gsxr400rr
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Registered: 07-2008
Location: Mansfield, Notts
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GK73A - Is this sufficient spark ? (video)
Howdy guys 
Right, I've spent about 700 quid on this bike and it's still not working 
Anything that can be replaced has been replaced, new stage 3 carb kit, new emulsion tubes, new idle jets, new plugs (3 month old) new barnett clutch, new cables, new filters, new bulbs all round... I don't know what else I can do to make this bike work, so I now ask you for your expert knowledge.
OK first problem I want to get round is it will not start off the button, when I hit the start button the engine cranks over and theres a burbling in the exhaust like it wants to start, but the bugger just wont fire
I have taken out all the plugs and took a video to show you them all sparking, plug 1 and 2 was both brown and plug 3 and 4 was both jet black.
I am not sure what this means, could it be that the only reason this is not starting is because the idle screws arn't set correctly ? also I have fiddled about with my idle and not sure if twisting it forward or backwards raises the revs, maybe its set too low for it to fire, I am not sure.
Anyway heres what the plugs looked like :
Here is the VIDEO :
http://www.youtube.com/watch?v=ABCgSt5KAf4
Any ideas why its not starting before I take a hammer to it 
Many thanks in advance 
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9/2/2009, 11:49
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Gixergirl79
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Registered: 04-2005
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Re: GK73A - Is this sufficient spark ? (video)
PMSL ... I'm not at all technically minded so I cant offer a suggestion but I watched your video and was amazed that you bothered to put a soundtrack on it. 10/10 for effort
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Neeeaaaooowww!
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9/2/2009, 13:17
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garynortheast
Registered: 06-2005
Location: Mid Wales
Posts: 1679
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Re: GK73A - Is this sufficient spark ? (video)
Whack some new plugs in there Matt, the black one looks well beyond use! And don't bother with the expensive iridiums, they do no more than resist tip erosion a little longer, they don't actually make any better a spark than the standard plugs.
Pilot jet screws screw out to weaken the mixture. Try 2.5 - 2.75 turns out from fully in as a starting point.
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Gary.
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9/2/2009, 17:00
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madmickyb
Registered: 01-2006
Location: york north yorkshire
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Re: GK73A - Is this sufficient spark ? (video)
there looks to be a fairly good spark there from what i can see ...BUT just because there sparking out of the bike dosnt mean there sparking under compression when in the cylinder .
i'd say get a new set or clean those ones up if there fairly new as you say ....i'd say looking at those plugs you got carb probs 3+4 are way too rich !!
i'l send you a pm with a link to carb tuning please dont post it on here for open viewing
laters....mick
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9/2/2009, 22:50
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banditmax1988
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Re: GK73A - Is this sufficient spark ? (video)
Thats enough spark i reckon, CDI should be fine too as you have a spark there. Pilot screws go clockwise for leaner and anti clockwise for richer. set them for what the factory pro kit recommended was to start with. Make sure your choke is opening fully too.
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10/2/2009, 1:41
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gsxr400rr
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Registered: 07-2008
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Re: GK73A - Is this sufficient spark ? (video)
Thanks for the input guys, much appreciated.
I think I am going to get some new plugs see I got the bike as a non-runner, I put some fresh fuel in it and new plugs and it started, worked and idle'd believe it or not, it was coming back from a high-speed blast from skeggy that I found it stalling at lights and not maintaining idle and it's done it ever since
Can I ask a few questions then please ..
1. Can we rule out CDI as being faulty ?
2. Can we rule out signal generator as being faulty ?
3. IF so whats left for me to replace lol
4. I feel I may have turned the main engine idle screw wrong way, how do I go about getting this right again ? maybe this is why it wont start if the main engine idle was turned down but how can I find out if I can't start the engine ?
Last Q,.... Question 5 ...
Spark plugs, I think my next plan of attack will be to remove the carbs, and set the idle screws to 2.75 turns out each, I dont like twisting them all in until they seat because I feel I will damage the idle screws, the ones I took out were a bit bent, unreal ... see when screwing them in it gets stiff like its seated, but if I put more pressure on it starts screwing in even more and I just dont know when to stop screwing it in. I will have another go in until it proper stops and 2.75 turns out, thats what me factory pro manual says too.
Oops me question on which plugs to get, man am so confused, I have just done a search online and this is what I get :
www.bitzforbikes.co.uk
Suzuki GSXR 400 (RK (GK73A) 89) - C-8HSA NGK Standard Spark Plug
www.wemoto.com
Suzuki GSXR 400 J/RR/RAK (GK73A) 88-90 - Spark Plug NGK CR9EK
www.gear4bikes.com
Suzuki GSXR400 (GK71A/GK71B/GK71F/H/GK73A) - NGK CR8HSA Spark Plug
So whos right, whos wrong, whats the CORRECT plug for a 89 400RR SP2 ?
If anyone can help me with Q 1 - 5 I would really appreciate it.
Thanks again guys, you all get a go on my bike when its fixed, I think you all earned it
Matt.
Last edited by gsxr400rr, 10/2/2009, 9:06
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10/2/2009, 9:02
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garynortheast
Registered: 06-2005
Location: Mid Wales
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Re: GK73A - Is this sufficient spark ? (video)
Matt I would say seeing as you're getting a spark your CDI unit is OK and like wise the signal generator.
Not sure which way the main idle screw on the 73 works as the carb setup is completely different to mine.
The pilot jet adjusters - are you just coming up against spring pressure when you screw them in? If you're taking the carbs off maybe it would be worth lifting all four adjusters out and then putting them back in without the springs quickly to see what they feel like. Don't graunch them into the holes though.
Plugs, according to the info I have here should be:
NGK C8HSA
or Nippondenso U24FSR-U.
HTH and keep at it. It'll be worth it in the end - they're little jewels these bikes.
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Gary.
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10/2/2009, 9:57
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1965spenner
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Registered: 09-2008
Posts: 107
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Re: GK73A - Is this sufficient spark ? (video)
Looking at the video of your plugs and with you saying the bike would stall at traffic lights and the fact you have tickover problems, this all sounds like typical carb problems mate. By cahnging the plugs you can easily eliminate them, then follow micks carb advice, fingers crossed you should be running. An old tip for free, if you have been working on your bike and trying to start the it for a while but it wont start, take your plugs out, clean them up wiht a wire brush then put them in a warm oven for a while, this helps burn off the petrol/oil residue left by the wire brush, putting them back in the bike ususlly results in it firing up if the problem was fouled plugs.
cheers spenner
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10/2/2009, 10:54
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thought it would be better to hear that than my engine rattling 
