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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 12-29-2012, 06:00 AM   #1 (permalink)
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EFI Bonnie Running Sick

Hi Guys,

Brand new to the forum, just with a quick browse around the site its amazing to see such a wealth of information on the forum and friendly advice.

I have a small issue with my 2008 Bonneville (EFI), which has just arose conveniently this afternoon, partly the reason for joining the forum.

Here is the issue:

While riding this afternoon after approx 20-30 mins of riding it began to run roughly.

-Struggling to idle once hot
-Losing power either under load or WOT
-Misfiring during acceleration
-Even cutting out when idling.

This is a very new problem, I have owned the bike for 3 years and it has never missed a beat, there are some modifications to the bike which I will list to help a possible diagnosis.

Stock Internals
Nology Hotwires
Nology Plugs
AI Removal
BC Airbox removal (Now 2 K&N Filters)
Standard Headers with short pipes (ending under riders footpegs)

I purchased the bike with the pipes already fitted to the bike, Im unsure as to whether it has had an aftermarket ECU tune-up, however a quick ring around my local area only ended up with one establishment quoting $550 AUD for a tune! And the local dealer unfortunately wasn't much help.

Any information or some basic troubleshooting I can do at home before spending the dollars would be greatly appreciated.

Thanks In advance,

James
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Old 12-29-2012, 06:51 AM   #2 (permalink)
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I would first try replacing those Nology items, the hot wires and the plugs.

The wires have been known to cause all sorts of problems, like shortening the spark plug life, and these bikes should be run on nothing but NGK plugs, type DPR8EA-9 or its Iridium equivalent DPR8EIX-9.

Typical thread about the desirability of NGK plugs:

http://www.triumphrat.net/twins-talk...l-economy.html

Has the ECM ben re-mapped to take into account those exhaust and air intake mods?. It should have been.
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Old 12-29-2012, 07:34 AM   #3 (permalink)
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Quote:
Originally Posted by Forchetto View Post
I would first try replacing those Nology items, the hot wires and the plugs.

The wires have been known to cause all sorts of problems, like shortening the spark plug life, and these bikes should be run on nothing but NGK plugs, type DPR8EA-9 or its Iridium equivalent DPR8EIX-9.

Typical thread about the desirability of NGK plugs:

http://www.triumphrat.net/twins-talk...l-economy.html

Has the ECM ben re-mapped to take into account those exhaust and air intake mods?. It should have been.
Ok, I'll replace the leads and plugs first and see if that leads to some improvement, I would like to ensure it is tuned to suit the modifications, unfortunately I have no evidence of whether it has/hasnt been carried out. Thankyou for the prompt reply , ill let you know how i go
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Old 12-29-2012, 08:08 AM   #4 (permalink)
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Additionally are there any reputable online companies that sell NGK leads with international shipping. The plugs i can obtain locally. Maybe stock leads from the dealer would be better than nology?
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Old 12-29-2012, 08:33 AM   #5 (permalink)
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Quote:
Originally Posted by JRL89 View Post
Ok, I'll replace the leads and plugs first and see if that leads to some improvement, I would like to ensure it is tuned to suit the modifications, unfortunately I have no evidence of whether it has/hasnt been carried out. Thankyou for the prompt reply , ill let you know how i go
I would start by replacing those wires and plugs like Forchetto says, then, regardless of whether that fixes the problem or not, use TuneECU and find out what tune is in there. If remapping is needed you can download the tune from Triumph Twin Power (http://www.triumphtwinpower.com/). However before using TuneECU and doing any remapping I would advise you to familiarise youself by reading the numerous threads on this forum on TuneECU and remapping.

Another thing you should do, IMO is to replace the MAP sensor tubes with 3mm bore silicon tubing. Just make sure, if you do this, that both tubes are the same length, and also the same length as the original tubes. These are well known for causing similar problems that you are currently having.
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Last edited by Ripper; 12-29-2012 at 08:35 AM.
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Old 12-29-2012, 02:26 PM   #6 (permalink)
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Quote:
Originally Posted by JRL89 View Post
Ok, I'll replace the leads and plugs first and see if that leads to some improvement, I would like to ensure it is tuned to suit the modifications, unfortunately I have no evidence of whether it has/hasnt been carried out. Thankyou for the prompt reply , ill let you know how i go
I thought you still had the original cables. Replacement by Factory parts means paying an outrageous price, like $87 for the short connecting lead (Right cylinder) part number T1291650, and a similar amount for the longer one (left cylinder), part number T1291652.

There are alternatives like making up your own if you can locate some quality HT cable (copper cored) at an automotive parts outlet, or buying a set like these at $50 the pair complete with caps:

http://www.newbonneville.com/html/ng...ion_wires.html

These are the standard EFI bike's cables:



Last edited by Forchetto; 12-29-2012 at 02:37 PM.
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Old 12-29-2012, 07:36 PM   #7 (permalink)
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I may have the leads, but worst case scenario. I will track down factory originals from the local dealer, or the NGK equivalent from New bonneville, triumph being triumph particularly in australia the NGK variant from the US is much nicer on the pocket, just a longer wait until they arrive. I have organised some Iridium plugs for the bike today and will change them tonight. Forchetto would you reccomend keeping the bike off the road until those leads and plugs are changed? Then its just a matter of a tune to suit the modifications to improve the rideability. It does run quite rich, Sooty exhaust and plugs. And probably only 180-200Km to a tank.

The TuneECU software also like a brilliant idea, something thats relatively new to me, but it does look reasonably straight forward. It's just a matter of purchasing the cable to connect from your laptop to the bike, and the applicable tune and a good read on the user guide. Any first hand accounts of your experience with the software and ease of use would be appreciated. But im very easily twisting my arm to look into it more seriously, particularly compared to the outrageous prices charged for tuning over here. And the closest is over an hours ride away. Thanks for the help and prompt replies guys, its much appreciated.
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Old 12-29-2012, 08:50 PM   #8 (permalink)
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Don't know if I've read your original post but it seems like this is a problem which has just suddenly arisen for no apparent reason rather than as a result of any of the modifications which have been made, in other words the bike has run perfectly well (although possibly not optimum), if so the tune is not the problem you are looking for a fault which has arisen, plugs and leads are a good place to start and it may also be worth looking at your MAP sensor pipes to make sure they have a decent connection.
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Old 12-29-2012, 09:03 PM   #9 (permalink)
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it appears when you set off on your ride that the bike was running fine,
if so i would check the iat (intake air temperature) sensor, this should of been mounted next to your k&n pod filters, maybe it has come adrift or the wire has been damaged and is giving a false (cold) reading to the ecu which will try to compensate by richening the fueling.
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Old 12-29-2012, 09:11 PM   #10 (permalink)
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I had the same symptoms...ran fine for day and lousy the next. Turns out my plugs were miserably fouled. Replaced them and that was it.
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