Hard start problems - Suzuki GSX-R Motorcycle Forums Gixxer.com
 
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post #1 of 15 (permalink) Old 05-09-2018, 06:49 PM Thread Starter
Squid
 
Join Date: May 2018
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Hard start problems

HEY guys new to the forums, I have a 2007 gsxr 750. The bike runs great, it just doesn’t want to start normally. It will crank for 10 seconds then backfire and eventually start.
This is what has been done so far.

Valve adjustment, four valves were tight and they were adjusted.

The TPS was set

Fuel pressure was tested

Compression test was good

Cmp code was on, but the sensor was removed and tested ok

Repaired pin #29 on ecm

Plugs are new

The bike runs perfect and doesn’t hiccup at all. Revs fine, low speed performance is good. Will pull all the way to redline.

It has a TRE in it, but was removed and our back to stock to no avail.

I was told by this shop which is Motorsports nation in Waterford ct, which is a certified Suzuki dealership with master techs, that they have no idea what is wrong. They told me it could be a bad ecm. That is a $1300 dollar gamble.


Any good advice where I should go from here? I want them to contact Suzuki and see what they say. One of the techs went so far as saying just get out of the bike before I spend too much on it. I’m not willing to give up that easy.
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post #2 of 15 (permalink) Old 05-09-2018, 06:52 PM Thread Starter
Squid
 
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Bike has 11k miles on the odo, it’s driving me crazy. I want to find an ecm to test for before I spend the 1300. Was thinking maybe injectors, but it wouldn’t run so good if one was stuck or leaking. Idk I am stumped
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post #3 of 15 (permalink) Old 05-09-2018, 07:17 PM
Captain Obvious ... because obviously itís obvious.
 
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Re: Hard start problems

If you have a CMP code, how did they fix it?
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post #4 of 15 (permalink) Old 05-09-2018, 07:29 PM Thread Starter
Squid
 
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Good question.... I will have to ask. I know they tested the sensor and it was good. The code is no longer there
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post #5 of 15 (permalink) Old 05-09-2018, 08:22 PM Thread Starter
Squid
 
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Also replaced the clutch cover, could the CPS be out of range?
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post #6 of 15 (permalink) Old 05-09-2018, 08:39 PM
Captain Obvious ... because obviously itís obvious.
 
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Re: Hard start problems

If you didn't use an OEM gasket, the clutch basket could possibly be rubbing on the cover, but that's a stretch.
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post #7 of 15 (permalink) Old 05-10-2018, 10:00 PM Thread Starter
Squid
 
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Bump..... can anyone help me or recommend me to a shop near the easy coast who are good with Suzuki’s?? Im basically being told by the shop I have it at that they have no idea what is wrong and to get a new bike. Which is not in the cards right now. I am at my wits end with this bike
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post #8 of 15 (permalink) Old 05-10-2018, 10:02 PM Thread Starter
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East coast... preferably New England as I am located in CT
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post #9 of 15 (permalink) Old 05-11-2018, 04:04 AM
I know things... A lot of things.
 
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Re: Hard start problems

Problems with the camshaft sensor (CMP) will generally lead to starting problems. The manual clearly states that the engine will run with a CMP fault, if it develops while it's running, but it won't restart once stopped. Note that you shouldn't expect to see the code when you turn the key; it will most likely be detected when you try to start the bike since, according to the manual, the code means that:

Quote:
The signal does not reach ECM for 3 sec. or more, after receiving the starter signal.
Do you not get the code after trying to start the bike for a few seconds?
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post #10 of 15 (permalink) Old 05-11-2018, 09:52 AM Thread Starter
Squid
 
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I’m not quite sure... I know the bike will start after it’s stopped. It just takes a while, I ordered both sensors the cam position and crank position. Along with another ECM To try. At this point I’m just throwing money and parts at it.
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post #11 of 15 (permalink) Old 05-19-2018, 10:25 PM Thread Starter
Squid
 
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Problem fixed.... took the Chinese aftermarket billet clutch cover off and replaced with an OE cover and gasket. Bike starts with no issues no matter what.
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post #12 of 15 (permalink) Old 08-17-2018, 04:08 PM
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Re: Hard start problems

Quote:
Originally Posted by K7gixxer00909 View Post
Problem fixed.... took the Chinese aftermarket billet clutch cover off and replaced with an OE cover and gasket. Bike starts with no issues no matter what.
What was happening, components were rubbing with the billet cover? Some kind of misalignment?
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post #13 of 15 (permalink) Old 09-18-2018, 09:53 AM
Squid
 
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Re: Hard start problems

Am I missing something? What was rubbing to cause the starting issue??
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post #14 of 15 (permalink) Old 09-18-2018, 12:34 PM
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Re: Hard start problems

I wonder if some wires were pinched, like to the CKP sensor, and are now OK after the new cover was installed.
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post #15 of 15 (permalink) Old 12-09-2018, 08:21 PM
Squid
 
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I know this Is a old thread but i used this page alot with my bike and had all the same issues. And most of the time there's never a final answer to it. I just wanted to say I have a aftermarket Chinese clutch cover on mine and found out that the crankshaft sensor needed to be bent up about 1/16th of an inch. Seems like the aftermarket just arnt lined up right.
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