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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 12-03-2012, 06:17 AM   #1 (permalink)
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2012 Thruxton - Low rev cutout

GDay,
Got a new Thruxton last Wednesday (28th) and have nearly had the bike a week but notice some strange behaviour I've never experienced before. I've ridden moto-x and road for a while and this is a bugger of a gremlin.
Okay the history, I bought it new a week ago with BC predators, air box removal, air injection removal and has been remapped. No other engine mods or control mods. Bike ran 12km in stock form. I'm breaking it in, have only taken it to 4000rpm but have loaded the engine slightly getting there. All good.
The gremlin is when I slowly open the throttle and advance about only 200rpm, there is a small relay type 'click' and the motor sputters, sometimes coughs, and often stalls. When you go beyond this lower limit all is well. It just makes taking off slowly a pain and often I have to restart the bike! I've since just grabbed it by the collar and take off at higher rpm to avoid this danger zone. It does get dangerous in car parks though so want to know if this is normal?
Contacted dealer today, wont hear back until tomorrow (this is Australia after all
Cheers, great bike, i look forward to getting to know some of you characters.
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Old 12-03-2012, 08:33 AM   #2 (permalink)
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Suspect you have an inadequate tune map to take into account airbox removal.

I've just this morning replied at length to a very similar problem from another Australian...

See post 4 on this thread:

http://www.triumphrat.net/twins-talk...x-removal.html
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Old 12-04-2012, 02:39 AM   #3 (permalink)
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Quote:
Originally Posted by Forchetto View Post
Suspect you have an inadequate tune map to take into account airbox removal.

I've just this morning replied at length to a very similar problem from another Australian...

See post 4 on this thread:

http://www.triumphrat.net/twins-talk...x-removal.html
Thanks mate, will contact dealer to find what map they used. I ordered the bike with the performance kit so they should have had an idea what map it would need.

Thanks for the heads up mate.

Peace from Australia

Last edited by MacBinary; 12-05-2012 at 11:50 AM.
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Old 12-04-2012, 04:42 AM   #4 (permalink)
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Check MAP sensor hoses
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Old 12-04-2012, 05:47 AM   #5 (permalink)
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Quote:
Originally Posted by MacBinary View Post
Thanks mate, will contact dealer to find what map they used. I ordered the bike with the performance kit so they should have had an idea what map it would need. If the map is wrong, and the bike is running lean, then I'll post the dealers details here. If this is the case they should not be selling the map for the performance upgrade which in turn is damaging peoples bikes, shortcuts p!ss me off, like I'm sure consumer affairs will p!ss them off!

Thanks for the heads up mate.

Peace from Australia
Triumph doesn't recommend air box removal. Therefore, they do not offer a map for that option.
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Old 12-04-2012, 07:50 AM   #6 (permalink)
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You might need to remove and disable the o2 sensors. I had similar problems with a custom tune but with o2 still in place. Went for TTP tune with o2 removal, problem solved. Check out discussion on TTP site.
Cheers Simmo
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Old 12-04-2012, 10:20 AM   #7 (permalink)
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Thanks

Cheers for the info lads.
Dealer got back to me and told me to increase my idle rpm to 1100 which sounds more like a band aid. Don't think this would solve the issue of it possibly running too lean.
It seems to be AI solenoid related. Question is, removing the solenoid and replacing with suitable load should fool the computer, but what is actually causing the motor to cutout? Is this to do with the actual mapping?
Thanks in advance.
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Old 12-04-2012, 11:14 AM   #8 (permalink)
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Have a look at the thread below, especially the video on post 6. Does that sound like your problem?:

http://www.triumphrat.net/twins-tech...ing-noise.html
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Old 12-05-2012, 11:25 AM   #9 (permalink)
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Mac,

Do yourself a favor, purchase a Pieman tune, follow the steps for install and go ride.

You're experiencing, at least from what I gather, an off-idle hesitation.

You could try an reset adaptations and see if that cures your problem, but chances are you'll be chasing your tail on a crappy tune.
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Old 12-05-2012, 11:48 AM   #10 (permalink)
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Quote:
Originally Posted by Forchetto View Post
Have a look at the thread below, especially the video on post 6. Does that sound like your problem?:

http://www.triumphrat.net/twins-tech...ing-noise.html
To a certain degree, yes. I will video the event tomorrow after work as its 11:44pm at present and the neighbors dont hate me yet.

My bike tends to idle okay without the clicking but hover at a certain rpm and its on like a cricket orgy. It will splutter and sometimes stall, which is bad in first gear in a carpark. Dealer suggested increase RPM to 1200 idle, but this just raised the idle over the troubled band and hasn't really solved the problem. Plus the motor doesn't 'rev', it more spools down, and sounds rather tarded.

I will video it tomorrow night as it will clear a lot up.

Thanks again for the time you blokes have taken to offer advice. It really is appreciated.

Sean Mac

Last edited by MacBinary; 12-06-2012 at 01:39 AM.
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