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Old 09-26-2011, 02:12 PM   #1
Relentlez
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Default bike wont start when hot unless u push started

so like the topic says my bike will start up perfectly fine when its cool but if the temp is over i say around 200 degrees it wont start up at all the only way i can start it up is if i push start it and it will start up just fine so what the hell can be the problem it cant be the battery. but maybe im wrong just help please its annoying having to push start it every time i shut it off
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Old 09-26-2011, 02:13 PM   #2
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what bike?
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Old 09-26-2011, 02:27 PM   #3
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what bike?
Moped
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Old 09-26-2011, 02:28 PM   #4
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my bad 2006 Gsxr 600
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Old 09-26-2011, 02:31 PM   #5
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does it start ok after it has completely cooled down?
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Old 09-26-2011, 02:35 PM   #6
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You need to at least do some DC volt meter tests at the battery while bike is running to rule out the charging system.

and thank christ you start whining like a little girl over my sarcasm like others here do.
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Old 09-26-2011, 02:42 PM   #7
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does it start ok after it has completely cooled down?
it starts up under 200 degrees perfectly fine it starts up in the morning just fine but i im riding n stop to pump gas or just shut it off for 3 sec and try n start her up it will not start at all unless i push start it
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Old 09-26-2011, 02:44 PM   #8
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first thing i would make sure the airtemp sensor in the air box is plugged in and has a good connection, then go from there.
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Old 09-26-2011, 02:51 PM   #9
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first thing i would make sure the airtemp sensor in the air box is plugged in and has a good connection, then go from there.
thank u ill try that tomorrow at work
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Old 09-26-2011, 03:04 PM   #10
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So, are you saying that the bike wont even turn over?
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Old 09-26-2011, 03:14 PM   #11
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So, are you saying that the bike wont even turn over?
No, he is saying you are a lard ass and need to lay off the cheese burgers old man
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Old 09-26-2011, 03:15 PM   #12
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No, he is saying you are a lard ass and need to lay off the cheese burgers old man
Phuck you.
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Old 09-26-2011, 03:17 PM   #13
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Phuck you.
got a headache, sorry punkin.
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Old 09-26-2011, 04:20 PM   #14
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got a headache, sorry punkin.
ok ok play nice. but the bike will crank but just wont start
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Old 09-26-2011, 04:29 PM   #15
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ok ok play nice. but the bike will crank but just wont start
And fuel pump is primimg?

It has to be either fuel or spark.
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Old 09-26-2011, 04:35 PM   #16
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And fuel pump is primimg?

It has to be either fuel or spark.
well i can hear the fuel pump and idk bout spark but why does it start if i push start it?
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Old 09-26-2011, 04:48 PM   #17
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Old 09-26-2011, 05:05 PM   #18
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Any chance you can swap the ECU with another known good one?
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Old 09-26-2011, 06:20 PM   #19
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How strong is the starter when hot? Does it -sound- normal when starting?
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Old 09-26-2011, 10:50 PM   #20
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Any chance you can swap the ECU with another known good one?
Well I have a friend that I might be able to swap the ecu with but Idk if he will let me. N yea the starter cranks normal its not weak so Idk but its just wierd that when I push start it starts up just fine the first time.. Agh this sucks balls thanks for helping guys hope I can get it fixed soon I'm going to put it n dealer mode tomorrow see if a code pops up I hope so that way I have a start to where to look
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Old 09-26-2011, 11:25 PM   #21
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Well I have a friend that I might be able to swap the ecu with but Idk if he will let me. N yea the starter cranks normal its not weak so Idk but its just wierd that when I push start it starts up just fine the first time.. Agh this sucks balls thanks for helping guys hope I can get it fixed soon I'm going to put it n dealer mode tomorrow see if a code pops up I hope so that way I have a start to where to look
If he doesn't then he's not a friend.

My buddy had this problem with an old '99 Kawi...every time he got gas or turned bike off, he'd have to push start it. It could be your charging system, I believe that there is a sensor of some sort that prevent the bike from starting if it is too hot. Kind of like the ones in computer if your fan fails and it starts to overheat. My point being is that this sensor may be broken, causing the ECU to think your bike is too hot due to a false positive. I know this isn't much help, but I thought I'd toss this idea into the pool.
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Old 09-26-2011, 11:38 PM   #22
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Run DC tests on the battery to rule out the charging system and do dealer mode like you mentioned earlier.
How hot does the bike get?
What mods does the bike have?
How long has it done this?
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Old 09-27-2011, 02:45 AM   #23
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Run DC tests on the battery to rule out the charging system and do dealer mode like you mentioned earlier.
How hot does the bike get?
What mods does the bike have?
How long has it done this?
Exactly what I said in post #6
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Old 09-27-2011, 10:12 AM   #24
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Run DC tests on the battery to rule out the charging system and do dealer mode like you mentioned earlier.
How hot does the bike get?
What mods does the bike have?
How long has it done this?
the bikes temperature gets max to 220% then the fans kick on but the temp doesnt get any hotter than before.
its been doing it for like 3 days now

mods i got are PCIII two bros exhaust k&N filter
T4 Turbo hayabusa engine swap bored out nothing to major haha
ok just the PCIII K&N n the two bros only the rest is not true
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Old 09-27-2011, 10:31 AM   #25
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From my automotive experience,

