Question about Suzuki GSX 600 F (Katana Motorcycles

2 Answers

I have a 2006 GSX600F Katana with 500 miles on it from new and am looking for assistance to fix the problems of idle speed increasing when the bike gets warm, flat throttle response at low revs and RPM's hanging when the throttle is released. Here are the symptoms / conditions: From a cold start: The bike starts easily but always requires the choke full on. The bike initally idles evenly at around 1200 RPM but as the bike warms up for a few minutes (choke still on) the revs shoot up to 3, 4 and eventually 5,000 RPM until the choke is released. When the choke is removed the bike settles down to an even idle again and will generally remain there without stalling providing you don't touch anything. If during this warm up period you attempt to open the throttle, even the smallest amount, the bike immediately dies. It starts up again straight away and idles smoothly until you touch the throttle at which time it dies again. This pattern goes on for at least ten minutes before the bike is in any way ridable. As the bike really warms up in road use two things occur: 1. The idle speed increases up to about 2,500 RPM and sometimes higher, and you need to adjust the idle knob to get it down again. (Of course when the bike is cold the idle screw needs to be adjusted back up otherwise the idle is too low.). 2. When the throttle is released the revs will generally hang for several seconds before slowly settling back down to idle. In general, the performance of the bike seems about right in the middle to high rev band (other than the hanging RPM). The throttle is responsive and power seems about right. But at low revs the throttle is sluggish and has a significant flat spot before the revs suddenly shoot up. I am aware that some of these symptoms sound like a lean condition caused by an air leak, but I have searched high and low and can not see any evidence of any sort of air leak in all the usual spots (caps, o-rings, throttle to manifold joints). Here is the background of the bike: I am the second owner. The bike had only done 500 miles when we picked it up from a local dealer despite being a 2006. Everything looks brand new, completely stock and untouched. The bike had never had its first service. We are aware that the bike had sat for a very long time at the dealer. When I got the bike I did the 600 mile book service except for checking the valve clearances. I also changed all fluids, plugs and air cleaner, although the plugs and air cleaner looked brand new when I removed them. I assumed that the carbs would be gunky after sitting so long and ran two cans of Seafoam through them. I did not remove the carbs and clean them, but I did lift the diaphragm and slide and removed one of the float bowls. Everything looked spotless there is no sign of gunk, gum, wear or damage anywere. The carbs have not been synched. The idle and hanging RPM problem makes the bike unridable. I bought it for my wife so that she could ride with me but I do not consider it safe for her as it is. Any ideas? Please keep in mind the very low miles and the factory-new appearance of everything. I just don't think this is caused by wear or deteriation of anything. Thanks in advance.

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  • lloydcliff Jan 01, 2011

    Thanks Joe, I was hoping to avoid having to actually pull them and do this, but there doesn;t see mmuch else left to try.

    What parts of the carby's would you suggest I actually replace versus clean?

    Based on the symptoms, specifically the hanging RPMs, what area of the carb would you focus on? For example; does it sound like its related to the diaphagm / slide, jets, float levels or something else?

    Cliff

  • lloydcliff Jan 03, 2011

    Thanks Joe. Based on the symptoms is there an area of the carb to focus on? (floats, jets, diaphragm) And what parts would you actually replace?



    The carby seems totally clean, what will rebuilding it do?

  • lloydcliff Jan 03, 2011

    Hi,



    Thanks for your reply.



    I will certainly pull the carbs and give them a good clean.



    Two follow up questions if I may;



    1. Is dirty carbs consistent with the RPM's hanging problem?

    2. Is there a part of the carb you would focus on based on the symptoms? (floats ,jets, diaphragm), and am I just cleaning or should I be replacing certain components as a matter of course?



    Thanks

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Carbs ,remove them and give a good clean ,the petrol has evaporated in them over time as obviously it was used --but sparsly -- so the petrol leaves a deposit in the jets and this is your problem ,now if your unsure of this procedure then ask a local mechanic to strip and clean them for you ,running fancy products through are a waste of time ,get them taken off and cleaned out old fashioned way and someone who knows what their doing to set them up which isnt difficult their is no magic about carbs only people not knowing what their doing ,Any mechanic of a older nature can do this for you with ease if they remember the vietnam war they will do this with one arm tied behind their back promise

Posted on Jan 01, 2011

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  • Master
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Hello lloyd...... definitely pull the carbs and rebuild them. Since you did everything else right, this alone should fix the problem. Joe
Thanks for choosing Fixya!

Posted on Jan 01, 2011

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