 AM   #2 (permalink)
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it's also taking longer and longer to start the bike, its gotten to the point i have to allow starter cool down time.
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Old 11-20-2012, 09:29 AM   #3 (permalink)
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There is a weird spot in the factory tunes around that RPM because it is where they do most of the EU testing so if is not running perfectly that is most likely where something will show up first.


With the colder weather how is your battery
How old are your plugs
How old is your air filter
Might want to try a 12 minute tune to re-set the TPS adaptation, it should do it itself but with the weather swings this time of the year it may help.

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Old 11-20-2012, 04:11 PM   #4 (permalink)
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Plugs and filter have less than 4k miles on them, battery is less than a year old, last time in tried a 12 min tune the issue went away for a day or so and came back.
I am running the old rectifier but I'm wondering if there's more too this than that

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Old 11-20-2012, 06:37 PM   #5 (permalink)
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I'd say get the R/R replaced under warranty recall ASAP, shouldn't cost you anything. Weird sh*t happens when it starts to go. It was a very hot summer in the USA last year and the old type rectifier may be shot. Usually hard starting or erratic low rpm running may indicate a TPS reset is needed. Also was the little tube going to the absolute pressure sensor (back of air box bottom) re-connected when you had the new plugs installed? I'd say get the new R/R installed and go from there. Good luck finding a new job! - Wayne
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Old 11-20-2012, 06:59 PM   #6 (permalink)
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Thanks Wayne, i changed the plugs, Ive actually had the air-box off since then ill check tonight and make sure the hose is reconnected good thinking, i contacted the local dealer and sent him pics / info about my bike he is going to call me when the replacement rec comes in and ill have it replaced.

How do i do a tps reset?
i did a 12 min tune today haven't rode it yet to see if it helped.

It's time for my family's thanksgiving ride and i am trying like crazy to get this bike running by 6a.m. tomorrow otherwise i'm not going. i don't wanna take the bike on a 400 mile Holiday ride / commute if its not running right.
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Old 11-20-2012, 07:16 PM   #7 (permalink)
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Usually when a re-mapping is done then the TPS reset is then done, but you need TuneEcu or the dealer tech to do this. The 12 min tune is supposed to accomplish the same thing. If you had the airbox off, re-installed, and plugged the electrical connector back in to the Absolute Pressure sensor but forgot to connect the little rubber tube (to the underside of the sensor I believe) then maybe that could cause the problem. Make sure the other two large hoses are connected to the airbox too. Almost time to garage the bike for the winter! - Wayne
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Old 11-20-2012, 07:38 PM   #8 (permalink)
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I ride all year lol
I'll hookup tune ecu and look into the tps sensor when I get home, had to go to school (7 mile ride)

I spent the ride trying to get a better
Feel for the problem it seems its just not running right in first and 2nd with it being more obvious at high rpms in first and low rpms in 2nd however in 3rd - 6th at any rpm it runs fine, even at 2k in 3rd

I'll definatly pop the tank off and check the hoses as soon as I get home
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Old 11-21-2012, 01:10 AM   #9 (permalink)
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I found a brown foamy substance under the mesh inside my air box and moisture above it In the Airbox lid

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Old 11-21-2012, 02:18 AM   #10 (permalink)
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That mesh covers the crankcase breather. Any moisture that's in there will evaporate out then condense on the mesh along with oil vapors creating the goop you are describing. This is normal.... Check your oil just to be sure though. If you had coolant in the oil it will show up on the dipstick as the oil will turn white.

As for your running issue. Wayne is correct there is a weird running issue around those rpms but only with the older maps, at least on my bike. I no longer have any hesitation at those rpms with the latest maps.

The 12 minute tune was a good try as well. It is very possible it's the R/R and I would get it done ASAP. It's also possible the bike is out of synch. You can check that too when you have it hooked to TuneECU. I'd check that and get the R/R done then get back to us. It's not really worth speculating further until the known issue of the R/R is taken care of.
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