Motorcycle Repair: idleing, suzuki katana 600, 1997 suzuki katana 600

Question
-------------------------
Followup To
Question -
i have a 1997 suzuki katana 600 it is idleing around 3000 rpm i have tried the throttle cable for adjustments and the choke cable and the idleing adjustment this problem did not accure untill i changed the choke cable and also before i changed it i had some inline fuel filters on it and it acted like the fuel was restricted so i took them off while i was changing the choke cable ... i just cant figure it out any help would be greatly appreciated ..thanks for your help . TIM
Answer -
Hi Timothy, it sounds like your choke cable is too short or misrouted. Take the cable off at the carb end and manually move the choke linkage to its fully closed position. Then start the engine and check idle speed. If the idle speed is back to normal then check the choke cable routing and or its length. Good luck thanks for asking
         craig
i have already tried that too the choke is fully closed any other advice? thanks. TIM

Answer
Hi Tim, if the cables are ok then lets think about vacuum leaks. When you removed the fuel filters and replaced the choke cable I wonder if you may have created a vacuum leak at one of the sync ports or one of the balance ports. Carefully inspect your work looking for the obvious hose disconnected or vacuum port unplugged somewhere. I have to assume that the idle adjuster has no affect but to raise the idle even more so that tells me that one or more of the carbs is drawing in unmetered air and holding the needle out of its jet thus rendering the idle circuit usless. Check to make sure when the engine is off the throttle snaps when released from Wide open, it should be crisp. Very carefully do a visual inspection of the entire carb assembly, some debris may have fallen down into your linkage or you could have a Frayed throttle cable. If that all looks good then I would double check my air mixture screws making sure they are all equal if the tamper plugs have been removed.  Try mixing up some dish washing detergent and warm water into a spray bottle, not too soapy, with the engine running spray around the carbs one at a time, if the idle suddenly drops you have found your vacuum leak. If none of this does a bit of good then the carbs will have to come off for tear down and inspect.  let me know Tim   good luck