Thruxton Thruxton R Misfire

My 2016 Truxton R with only 1,500kms has developed a misfire problem when the throttle is opened quickly the engine cuts out until I release the throttle and open more slowly then it is mostly OK. Dealer here in Phuket doesn't seem to know what it could be and wants the bike for a week for testing. I don't have so much confidence it the local workshop. Any others had the same problem?

 

Thanks for the advice. It doesn't feel like a weak mixture problem but a complete cut out of the engine. I feel that perhaps a sensor is sending wrong information to the management system or perhaps the ECU has become faulty. It is like serious traction control kicking in. Also it doesn't always do it in normal riding so it feels more like an electrical system fault Just wondering if anyone else has had the same problem on any of the current twins.

 

Thanks for the information. It sounds like very similar symptoms to my problem. Yes its nearly always 30 degrees here. Now it is cutting out and misfiring but not stopping whenever I quickly open the throttle and then revives if I close and reopen slowly but only on occasion under normal riding conditions do I get the severe hesitation. I am grateful for the details. I would have thought that it was an electrical fault. You say several have had the same problem, do you know if all were fixed by resealing inlet manifolds? But is it that they have done the work but its not tested. Fancy a drive to the South??? If this is true then clearly Triumph have a problem that would not just be limited to Thruxtons.
I suppose I am happy I am not alone with this problem.
Thanks so much for the feedback.

 

Thanks for more clarity. Mine was good for a year but it laid idle for a couple of months due to the monsoon season and when I used it after the layup the problem was there. I haven't taken it in for the week of checking yet. That will be next year. I just wanted to do some homework on the problem. I will post the findings after the dealer does his testing. Thanks again for your input
Alan

 

Hi Duke, thanks for the info. I did similar to what you have done to your R and got rid of the Cats and airbox etc. on my earlier Thruxton 900 and then re mapped the ECU when Triumph Phuket couldn't get the thing to run right. The thing is the Thruxton R ran perfectly for over a year with aftermarket exhausts (CAT retained) albeit only 1,500kms and then after a monsoon layup for a few months the problem started. It must be fixable problem. I suspect either a sensor or the ECU failure. I like it that the CAT and the straight through exhausts are not too noisy in fact just right for me.
I will give the dealer a try to fix it but I suspect I will have to mess about with it myself.

 

Wow thanks for the direction a number of people are having a worse time than me with the TT R's. It seems that the problem is exacerbated in the hotter climates USA and Australia. It appears to be a major problem for Triumph. Mine stalls sometimes at traffic lights as well. Mine probably has the original ECU map and needs upgrading. I will let the dealer have the bike in the New Year and see what happens. Thanks again

 

Not yet as I haven't taken it in to the dealer yet as they were snowed under after the holiday and I didn't want my bike just sitting there. Will keep you posted.

 

I got the bike back from the dealer yesterday. They said the main cause of the problem was spark plug caps and that they replaced them with new ones warning me it might happen again as they believe there is a production problem with the caps and HT leads. When testing the bike they heard an arcing around the spark plugs and this pointed them to the problem. I suspect I am not the first with this problem. I have read where several other owners have had the arcing from their plug caps and can see the sparks jumping out of the caps to the head. The bike seemed perfect on the 20 km ride home and none of the previous issues were apparent. They told me they had updated to the latest software but when I checked whether the clock reappeared after switching off and on again as noted by some owners who have the latest software and it didn't. There was no charge even though the bike is over one year old. They said they had claimed from Triumph. They said if the problem reappeared bring it back. I will do further ride testing and see but yesterday it was a dream to ride with no hesitation at any throttle opening.
While the bike was away I ordered an X-pipe from Marcus at Omega in Bangkok after reading many of the RAT forum comments from many owners who de-catted. This is an interesting dyno test to anyone interested.
http://www.triumphrat.net/club-cafe...e-definitive-test-results.html#/topics/798745
I already have great stainless open mufflers and it sounds great but not too loud. I really don't want extra noise but I am interested to see what happens to the performance of the bike when CAT is removed. I will keep you posted.