Fueling problems post-derestriction
 

I had my 01 SVS derestricted today because my two years are finally up and now it's running like an utter dog.

The Suzuki restriction kit was simply swapped out for the original parts and now it won't idle properly: the idle speed keeps bouncing between 1K and 2K like the engine's about to stall and it doesn't improve as the engine warms up. When riding in a straight line on a constant throttle, the bike keeps lurching as the rear tyre suddenly digs in like the power's been cut for a fraction of a second before releasing and shooting forward. The lurching's really bad when closing the throttle to engine brake and it's also really bad at low speeds and nearly had me off in a car park. The acceleration's also completely **** compared the way it was before.

I've left the bike with the workshop to get them to look at it but I get the feeling he doesn't give a **** and is trying to blame the parts as being dodgy. He says all he did was lift the tank and airbox, swap the parts and put everything back in but I don't think he even bothered to turn the engine on to make sure everything worked; the idle speed weirdness is noticeable just by watching the rev counter.

Anyone got any ideas what could have happened?

Re: Fueling problems post-derestriction
 

Its a curvy so carb'ed.

I dont think you can just remove the washers and expect it to run fine, dont you need to sort the fueling etc?

Re: Fueling problems post-derestriction
 

I had the problem after putting them in that fueling was really carp and would die on me at certain points, then when I took them out, she ran a little better. Maybe the carbs were set up to run nicely with washers in but now the flow has been increased, it's not set up that way specifically.

Wait for someone more techie to come along.

Re: Fueling problems post-derestriction
 

Note the OP has Suzuki modified carb sliders, not FI international washers.

Silly question but has he replaced the sliders in both carbs?

May also be a cracked / disconnected vacuum hose.

Or possibly a leaking diaphragm on one of the sliders if it was not inserted correctly.

If the bike was running fine during the restriction and the full power parts are in good condition and fitted correctly you shouldn't have to adjust anything especially at idle.

Remember the restriction sliders only come into play when the throttle is opened.

Re: Fueling problems post-derestriction
 

Very good point, my post is useless, as am I :D

Shoudla picked up when you said original parts have been replaced.

Re: Fueling problems post-derestriction
 

He's replaced the sliders in both carbs so that's not the problem. I was thinking that the fueling might have been adjusted by the Suzuki dealer who put the restricted sliders in and now the full power ones are in, it's running much richer than it was set up for. If RachetJob's right (and I imagine he is) then the guy probably just botched the job.

I'm going to phone tomorrow morning and see what's happened. If it's still not fixed, I'll dispute the charges with my credit card company and just take the bike to the dealer who originally restricted it.

Re: Fueling problems post-derestriction
 

choke cable on the carb been attached correctly? I've been told that a sticking choke cable can cause grief. I've got a carb'd model too and to take the carb sliders out i've been told is a pain.

Best thing to do is take it back and get them to dyno the bike. had mine done at christmas for the same faults as you. a hole was found in the pipe that supplies the scotoiler. bike now runs fine

Re: Fueling problems post-derestriction
 

Yon f*cktard in garage has not seated airbox correctly or not tightened carb clamp up.

Don't go dynoing it unless you haven't already set a load of money on fire already today, engine is lean on bottom somewhere from airleak or (unlikely) clogged pilot circuit.

Re: Fueling problems post-derestriction
 

Re: Fueling problems post-derestriction
 

It's all fixed now so I'm guessing he checked everything and found something wasn't connected properly. I am impressed that he stayed on past closing to make sure it was done in time for me to use it to get to London today.

I was expecting it to be a completely different bike based on what people here have said but it feels pretty much the same. It's only after I get past 80mph that it feels different, mainly because it's not gasping like an asthmatic any more.

Re: Fueling problems post-derestriction
 

i think he should be prime minister

Re: Fueling problems post-derestriction
 

So it's different then aint it :P

Re: Fueling problems post-derestriction
 

****, the problem's still not fixed.

The idle speed isn't steady even when the bike's completely warmed up and just bounces up and down over a range of a few hundred revs. All the connectors are in place as best as I can tell so the carbs probably need to be balanced/sync'd, which is beyond me.

Booked it into Essential Rubber to get it done because I've heard good things about them.

Re: Fueling problems post-derestriction
 

essential rubber are very good, i feel comfortable taking my bike to them. I can only think its some kind of air-leak, or perhaps the sliders in the carbs are sticking?

I had the good ol' rip-off washers (£240 for parts and labour!!!!) and suffered no problems when they came out..

Re: Fueling problems post-derestriction
 

The bike's absolutely fine over 80mph so I'm going to time my journey to London today to coincide with the lowest amount of traffic. Finally, a semi-reasonable excuse to speed like a little ****.

Re: Fueling problems post-derestriction
 

And now you're off the 33bhp you can get your full quota of points too :-P

What happens when you blip the throttle at standstill? Does the speed stick a little high, then drop down again?

Re: Fueling problems post-derestriction
 

Sticky sliders would not cause this problem. Broken diaphragm would not cause this either I don't think.

Re: Fueling problems post-derestriction
 

**** me, this thing accelerates like **** off a fan when you roll on the throttle at 90mph.

Blipping the throttle at a standstill causes the revs to increase smoothly and then drop immediately and go back to bouncing around the idle speed. I lifted the tank up and took the airbox out to check connections and they were all fine, so I suspect the carbs aren't balanced, which is the only thing the manual suggests for a jerky idle speed provided there's no air leak.

Re: Fueling problems post-derestriction
 

Bring it to Soho tomorrow night and get the opinon of someone who can actually see/hear the problem?

Thats if Essential havent fixed it by then

Re: Fueling problems post-derestriction
 

All fixed! Essential Rubber balanced the carbs and said the choke hadn't been reconnected properly, which they fixed. It's running perfectly now.

Thanks for all the suggestions and help.

I would have done that but the girlfriend's being demanding, pointing out that her exams are about to start while mine have finished and therefore I should be doing her shopping and cooking for her.