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Old 08-10-2014, 05:34 PM   #1
j0nathan
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K4 gsxr 750 won't start

Appears it's not getting gas but don't know why fuel pump primes and have let it run and seen plenty of fuel come out but it's seems they being injected the rest of the way don't know much about mechanics just trying to figure it out, I've already replaced my spark plugs, idk what exactly to do was, gonna try n clean injectors through the butterflies with carburetor cleaner and see if that helps but don't know what else to try i thought it was the gas at first but only had a little in it and filled rest up with fresh gas, saw that the wires leading from this green plug go to nothing but each other and have tape on em but seems it's been that way for a while. Idk open to any suggestions, I move to SA Saturday and it's my main mode of transportation and don't have money to take to a mechanic right now. ubaqybem
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Old 08-10-2014, 05:41 PM   #2
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Is it getting spark?
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Old 08-10-2014, 08:32 PM   #3
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You'll have to let someone troubleshoot it in person since you can't possibly describe the sitiuation and understand the mechanics of it all. Fuses, battery connections, and kickstand switch are all things to check as a first glance.
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Old 08-10-2014, 10:00 PM   #4
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Battery is fully charged, fuses are all good, and kickstand switch has been disabled since I had the bike. The spark plugs were jus replaced when it started acting up is there a way to check to make sure I'm getting spark? Also I read somewhere about if it's slightly flooded taking out the spark plugs and cranking it, how exactly does this work?
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Old 08-10-2014, 10:02 PM   #5
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The spark plugs I took out were very worn though...definitely needed new ones
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Old 08-10-2014, 10:06 PM   #6
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does it crank? any cel?

green plug wires that go together might be the kickstand bypass.
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Old 08-10-2014, 10:07 PM   #7
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Yeah it cranks and turns but won't catch and start occasionally it'll try and sputter a little but for most part it's just the starter cranking
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Old 08-11-2014, 09:57 AM   #8
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Could be the run switch....try cycling it a few times on and off.
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Old 08-11-2014, 05:21 PM   #9
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Quote:
Originally Posted by bdmpastx View Post
Could be the run switch....try cycling it a few times on and off.

Are you talking bout the kill switch? If so I've tried it and it jus primes and then when I hit start it tries to start jus doesn't
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Old 08-11-2014, 08:57 PM   #10
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and the other questions was.......are there any cels?
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Old 08-11-2014, 10:43 PM   #11
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and the other questions was.......are there any cels?

Sorry didn't see that one, how exactly do I check that? would that be something could just start happening after one day? Also would it allow the bike to try to start (turnover) but keep it from actually completing?
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Old 08-12-2014, 06:30 PM   #12
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Well I'm going to take off the fuel pump tomorrow I think any suggestions or advice? Also what is the best way to drain my tank? It's completely full
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Old 08-12-2014, 06:49 PM   #13
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You said the fuel pump works, right?
Just use it to pump the fuel out of the tank.
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Old 08-12-2014, 06:58 PM   #14
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It appears as though it does and it seems to be flowing strong but I'm going to check the filter anyway because I read a thread where I guy seemed to be having the same problem and fuel was flowing but it wouldn't shoot out of his injectors so he took off the fuel pump and the filter was dirty after cleaning it worked, hoping this is the same problem with mine.
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Old 08-12-2014, 06:59 PM   #15
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Quote:
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You said the fuel pump works, right?
Just use it to pump the fuel out of the tank.

Would I jus run wires to possitive and negative battery and it will activate and drain or what?
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Old 08-12-2014, 07:37 PM   #16
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ghetto way to drain gas: get a tube and suck, suck, suck.

i wouldn't advise you to do the battery method unless you know what you're doing. fuse the +12v wire or get a power probe to do it. as far as the cel, do you get a check engine light on when you turn the key? i don't remember how to pull codes on that particular year. you should find a service manual.
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Old 08-12-2014, 07:48 PM   #17
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I've pulled the codes and it's just my stva like before
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Old 08-12-2014, 07:49 PM   #18
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ghetto way to drain gas: get a tube and suck, suck, suck.

And that was my plan
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Old 08-13-2014, 07:01 PM   #19
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K4 gsxr 750 won't start

Dam bolts are ridiculously hard with loctite
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Old 08-13-2014, 07:33 PM   #20
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a8y6abap well no wonder my jets weren't shooting
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