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I have a 2003 600rr with 15k miles history unknown other than was non running when I purchased.
The problem I am having is that the bike has a very hard time starting after driving say 40 miles, during the first 40 miles there is a slight hesitation when under hard acceleration and after around 60 miles the bike will continue to run ok but once shut off will either take 10-15 seconds of cranking to start or will not start unless throttle is held wide open. After holding throttle wide open I get FI light on my dash and bike smells extremely rich. I have the service manual but when I tried to pull codes I came up with nothing. I am thinking it is a spark plug issue but I would like to hear your input on the issue. Also the bike is running between 190-220 in town around 180 on the highway which I think is acceptable. I will be bringing the bike into the shop Thursday if I am unable to figure out the problem.
What I have done so far is add slip on, bypass BAS and replace the ignition.
 

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Nike Will only start when throttle is held wide open
 

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I had the bike at a shop but they were unable to determine the problem. The weather here is now much cooler now bike is starting fine but running extremely rich and upon down shifting will sometimes shoot flame out exhaust which tells me running very rich. I added a aftermarket slipon and for some reason the bike has 05/06 headers on it do you think the different headers is causing the problems?
 

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Clean the fuel system. If its as hard to start as you claim and is sluggish that points a fuel problem.

Being a 03... It may need its values checked and tuned. Anyhow I suggest that you grab a manual... Drain the fuel, clean the lines and inspect the injectors. Also check to make sure that the fuel tank has the correct pressure and stable .

While you are in there inspect the spark plugs. They are super easy to inspect/change out. If you have to oem tool kit it should take you less than 30mins. That includes undressing the bike, taking the bolts out the radiator and changing the plugs. Inspect and Change the. If needed, even check for spark.


Those are good starting points! When is the last time you have run a good clean tank of fuel through the bike?
 

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The fact that it takes the WOT method to crank is a give away fuel problem. Follow my suggestions and pm with your findings etc. I most likely wont check this thread often.

I will be more than happy to assist you through this. I dealt with similar issues during my build.

Best of luck!
 
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