Explain this, then.

For about a month, my bike has been surging & stuttering on very small throttle openings - typically at 2000 to 3000 revs in 4th or 5th. Felt a lot like when you are running out of petrol on a carbed bike, and need to switch to reserve.

Didn't happen if I revved straight past through 3000 & upwards. No big deal, but a bit of a pain in traffic.

DannyBenson had exactly the same symptoms, and cured it with a replacement TPS.

Went to my dealer & ordered a new TPS (even though his little hand held machine thingy reckoned mine was perfect, just like Danny's dealer did).

TPS would be in stock by Tuesday

So, then went away to Nomads, in France for the weekend, Friday to Monday.

By Saturday, the problem became a lot worse. The stuttering & surging became so bad that the only way to ride it was at big throttle settings, which meant I had to ride flat out, brake hard, flat out again. Fun, but tiring.

On Sunday, we went for a decent ride out to a lake about 40 miles away, and on the way back, by agreement, Nomad really let rip with me following. Rode like a bastard for about 40 miles, never dropping below 4000 revs in any gear, up & down the gearbox, and scraping a good bit of the pegs on constantly twisting roads. - gave the bike a real good thrashing.

I wouldn't have noticed a problem at those kind of speeds/throttle settings anyway, and it was a good laugh to give the bike some serious welly.

Next day I rode home about 500 miles, mainly dual carriageways. On the first 200 miles, I noticed that the bike wasn't stuttering as much. On the last 300 miles, I kept the speed to around 100 to 120mph except for petrol stops.

Sorry to be so long winded about this, but here is my question.

My bike now seems to be completely cured. No stutter, no surging. Not at any speed, not at any throttle setting. Have ridden it every day since my return, and it's perfect.

Does this mean that the problem is sporadic, and may return?

Did the **** good thrashing somehow fix the problem?

Did the bike somehow re-learn a good setting for itself?

Went to the dealer, who has the TPS now in stock, and their advice was that if its running good, don't sod about with it. Fitting of a new TPS has been put on hold for a fortnight to see what happens during that time.

Anyone have any explanations as to whats happened?

Owl, those are the symptoms mine is exhibiting and they are intermittent. I thought for awhile that I had gotten some bad fuel, and perhaps you did, but a fresh tank of premium did not resolve it. The performance went away for a bit and then returned. I parked my Rocket and am awaiting the TPS. I hope it resolves your situation. It seems to have done the trick for many...

Before the techies wade in with a detailed and considered response, how about a batch of contaminated fuel, water for example?

Z

Oops - obviously not quick enough then...

Contaminated fuel I could imagine, but for a month?

I have ridden about 2500 miles with this problem. Surely bad fuel wouldn't hang around in the system for that long.

Have had no loss of power either. As long as I accelerated past 2/3000, no problem would manifest itself - it was only at small & constant throttle settings.

my own problem that I thought was trash in my tank from bad fuel, turned out to be a loose coil connection. Apparently the coil wires have a couple of clips and look like they're making connection when in fact they're only intemitedly making contact..

Could also be a slightly clogged fuel pump/injector.

The thrashing cleared it possibly?

I also have this problem (slightly) at about 2k rpm, bike seems to be "choked" is this a problem those without aftermarket pipes also experience? or is it restricted just to those who do have aftermarket stuff?

is it limited to those with preds even? could it be something like an error inthe tune due to Sam's bike being different to the others??

I never had this before upgrade, but I did have the idle problem which I fixed using the adjusters at the throttle.

not trying to point any fingers here (before anyone gets all upset) I'm just throwing ideas out to see what comes back.


Allan

Tom, do you get your fuel from the same place? :?

fuel,,,not a chance,, sorry usa cousins,,but european fuel is of a higher quality than your stuff, contamination is very rare , infact so rare as to be ruled out completely , its the tps , had the same deal , went on for 6 or 7 weeks before it was sorted by replacement tps ,, get it replaced owl , you will see the mod then , ie the plastic cover i mentioned

Owl: I also think it is the TPS, just from reading all the other posts regarding the irregularity of the issues around the idle and the RPM's. It just seems to follow the same as those other posts with it coming and going!

The only other things I can imagine would be Owl feathers in the gas tank! 8)

Native One