danketchpel
Husqvarna
AA Class
Hi, no I am running the best fuel I can find at the moment = Petron Blaze 100 Ron Euro4 grade.
Previously the stumbles and stalls were really dangerous, but I am getting used to the coughs and splutters which occur at around 2100 to 2200 rpm and can usually catch it before it dies now.
I have fitted an O2 sensor spacer and it has made a great improvement, stumbles and stalls are much reduced, but I still get caught out the odd time it decides to die on me.
My question - How can performing a simple 3 minute warm up prior to riding make any difference positive or negative to the running of the bike over the next hour or so?
For my experience the 3 min warm up only served to get past the particularly nasty running just after initial startup. I played with this some and my primary issue was if it died just after startup, say running for 30 sec or so, it was a real beast to restart. So letting it warm up past that point at least allowed it to restart reasonably well and it was slightly more predictable in it's stumbles/fumbles so I could throttle through them ..... for the most part.
You will recall my statement that it took me a while to "unlearn" my riding technique for the bike and to trust it.
I really am not sure about the issue of the bike continuing to run funky throughout the day, or at least more funky. Mine was pretty much always the same in that regard, or let's say the funk remained unchanged.
You are running fuel that is far better than what I get in California, I should be so lucky to have 100 octane Euro grade fuel. The only way to for me to get that is to buy race gas, I'm jealous there....... dang CA commie politicians, grrrr.
To all the guys who have fitted expensive ECU parameter mods, Power Commanders, Wukas, AIT Spoofers, AF-Xied, LC2 etc etc
Thanks for the reports that your bike runs better....SO IT @#%$ WELL SHOULD !!
The KTM 390 Duke has a similarly tuned single cylinder engine with FI and AIT/O2 variable mapping, it runs well where I live (same fuel and same atmospheric conditions) with no mods - BIG QUESTION....WHY?
Haha, you have a point about our bikes should run better after putting in $$$ and effort. Though if you read carefully between the lines some have had issues that continued, but reduced. Charlie still had a few issues with the AF-Xied, others have reported not perfect running with various spoofers over time as the ECU apparently can learn it's way around some of them. I will be honest in that while my bike runs awesome once it's started I'm still chasing an inconsistent cold start situation. It can get it to COLD start pretty well, but in that same period just after it's started to when it's reasonably warm, it can be a beast to restart. Hot start, zero problems. This is a work on progress for me in that regard. My next step is to check the valve clearances just to be certain I don't have a tight valve. I doubt it, but maybe....., I'll have to prove it myself and eliminate the possibility. I tried changing to the Iridium plugs, it didn't change the starting one bit. But I might see about altering the gap a bit to see if that changes anything.
What we all face is not being able to unlock the ECU and reflash it to run properly from the base. My Moto Guzzi Stelvio had a common issue in that it would die at the first intersection after the 1st startup like clockwork, every friggen day. Their cold start mapping was wrong. I had the ECU reflashed and it fixed that BS permanently. It's what the Yamaha Super Tenere guys go through to get that bike to run properly and without restrictions in several gears. My Ducati had similar issues, I have a remapped ECU and it runs flawless now. It's just common. So far my best experiences have come from fully remapped/reflashed ECUs, next after that add-on fuel management systems. If we could unlock the MM ECU on this bike I'm sure some people could make it run RIGHT.
We are all working to find ways to improve it based on what we have available. Very few, maybe a couple, have been satisfied with how the bike ran stock, I sure wasn't, only I accepted it going into the deal, as I had on many other bikes.
Comparing it to other bikes is a waste of your effort. They are simply other bikes. I've ridden so many bikes now that I fully understand they don't all run the same out of the gate, even from the same manufacturer. It often has to do with what it takes to get around the stupid regs and not each bike has the same combustion characteristics even though they "appear" to be comparable engines. For example, the Suzuki Vstrom 1000 ran like crap stock, yet their later Vstrom 650 ran great stock. What they did was improve on the combustion chamber etc. so it burned better, later adding twin plugs etc.
As mentioned, KTM guys have been struggling with several of their bikes, so they finally got it pretty good with the very latest offerings, but it took them a long time, around 8 years or so. Seriously, peruse the 990 Adventure threads on ADVrider under Orangecrush, you'll read endless tails of horrific FI mapping problems. The 690 went through similar issues for a long time, just within the past year or so has KTM ironed out these issues. The 390 is a brand new, clean slate, engine so they could apply all the knowledge gained so far to it. They only introduced FI on the EXC line in the couple years, up to that point they were all carb'd.
I think it's best to see if you can get your's to run well by whatever means seem to make sense for you. If you can't make it run satisfactorily then maybe you will have to move onto another bike, there aren't too many options.
Something that might make sense would be to have the dealer or ??? at least test out any sensors, and possibly the throttle position sensor in particular, to see if they are functioning correctly. I've read through some of the TE 449/501 threads on CH as a buddy of mine has a TE449 that runs like absolute crap (WORSE than my TR) and I'm trying to help him out. One thing those guys have found is to adjust the throttle position sensor from it's stock position to advance it some which fools the ECU into thinking the throttle is open more than it really is basically adding fuel. They have had some positive results from this on those bikes, but I don't know how it might translate for the TR, plus I know it's a royal PITA to just see the TPS, much less adjust it.
We're here to try and help you as much as we can. But I don't think any of us can answer the question why we have had to improve on how it runs, it just is, and there's not much changing that. Husky isn't going to do anything with that bike from now on, it's out of their hands after BMW sold them to KTM.