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October 24th, 2013, 11:57 AM   #1
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570 - different levels of aggression

Hi,

Sometimes my 570 is aggressive and revvy and it has the POP of a high-compression big-bore single, it's aggressive and clearly powerful - and sometimes it's a bit milder. Softer, a little less revvy, reminescent of my docile DR-Z. It seems to vary between starts of the bike - it was mild, then I goofed a clutch action and stalled it, started it up again and it seemed more aggressive. I think I'm not imagining it, but I could be of course.

I'm wondering if it's the ECU doing something, maybe a signal it's reading varies more than it should (corrosion in sensor leads etc.). Or the map switch is intermittently jumping between soft and hard.

Has anyone encountered something similar?

In trying to eliminate the switch being the cause - Is the difference between aggressive and soft noticeable in the intake/exhaust sound and the engine character in free revving?
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October 24th, 2013, 12:39 PM   #2
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Re: 570 - different levels of aggression

Ok, wild speculation: what if your stall sent back a small chock wave that cleaned up your injector?

I clean my injector every 15 h by blowing compressed air through it the wrong way (while keeping it open using a 9V battery). After that my 570 is much snappier and the front wheel lighter. I believe ethanol-water goo is clogging up the injector over time.


Regarding the switch. Yes, I can hear the difference in aggressive and soft map while revving it. It's also easy to feel the difference while driving. On my 390 it wasn't much of a difference.
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October 24th, 2013, 01:35 PM   #3
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Re: 570 - different levels of aggression

Interesting!, thanks. I'm looking forward to going over the bike during winter, cleaning everything, tightening it up, adding fuel filters if needed etc.
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October 24th, 2013, 07:34 PM   #4
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Re: 570 - different levels of aggression

I noticed something similar on my 390 when it started to run lean, or was fairly hot... seems to vibrate more and sound rougher, and snappier. possibly giving you the feeling that the bike is more aggresive. This has happened to me when my tps gave out and like jon said... injector clogging, which should be accompanied by lots of backfire...could also be any other sensor in the efi affecting performance...

But maybe you are experiencing something entirely different....
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October 26th, 2013, 09:06 PM   #5
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Re: 570 - different levels of aggression

Let your ECU adjust to the elevation by starting and letting it idle for 5mins, and shut down, and restart and ride.

Also, you can unplug your mild/wild switch with just 1 connector behind the mask. Leave it unplugged and see if anything changes.
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October 28th, 2013, 11:31 AM   #6
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Re: 570 - different levels of aggression

Originally Posted by Rensho
Let your ECU adjust to the elevation by starting and letting it idle for 5mins, and shut down, and restart and ride.

Also, you can unplug your mild/wild switch with just 1 connector behind the mask. Leave it unplugged and see if anything changes.
Will do!, thanks!

Been too busy to ride, but took it out tonight. I'm pretty sure that that stall loosened something in the front wheel - it has a desire to raise itself, and will do so if provoked!
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November 2nd, 2013, 09:51 AM   #7
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Re: 570 - different levels of aggression

I think it just needed to be ridden.
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