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post #1 of 23 (permalink) Old 07-26-2007, 04:30 PM Thread Starter
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07 thruxton engine issues

I am experiencing some issues with my new Thruxton that are causing me some headaches, so I am looking for some suggestions. Here is my info and the issues.

Mileage: 2300


After a long day of riding over 500 miles, I took off from my last gas station and noticed that the tach was red lining the bike in every gear. I was not purposefully trying to red line, the tach was just reading way over the normal range I was use to seeing. I pulled over and the bike died, as I watched the tach dive way down below 1K. Did a restart no problem and noticed that the idle was not smooth (fluttering up & down around 1200 to 1500 rpm's and no amount of fine tuning was doing the trick. The bike also had a totally different exhaust note (very ratty) when I gave it a little throttle. I have done zero engine mod's and the bike is completely stock. I was able to make it the 50 miles to home, where I checked out a number of things on the bike and found nothing that stood out. Up until this last 50 miles the bike performed flawlessly. Any ideas? I have contacted the dealer and made an appointment, but it's 3 weeks out.

Appreciate all input.
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post #2 of 23 (permalink) Old 07-26-2007, 05:41 PM
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Hope I dion't repeat any of your previous checks - its always hard to do an anlysis when your not right there but heres a few ideas. Check the plug leads at both the plug and coil - sometimes they work loose. Check to make sure no rubber plugs have blown off, cracked or fallen off the the carbs/intakes. Make sure the connection of the main harness to the ignitor box is secure. Pull the floats and see if theres crud and make sure they are not sticking. The sudden very ratty exhaust sounds like it may be running on 1 cylinder for some reason. Good luck

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post #3 of 23 (permalink) Old 07-26-2007, 08:08 PM
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I agree with Thux-ton-up. Do that then also pull both plugs and turn the engine over to see if both plugs are getting good juice.[this will also be a good time to inspect the plugs for discoloration.] Now let's work the gas side of the equation. Pull your fuel line and open the pitcock and pour some gas into a CLEAN glass container and look for impurities like paint, rust etc. If that's ok ....gently drive to the nearest GOOD gas station and put some premium in her and drive GENTLY[under 4000rpm] around for 30 to 50 miles. If you got some bad gas on your last fill-up she'll spit the old gas out and start purring like a kitten. Working refineries for 15years sometimes a batch can get contaminated and foul things up. Hope this helps.

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post #4 of 23 (permalink) Old 07-27-2007, 01:34 AM Thread Starter
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Thanks for the advice


Appreciate the look for's. I will begin servicing her asap. What are some further sign's to look for that she is having an internal engine issue, such as a bad cylinder? During those last 50 miles she seemed to cruise down the road just fine, except for the fact that at 75 miles per hour the tach was reading 75K approx. I had plugs in so I did not notice the ratty sound until it died on the first stop light and started it back up. This is my first air cooled engine, besides old 2 stroke mx bikes so I am appreciative of all advice.

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post #5 of 23 (permalink) Old 07-27-2007, 11:19 AM
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Warranty issues can get messed up if you tinker with it. I suggest you bite the bullet and just leave her sit until your appointment. It's likely something simple and easy like the crank sensor, but you don't want to have the dealer turn you away because you touched it first.

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post #6 of 23 (permalink) Old 07-27-2007, 02:22 PM
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What's weird is that the tach was reading 7500rpm at 75mph (I assume this was in 5th gear). 7500rpm in 5th gear should have the bike moving well over 100mph.

So my initial thought was clutch slippage, but since you're having these other issues and the tach is electronic, I'm wondering if you're having ignition problems. You may need to replace your coil and/or igniter box.

Please keep us updated on what the dealer diagnoses.


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post #7 of 23 (permalink) Old 07-27-2007, 03:12 PM
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Just an idea - but what happens when the TPS is out of range on this bikes? I'm use to dealing with a TPS on mid 1980's Ford turbo 4cyl cars and a faulty TPS or one that's out of range causes simular issues as to what he's describing.
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post #8 of 23 (permalink) Old 07-27-2007, 06:27 PM Thread Starter
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Keep'em coming

Thanks again for the continued suggestions. I will claim ignorance and asked what is a TPS? And has anyone who had a bad coil or igniter experienced similar issues?
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post #9 of 23 (permalink) Old 07-27-2007, 06:44 PM
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A TPS is a Throttle position sensor...
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post #10 of 23 (permalink) Old 07-28-2007, 07:23 PM
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Your ignition module needs to be replaced. My tach quit altogether and, after ignoring my suggestion, they fitted a new tach. Same problem. Two weeks afterward, they changed the module, and life was good.

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