Chalkwizard
stranger
Reged: 01/06/2009
Posts: 2
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I have a GSXR 600 (1997) with a bizarre problem. First 5 minutes of every journey the bike runs fine however soon after it starts acting up. When pulling away from stationary, holding the throttle steady and releasing the clutch the engine almost dies then very slowly picks up whilst pulling away (very unsteadily) before suddenly increasing in revs and the bike launches away after aprox 5 seconds. Then when travelling the bike lurches forward with a regular rhythm feeling like im sitting on a rocking horse. This gets progresively worse over a period of days yet when left for a few days returns to the start of the cycle. My local repair centre has had the bike for 6 weeks and come up with nothing after stripping the engine, the best advice they could give was to keep the tank filled. Whats wrong with my bike??????
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chappers
Carpal \'Tunnel
Reged: 31/12/2006
Posts: 6701
Loc: Mind your own business
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Check the fuel tank breather for one, then the fuel tap diaphragm, Carb balance.
It may well be worth stripping the carbs checking all the settings, IE float height and condition of needles wear blocked jets. Another thing to check is the rubber diaphragms on the throttle slides CV carbs rely on a vacuum caused by the throttle butterflies opening to regulate how much to lift the slides so if the diaphragm is split it isn't going to work.
Further checks would be all vacuum pipes for perishing and leaks.
It might also help to check for water in the fuel which might account for the kangarooing.
I'm guessing the bike has been laid up over winter did it have a full tank of fuel is the inside of the tank corroded and blocking filters?
If you local repair center stripped the engine to try to diagnose the fault take it elsewhere they are fucking idiots your problem IMO is either if the fuel delivery system or otherwise it may be ignition/electrical although I think it's unlikely to be the latter sure as hell not mechanical.
Without seeing the bike personally and witnessing the fault it's the best I can offer.
Best bet, start simple things and work up.
IE if your bike don't start look in the fuel tank before you start looking for holes in the cases.
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Say what you think and think what you say.
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Chalkwizard
stranger
Reged: 01/06/2009
Posts: 2
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thanks for the info, yeah it was laid up over winter but fuel has been drained and replaced, the garage say theyve checked the carbs and reckon that its breathin ok but i agree with your comments re them being clueless. I am a total incompetent when it comes to mechanical issues but i was dubious about their level of competence. Ill try whats been suggested (to the best of my limited abilties) and if that else fails find a better repair centre.
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chappers
Carpal \'Tunnel
Reged: 31/12/2006
Posts: 6701
Loc: Mind your own business
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Get a manual and some help from someone with some experience.
Sorting a problem is only a matter of folowing a logical progesssion, many manuals have a trouble shooting section.
I can't help feeling that your troubles stem from the bike lying idle.
things like sediment, moisture, corrosion and deterioration seem to be magnified with inactivity.
I wish I could do more to help good luck and keep us posted.
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Say what you think and think what you say.
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Tapoutduke
member
Reged: 14/11/2006
Posts: 197
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I would check all that Chappers has said, but in addition check the spark plugs. If the carb balance was wrong, i.e. clogged up, then these may need replacing. The carb balance is a good start, and am surprised that the garage you took it to did not look at these suggestion before stripping the engine - if they indeed did. One thing to try, to clean the fuel system is a small amount of fuel injection cleaner. Yes, I know you have carbs but it will still clean the pipes and fire out any crap that may be in the system. A few drops should do.
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cbreddie
newbie
Reged: 21/05/2009
Posts: 47
Loc: Rochdale, Lancashire
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I had a similar problem with a Kawasaki many years ago.
it ran ok for a while then cut out and was a pain to start, it turned out that I had sprayed laquer over the fuel cap breather.
If you run the bike until it cuts out, remove the fuel cap, if it hisses then your breather is blocked, the bike should start pretty soon afterwards (once the fuel has got back into the carbs)
I dont paint my bikes anymore 
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Only worry about the things you can change, never worry about the things you cant!!
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chappers
Carpal \'Tunnel
Reged: 31/12/2006
Posts: 6701
Loc: Mind your own business
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What cbreddie has just written has reminded me of something.
I don't think on that year of GSXR the tank breathes directly out of the cap but indirectly via a hole around the filler neck next to the overflow pipe via another pipe that exits under the bike if it's kinked it won't vent properly.
I could be wrong though as it's been 10 years since I had that model of GSXR.
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Say what you think and think what you say.
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cbreddie
newbie
Reged: 21/05/2009
Posts: 47
Loc: Rochdale, Lancashire
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Thats entirely possible if the fuel system has been cleaned out, cos the tank must have been removed to get to the carbs.
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Only worry about the things you can change, never worry about the things you cant!!
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