GSXR 750 inconsistent idle

[Speed]

Hoping the BCF massive can help me shed some light on this problem. Picked up a 2000 GSXR 750 Y a couple of weeks ago and it seems to have a very inconsistent idle. One minute it’s idling at 1.5k and pulling away from a stand still is fine, no problems. Next minute it’s idling at 1k and sometimes stalls when you pull away. I’m having to over rev and slip the clutch a lot more than if it’s idling at 1.5k and makes setting off a ball ache sometimes. This all alternates between the two. Also throttle repsonsiveness is decreased somewhat when the revs are down to around 1k.

It’s got the standard downpipes (wouldn't mind changing these to some stainless steel jobbies) but has an akrapovic can fitted. I’m guessing that the previous owner has fitted the can and not had it setup properly. So I’m thinking would a dyno run and maybe even a power commander help sort this out? It's just had a service so plugs etc are all fine (well, should be )
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Current: Suzuki GSXR 750 Y
Former: Kawasaki ZX6R Ninja F3

[P.]

I didn't set mine up after the CCC can went on.

Does your FI light come on? Also have you check the air filter. Hassle to get to so likely neglected Standard service is where I'd go, plugs, oil, filters.

[Speed]

Thanks Paddy. FI light doesn't come on at all. Will have to see where the air filter is and check that out
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Current: Suzuki GSXR 750 Y
Former: Kawasaki ZX6R Ninja F3

[Speed]

Just spoke to the guy at the garage i got it from and he says that everything got changed except the plugs but was assured when he bought it from the previous owner that the plugs had been changed last year as it had a full service anyway. I trust him as he’s a really sound bloke. He said that the calipers had copper grease in them so it had been a thorough service anyway. Not too sure if to risk changing the plugs as I believe it may have been stood a couple of months until I bought it.
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Current: Suzuki GSXR 750 Y
Former: Kawasaki ZX6R Ninja F3

[Vincent]

Whats the mileage? Any valve service history?
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Space Is Deep

[Speed]

[Vincent]

Do they have wax type starter valves do you know? Could be the problem maybe?
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Space Is Deep

[Speed]

Not too sure on that Vincent. Will mention it to the guy when i see him tomorrow. All part of the lovely 'process of elimination' method
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Current: Suzuki GSXR 750 Y
Former: Kawasaki ZX6R Ninja F3

[P.]

I don't think they do. They have a fast idle lever but it's rarely used

[Speed]

Just a little update. Had the spark plugs changed, air filter changed, throttle bodies balanced, tps set up, ran injector cleaner through but still no joy. Taking it back to Suzuki tomorrow to see if they can fiddle with it some more. Proving to be a real ball ache
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Current: Suzuki GSXR 750 Y
Former: Kawasaki ZX6R Ninja F3

[andym]

Slap some super unleaded in there and take it for a bloody good thrashing down the motorway.

Again I haven't got a clue what I'm talking about here, so pay no attention to it.... but you said that:

[Pete.]

Check the vac lines for splits, a leak on the map sensor (APS) line can cause rough idle. If nothing else works check your valve clearances, tight clearances can also cause erratic idle.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[Speed]

Thanks guys, will mention the above when i drop it off with them this afternoon. It's strange how it'll idle at 1500 and then drop down and stutter at 1000 then back up to 1500. I’m thinking maybe a blocked fuel pump filter but wouldn’t that cause a constant rough idle? Plus I feel that it doesn’t have the grunt like it did before hand.
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Current: Suzuki GSXR 750 Y
Former: Kawasaki ZX6R Ninja F3

[Pete.]

Could be the pressure regulator, some Suzuki's have a filter in the regulator inlet. Might also be the return hose if it has one. If it happens more when it's hot especially.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[Speed]

Took it to Suzuki yesterday and they checked fuel pressure and fuel filters etc but both were spot on. Plugged the Yoshi box in and changed a few settings. Bikes slightly better but still occasionally drops at idle along with an occasional knocking from the tank. Will probably have to live with it or chuck it up for sale
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Current: Suzuki GSXR 750 Y
Former: Kawasaki ZX6R Ninja F3

[Speed]

Update-

Just thought I’d update this thread in case anyone else might have had these issues. After all the buggering about it turns out it was the exhaust can… The garages I took it to said that it wasn’t down to the can or a loss of back pressure. Kept mulling it over and happened to find a standard can on fleabay for £15 and thought it was worth a try. Fitted it anyway and now it runs like dream
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Current: Suzuki GSXR 750 Y
Former: Kawasaki ZX6R Ninja F3

[Vincent]

[Speed]

[Pol Anorl]

checked ecu?

injectors all clean?
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[Pete.]

[Speed]

TL:DR
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Current: Suzuki GSXR 750 Y
Former: Kawasaki ZX6R Ninja F3

[Az]

Someone on the gsxr owners page on FB had a similar problem with his akra' can. Had it setup on a dyno and its all good now.

Saying that, I have an akra on my 600 k3 & have no issues with idling at all & the bike feels and acts no different to the standard can.

[Pol Anorl]