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gsxr400rr Profile
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Frantic Poster
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Location: Mansfield, Notts
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GK73A - Is this sufficient spark ? (video)


Howdy guys emoticon

Right, I've spent about 700 quid on this bike and it's still not working emoticon

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 emoticon

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 :

Image

Image

Here is the VIDEO :

http://www.youtube.com/watch?v=ABCgSt5KAf4

Any ideas why its not starting before I take a hammer to it emoticon

Many thanks in advance emoticon

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9/2/2009, 11:49 Link to this post Send Email to gsxr400rr   Send PM to gsxr400rr
 
Gixergirl79 Profile
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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 emoticon

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Neeeaaaooowww!
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garynortheast Profile
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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 Link to this post Send Email to garynortheast   Send PM to garynortheast MSN
 
gsxr400rr Profile
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Frantic Poster
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Re: GK73A - Is this sufficient spark ? (video)


The added tune only took a min gixergrl emoticon thought it would be better to hear that than my engine rattling emoticon

So are my plugs shot Gary ? they were brand new cost me £30 how come there shot already ? am I gonna have to keep replacing em ?

Can you tell me if the spark is sufficient or does it look weak to you, and where should I start looking next ? signal generator ? CDI ?

Finally if you do think I need to bin these plugs, can you suggest the best ones for the GK73A.


Cheers.

Matt emoticon

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9/2/2009, 19:08 Link to this post Send Email to gsxr400rr   Send PM to gsxr400rr
 
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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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banditmax1988 Profile
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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.
10/2/2009, 1:41 Link to this post Send Email to banditmax1988   Send PM to banditmax1988
 
gsxr400rr Profile
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Frantic Poster
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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 emoticon 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 emoticon

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

 emoticon

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 emoticon emoticon

Matt.

Last edited by gsxr400rr, 10/2/2009, 9:06


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10/2/2009, 9:02 Link to this post Send Email to gsxr400rr   Send PM to gsxr400rr
 
garynortheast Profile
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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. emoticon

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10/2/2009, 9:57 Link to this post Send Email to garynortheast   Send PM to garynortheast MSN
 
gsxr400rr Profile
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Frantic Poster
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Re: GK73A - Is this sufficient spark ? (video)


Thanks for the info Gary, thats helped me a lot emoticon

I'll get lookin for best place to get those plugs then and try again emoticon

Keep ya posted.

Matt emoticon

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1965spenner Profile
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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
10/2/2009, 10:54 Link to this post Send Email to 1965spenner   Send PM to 1965spenner
 


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