A bad ground or power source to and from your starter will give you problems during hot starts. It's from heat soak. If you never tampered with the wiring it's most likely your starter is going out and heat soak will cause that starting issue as well.
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Old 09-27-2011, 11:14 AM   #26
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Have the valves been adjusted recently? Sometimes they cause problems if they are to close when hot.
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Old 09-27-2011, 02:07 PM   #27
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Have the valves been adjusted recently? Sometimes they cause problems if they are to close when hot.
no i havent done any valve job.
n as far as the starter goes it cranks strong but just doesnt start up so that seems to be in good condition but i might be wrong. my boss has been here at work so i gotta wait till he leaves so i can check it out
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Old 08-13-2012, 05:44 PM   #28
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okay this thread just kinda died but i am having this same exact problem and im also looking for some help. i have a 06 750 with two bros, bazzaz fi, and a k&n and the charging system is fine i ran all the test and the battery is only a year old. just replaced the starter today didnt help. also there are no codes, reading through here i like the idea of a sensor sending a bad code making the bike think its to hot but if the temp is only reading around 200 then what sensor could it be? any help would be greatly appreciated its pretty embarassing having to push start at gas stations.
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Old 08-13-2012, 07:50 PM   #29
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yeah...i've got a buddy with an 03 busa with ~85xxx miles on it that started to do this over the last 6-8 months. i don't think its had the valves checked either. starts up fine when pushed started. he has all new charging system,new starter and battery. i told him it might be valves but what do i know.
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Old 08-13-2012, 11:27 PM   #30
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Ever since i moved to Phoenix I have the same issue in the summer. When my bike gets hot(above 220) if i am in traffic, or a big accident, my bike wont start up unless it cools down. I wired my fan to a manual switch so i can turn the fan on lower than 220. I havent had an issue. It will only do that if it gets above 220, and luckily that has only happened to me twice.
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Old 08-14-2012, 05:22 AM   #31
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Well my bike does it from like 190 and up which is any normal temp after riding =[. I checked the valves a couple months ago and everything was just fine. This is real frustrating
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Old 08-14-2012, 05:31 AM   #32
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also i have a fan switch wired in as well but its not enough to let it start. there is an electrical problem somewhere that im not finding and i just need a direction to head cuz i have done everything i know to do
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Old 08-14-2012, 08:55 AM   #33
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Also keep in mind gsxr's CAN be hard to start when hot. Mine won't start shortly after shutoff unless I give it partial throttle.
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Old 08-14-2012, 09:50 AM   #34
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OK well i haven't been on this forum in forever but either way i still have the same problem i did end up replacing my stator rectifier and battery like 5 months ago but that did not fix this problem still have the same problem and the new thing i found out is if i turn the bike on and just let it idle until it gets over 200 degrees even at 225 degrees the bike will start up just fine it only has the problem when i actually ride it and most of the time next to a girl or something like that so its F*ckin embarrassing and annoying. im guessing it might be like the air temp sensor or somthing since there is no air affecting it when its just idling or i might be wrong im guessing i am wrong
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Old 08-14-2012, 12:05 PM   #35
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OK well i haven't been on this forum in forever but either way i still have the same problem i did end up replacing my stator rectifier and battery like 5 months ago but that did not fix this problem still have the same problem and the new thing i found out is if i turn the bike on and just let it idle until it gets over 200 degrees even at 225 degrees the bike will start up just fine it only has the problem when i actually ride it and most of the time next to a girl or something like that so its F*ckin embarrassing and annoying. im guessing it might be like the air temp sensor or somthing since there is no air affecting it when its just idling or i might be wrong im guessing i am wrong
makes sense, i have never just let mine sit and idol up to that temp. but i know if i just shut it off it will fire right back up but if it sits for a couple mins it wont start. everybody saying the just to open the throttle a lil bit i will have to mess with a little more. i have tried a couple times and it didnt work but i cant actually rule that out just yet. is there any way the starter clutch could have drag when hot?
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Old 08-14-2012, 05:25 PM   #36
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Had the same problem on my 02 600. Changed the coolant sensor in the radiator and the cylinder head temp sensor and it fixed my problem.
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Old 08-15-2012, 06:31 AM   #37
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Had the same problem on my 02 600. Changed the coolant sensor in the radiator and the cylinder head temp sensor and it fixed my problem.
did your temp read normal like the sensor was good? i guess im just asking what made you change them cuz my temp seems to read just fine.
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Old 08-15-2012, 05:58 PM   #38
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temp read normal but figured it wouldn't hurt to change two of the least expensive parts first to see if it fixed the problem. luckily it did.
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Old 08-15-2012, 06:43 PM   #39
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you're losing compression when its hot. its starting with a push start because the motor is spinning much faster than with the starter and the extra rpms are needed when you have low compression. you can be losing compression from either bad piston/ piston rings or more likely from valves that are out of adjustment. when the motor is cold your valves are in spec enough to start, but once hot they become too far out of spec. the reason i say more likely than pistons or rings is because these motors can last a really long time on one top end. valves need to be adjusted yearly. do a compression test hot and cold
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Old 08-16-2012, 06:37 AM   #40
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you're losing compression when its hot. its starting with a push start because the motor is spinning much faster than with the starter and the extra rpms are needed when you have low compression. you can be losing compression from either bad piston/ piston rings or more likely from valves that are out of adjustment. when the motor is cold your valves are in spec enough to start, but once hot they become too far out of spec. the reason i say more likely than pistons or rings is because these motors can last a really long time on one top end. valves need to be adjusted yearly. do a compression test hot and cold
i went through and checked the valves just a couple months ago and everything was in spec. i will deff do a compression check tho. my bike has 22,xxx miles so its not extremly high but it does have some miles.
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