There's only one post on this subject within the forum that I can find..apologies if other posts exsist.

I've only put 50 miles on my 09' S.W (it had 471 on it when i bought it from Honda last week) and already I've found something that most people are putting down to either: The grip, or how you hold the throttle.

At slow speeds, E.G moving along behind slow traffic, you can feel the bike ever so slightly surging forward, like it can't settle and its wants to move up a gear. The surging seems to start over 10 mph and is prevalent throughout upto about 30/35 mph..Somebody also mentioned the fuel injection system but I'm no real mechanic so maybe someone can comment on that. My backside literally jiggles back and forward if I try and hold say 25 mph for any period of time. Now I also have a restrictor kit on this bike which was fitted by my Honda dealer, as I'm restricted to 33bhp for two years as I did my test on my previous bike (Honda s wing 125cc...which held slow speeds behind traffic perfectly), but I don't know if that has much to do with it or not?? My throttle seems fine and theres no play or slackness in it.

I love this bike, but living and driving in Edinburgh, (Scotland) I have to contend with alot of slow moving traffic at busy times and this surging thing is going to bug me off this bike and onto another and I don't want that...please help

Hi ozbar,

I have never heard of this happening before. I wonder if it's that device the dealer installed. Do you get out on the highways much?

I did the first day i got it but i was so excited to get my new bike, that it wasn't something I was looking for...what do you suggest?

Put the Silverwing on the center stand, while standing lightly apply the throttle. Check if problem still occurs. Check if hand position or angle changes behavior.

Ask the dealer to re-inspect the installation ... and get some details about the device where it plugs in and how it controls the HP.

I've never encountered that feeling on my '04 Wing. I'm not sure how that restricter kit works, but that could have something to do with it. You have to ride a crippled bike for 2 years? Sheesh, they've got some funky rules over there...

So i tryed sticking it on its centre stand and revved it up to about 15/20mph. What i did notice is that as the back wheel was spinning, i was getting a sudden vibration every so often...it might be some centifugal force to do with a spinning wheel or something i don't know, but i took it out for a ride and it felt ok. I tryed holding the throttle right at the end with my hand mostly on the bar end and i could still feel ever so slightly this rocking motion of the engine not wanting to settle into a gear ( I was riding the bike during this point). Do you think the restriction kit might have something to do with this?

Sweendog i hear you. I think the problem was that too many people were passing their test on little 125cc twist and go's, and then buying some monster 1200cc and killing themselves because they wern't used to the extra power..so they desided to go down this route. If i had passed on a 500cc geared bike i could have bought anything my heart desired. But because i passed using my 125cc i have to be restricted.

ozbar, If you ever find or locate this device on your scooter, besure to take some pictures and post them.... let us know how it's hooked up.

This is general fitting instructions for the restrictor..i have the throttle restriction (Kit F)... what do you think??

www.fiinternational.com/fitting-and-care.asp

then download the pdf (this is what it says about my kind of restrictor)

"The basics of the kit is that a device is attached to the side of the injection bodies, which stops the throttle cam from opening fully. This is normally combined with restriction blades that go into the airbox or sometimes the inlet manifolds"

I think it SUCKS!!!!!!

Cripple the ride, AND pay through the schnozzle for it.

By looking at the instructions, these restrictors go on both throttle body controls. If they are not machined identically or installed exactly, both throttle bodies will not be perfectly synched. That WILL cause surging. My advice: get them both removed ASAP.

Just a thought Ozbar, but, I have only been riding a scooter for a few
months. I have been riding bikes over 50yrs.
The thing i found puzzling was, at 15mls or less the drive is taken away
and it seems you are in neutral. Is this what you mean?

Suggestions????

The bike is still in gear, as the revs are at about 2500rpm

I suppose you'd get in big trouble if it just happened to "fall off" or otherwise disappear...?

I can't Bigbird...well not legally anyhoo. If i have a crash and the insurance company checks to see that a restrictor kit is fitted, and its not there then I'm in deep doodoo. It would be interesting to see how it rides without it and if the kit is my prob??

My honda shop could probably do the third option...what would that do??

I would imagine the first thing i should do is call them and ask if that is something that they would have done, once the restrictor was fitted. If it hasn't been done i should insist it is done and take the bike down. If it has been done, I'm still going to take it in, and get them to re-look at the install.

Anything else..??

The throttle restrictor doesnt restrict my performance really. I was driving yesterday at 87mph. The Lower and mid performance arn't affected i don't think. As far as i'm aware the restictor kit just doesn't allow me to go flat out. I road a 125cc s wing before this...believe me theres no comparison..

which is making me think maybe the restrictor is something that just stops me using all of the throttle cable...instead of conected to the engine in some way, like edbancro mentioned...

Mmm
When i thought that some sort of maintenance hadn't been done related to the restrictor kit...i was sort of please as i knew it was just a case of rectifying it. Now it could turn out that its simply a screw stoping my throttle cable extending all the way. (An expensive screw at £170) in which case its something else causing this surging....

thanks to everybody for their help and advice. Once i find out what the problem is i'll post it here just in case it happens again..ride safe

So the bike went into Honda today, and after two techs took her out for a ride they both reckon that theres nothing wrong with her (read: Its all in my head ) The salesman who sold her to me is going to give me a third opinion when he takes it out for a spin tomorrow, before i pick it up in the morning. So what do I do?? Do i conceed that the bike has a few niggles and just get on with it or do I sell her, (probably losing £500-£1000 even though i've not done 100 miles on her yet)....

I quoted the general instructions from the website you linked to:

"With more and more bikes being produced with fuel injection systems this type of restriction is becoming more popular. The basics of the kit are that a device is attached to the side of the injection bodies which stops the throttle cam from opening fully. This is normally combined with restriction blades that go into the air box or sometimes the inlet manifolds. Generally each of these kits has specific fitting instructions that are delivered with the kit."

The part that bothers me is that they normally combine a restriction blade in the airbox or intake manifold along with the throttle cam stop.

Restricting airflow during normal throttle operation will have an adverse effect on the fuel injection. Less air means less fuel will be delivered. This could send the FI into a lean mode causing surging. I'm no engineer, but it seems that if you want to limit HP, you simply limit throttle travel with the cam stops. I don't know why they would tinker with airflow. Airflow is dependent on throttle opening. If you limit the throttle opening, you're already limiting airflow. Why not try removing the blades in the airbox or intake manifold, while leaving the throttle limiter in place? Maybe discuss this with your tech?