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Old May 27th, 2015, 04:52 PM   #21
GR8
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Originally Posted by BlueSwede View Post
Nope, not with mine. It is civilized and steady at low speed. I only have surging if I whack it WFO, and then chop it back quickly, which I can understand/accept, because I am kind of giving the motor mixed signals...
I thought the same thing.
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Old May 27th, 2015, 10:28 PM   #22
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Originally Posted by appliance821 View Post
It seems fine - not Honda fine but Ducati fine. no problems. I'll say it again - it's a machine that responds well to precise decisive inputs. If your wrist is twitching, the bike is twitching.
The problem is that with 2mm of freeplay in the throttle, it isn't a twitchy wrist that's going to cause a problem , it's every bump or stone in the road if the throttle is really so sensitive.

I'm a very experienced rider that's had upwards of 10 bikes over the last 20 years and i can't think of a single one that exhibited quite this behaviour. My first 5 bikes were all off roaders/dual sports where you learn good throttle control riding on wet clay, woods etc.

It is however the only bike i've had which is ride by wire. That means there is one variable i can't eliminate from the equation myself by adjusting cables and freeplay.

Anybody reading this shouldn't be put off the HS though. I've covered more miles in the last 3 weeks that i did on my previous bike in 10 months. The bike is all day comfortable for me and really is loads of fun. I tell everyone who asks that in terms of feel and riding position it feels just like a big dirt bike to me which is probably why im so happy riding it.

Last edited by HyperPhil; May 27th, 2015 at 10:35 PM.
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Old May 27th, 2015, 11:15 PM   #23
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Originally Posted by bigfoot View Post
I disconnected the cable on my exhaust butterfly two days ago and although I didn't do it to solve surging it has made a huge difference.

Two minute mod so worth a try. Under the centre stand on the exhaust there's a small cover with two 10mm AF screws holding it on. Take these off and rotate the butterfly valve clockwise against its spring to loosen the tension on the end of the bike brake type cable and just disconnect the nipple. Put the cover back and you're done. No errors on the the ECU as it can't detect what you've done and its only there for emissions control and noise at lower revs.
I did the same to mine on the weekend. I have only been doing city riding, but the bike seems to be smoother. Hopefully will go for ride on this weekend to see how that goes. Cheers.
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Old May 27th, 2015, 11:20 PM   #24
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Quote:
Originally Posted by HyperPhil View Post
The problem is that with 2mm of freeplay in the throttle, it isn't a twitchy wrist that's going to cause a problem , it's every bump or stone in the road if the throttle is really so sensitive.

I'm a very experienced rider that's had upwards of 10 bikes over the last 20 years and i can't think of a single one that exhibited quite this behaviour. My first 5 bikes were all off roaders/dual sports where you learn good throttle control riding on wet clay, woods etc.

It is however the only bike i've had which is ride by wire. That means there is one variable i can't eliminate from the equation myself by adjusting cables and freeplay.

Anybody reading this shouldn't be put off the HS though. I've covered more miles in the last 3 weeks that i did on my previous bike in 10 months. The bike is all day comfortable for me and really is loads of fun. I tell everyone who asks that in terms of feel and riding position it feels just like a big dirt bike to me which is probably why im so happy riding it.
Yes and yes again!
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Old May 28th, 2015, 01:49 AM   #25
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Well i've just got back from 50 miles of spirited riding in Sport mode and i have to say the engine brake/surge effect is much less pronounced than in touring mode.

The engine seems freer revving not only accelerating but when rolling off the throttle , and i suspect this may well be due to the exhaust valve actuation being different in this mode. Deactivating the valve seems to be a simple process from previous posts in this thread but i dont want a loose moving cable inside the housing and the possible loss of some low end torque so i will leave it for now.

Since economy didnt seem to suffer too badly either i think i will just leave it in Sport from here in.
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Old May 28th, 2015, 07:12 AM   #26
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The extensive ducati.ms threads on the butterfly delete state the butterfly is only for noise dampening. As I've screwed up back-pressure on car exhaust mods as a kid, I was worried this would be an issue with low end response.

The anal retentive side of me also doesn't want to leave that butterfly just sitting there in the pipe. I'm torn on removing the plate as it requires grinding the rivets- can't reinstall easily. Answer is just get an exhaust but I'm just not sold on any yet...price is a factor, too.
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Old May 28th, 2015, 07:15 AM   #27
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I didn't mean to imply that there is free play in the throttle on my '13 HS anywhere other than from the zero point. With mine, I have a couple mm play from the zero point, and then no play at all after that. I get exactly the throttle I ask for, and I get it nearly instantaneously, more so than with any other street bike I have owned. The way it spools up reminds me in a way of the RM 125 two-stroke from years and years ago...
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Old May 28th, 2015, 08:38 AM   #28
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Understood Swede, thinking about it you are never going to feel free play in the throttle once its past the zero point.

Gatdammit, i'm more concerned about leaving the cable than the butterfly itself. Presumably it's still being activated by a motor/servo at the other end so with the butterfly end of the cable no longer under tension then the other end could work loose too from its mounting at the motor/servo? And eventually jam?

Last edited by HyperPhil; May 28th, 2015 at 09:07 AM.
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Old May 28th, 2015, 09:42 AM   #29
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You can disconnect the butterfly cable at the motor end too. Just be sure to remove battery first. Nice details of the procedure on another site, not sure, but may have been the Akrapovič one. You need to disconnect cable to put in a full exhaust system...

I'm with Gat about not wanting to mess with back pressure personally. My concern about changing muffler (aside of cost) is that you can never have too much low end grunt, and I'd hate to lose anything at the lowest end for a couple of HP at the top, where there's plenty already....
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Old May 31st, 2015, 02:01 PM   #30
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I also have a twitchy feeling between @3500 and 5000 revs in sport mode. When I go in a constant speed. Especially at 4000 revs it's a subtle "twitching" like of not getting enough fuel? According to my Ducati dealer there's three ways of removing the "problem". 1. Exchange front cog for one with 1 tooth less. 2. Install a power commander. 3. Install a termignoni system. What do you think?
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