K8/K9/L0 GSXR Startup Issue

viper84737

viper84737

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Since I couldn't find this thread elsewhere on this forum, I'd like to bring it to people's attention here for feedback etc.

http://www.gixxer.com/forums/showthread.php?t=301833

[video=youtube;XzfWHUNSQi4]http://www.youtube.com/watch?v=XzfWHUNSQi4&feature=player_embedded[/video]

I'm viper84737 on that forum, too, so you can read my posts there and I won't have to repeat myself (too many times, I surmise).

If anyone's still having this problem, let's get organized.
 
i had an 08 750 but no issue like that....it seems that your bike is not going into cold-start mode....is it stock? any mods done by you or previous owner if not bought new by you?
 
Mine is functionally stock, only miscellaneous, irrelevant parts have been altered, like the addition of frame sliders, bar end sliders, and a brake lever. Just the brake lever, not clutch. The bike has had a fenderectomy as well. I am the original owner and sole operator so I know its history inside and out.
 
so for all intents and purposes, its stock. interesting...any helpful hints on the other forum?

viper84737 said:
Mine is functionally stock, only miscellaneous, irrelevant parts have been altered, like the addition of frame sliders, bar end sliders, and a brake lever. Just the brake lever, not clutch. The bike has had a fenderectomy as well. I am the original owner and sole operator so I know its history inside and out.
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Check your Spark plug boot connecters/leads. Make sure they are securely bolted down on the plugs. Battery connections tightened down?

Edit:

My Manual, (GSX-R750), says when cold engine is hard to start, Open Throttle 1/8 of a turn, hit starter and let engine run normally.

Hope this helps.
 
Last edited:
apextech said:
Check your Spark plug boot connecters/leads. Make sure they are securely bolted down on the plugs. Battery connections tightened down?

Edit:

My Manual, (GSX-R750), says when cold engine is hard to start, Open Throttle 1/8 of a turn, hit starter and let engine run normally.

Hope this helps.
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This could help, also I'm not sure if its on this bike but when it's cold, my bike has idle adjustment (05 zx6r 636). in the winter i'll turn it a little to make it idle at higher rpm.

also when it shuts off, turn it off completely and let it prime once or twice, this usually helps.
 
Just to be clear, people have been experiencing this in 25C+ weather in California, so I'm fairly sure it's not necessarily attributable to weather alone, but thank you for the feedback anyway. Also, even when the bike idles at 4000 RPM by my hand on the throttle, it certainly sounds like one of the cyls is not firing each revolution.
 
I have a K10 750. I have not had this issue yet but only have 10,000 on the bike. Let me know if you find the problem as it may be very useful to me in the future. I plan on keeping my bike for at least another year before getting a liter + bike.
 
i have the exact same problem. sometimes ( very rarely will it start without any problems. usaly i just hold the throttle at idel speed until it reaches about 50°c then it idels fine and runs beautiful. i have added a servo buddy and changed the plugs but this happend before i did any of that. im hoping with a PCV it will solve this issue by adding a bit of extra fuel at the start up period.
 
That's not normal.
I suggest you look into the following:
1. air filter and ram air ducts, make sure everything is clean and clear
2. spark plugs - how old are plugs, doesn't hurt to change them, post pics of them when you remove them.
3. coil packs - you might have a bad one, also remove them clean out with wd40/brake cleaner and a tiny screw driver, something to gently clean the surface inside of them to remove top layer of corrosion
4. run some engine cleaner - try the gumout engine cleaner , dump half a bottle to a full tank of clean gas
5. possible water in your tank???
6. fuel injectors a bit clogged - item 4 should help that
7. also clean off your battery terminals and reconnect it
8. while you have the tank up, check all the vent and drain hoses too, get a can of air or use a compressor to blow through them, put a glass of water below to see if water moves or have someone see if air is coming out while you blow air through the lines...likely not related but doesn't hurt to ensure things are in proper order

So you do NOT have a power commander or other device like that. If you do, remove it for now.

It would seem that it could also be something that expands once heated up and makes a better connection but when it's cold retracts and creates a gap.

If you have done all of this and still the same problem then just for the hell of it, swap computers with someone and see if they have your problem and your bike works properly.
 
Stop, just stop. I had this problem 4 years ago and I solved it very easily, and it had never even once returned since.

Take off your air box. Open your air box. Look for an oily residue on the inside of it. If it's there disconnect ALL your vacuum lines one by one, clean them out with a pipe cleaner or even a stick. Problem solved. It's probably the K&N oil in your filter gunking up the vacuum lines tubes as it was the case for me. Also check and clean out the plastic T-junctions that connect the hoses.

I'm not speculating here, I actually have experience solving this exact issue.
 
viper84737 said:
Stop, just stop. I had this problem 4 years ago and I solved it very easily, and it had never even once returned since.

Take off your air box. Open your air box. Look for an oily residue on the inside of it. If it's there disconnect ALL your vacuum lines one by one, clean them out with a pipe cleaner or even a stick. Problem solved. It's probably the K&N oil in your filter gunking up the vacuum lines tubes as it was the case for me. Also check and clean out the plastic T-junctions that connect the hoses.

I'm not speculating here, I actually have experience solving this exact issue.
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Easy there, I forgot to look at the date on your original post. Next time edit your post and put your fix so others could try it.
 
Great to know - I had a 2010 750 and had that issue for a long time and then just went away. I never knew what it was.

viper84737 said:
Stop, just stop. I had this problem 4 years ago and I solved it very easily, and it had never even once returned since.

Take off your air box. Open your air box. Look for an oily residue on the inside of it. If it's there disconnect ALL your vacuum lines one by one, clean them out with a pipe cleaner or even a stick. Problem solved. It's probably the K&N oil in your filter gunking up the vacuum lines tubes as it was the case for me. Also check and clean out the plastic T-junctions that connect the hoses.

I'm not speculating here, I actually have experience solving this exact issue.
Click to expand...
 
I wonder why this only affects the newer gixxers?
 
RockerGuy said:
I wonder why this only affects the newer gixxers?
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He said he had a K&N filter which they put oil on that filter so easy to put too much oil and or clog the system over time.
Maybe stock bike could have had too much oil that kicked back into the airbox plus new bikes vent into the airbox, over time builds up residue.
Notice the problem goes away after bikes heats up...the oil 'melts'.
 
I honestly think is something the Jap engineers did to **** with us
 
I've only used the stock airbox so I guess that's why I never had this problem. I'm close to 55k km
 
-D- said:
He said he had a K&N filter which they put oil on that filter so easy to put too much oil and or clog the system over time.
Maybe stock bike could have had too much oil that kicked back into the airbox plus new bikes vent into the airbox, over time builds up residue.
Notice the problem goes away after bikes heats up...the oil 'melts'.
Click to expand...
That doesn't explain why the old gixxers never had this problem
 
Seems like besides Venoms answer, the only plausible cause is what haunts all bikes, especially Ducati... moisture. Take the seat and seat cowl off and look at the connections into the ECU for blue fuzz... even go so far as to spray them with water while running the bike and listen to idle for drop. The other is seized Idle Speed Control (ISC) valve. Very common problem.
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