950 smr hestitation, missing, surge... mid rpm - KTM Forums: KTM Motorcycle Forum
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post #1 of 3 (permalink) Old 03-18-2016, 09:29 PM Thread Starter
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950 smr hestitation, missing, surge... mid rpm

... having issue... usually occurs in 3 rd gear on up. Read the "canisterectomy" thread (somewhere), have looked into what version i have of charcoal canister etc... i think i don't have the canister, although i think i have the gas tank and carb vents that have vacuum valves (diverter) (when running or not?). after reading up on it, i then looked at some photos of my bike from when i cleaned the aircleaner. I discovered in the photo .... that there is a hose going to the side of the rear carb...not connected to the vacuum actuator that moves the "slide" in the carb throat? (guessing). (see photo, zoom in on yellow highlight and comment) With that detached, i am surprised it runs good in second and first gear? Anyone out there think that is my problem... or once i fix that... i need to look for other leaks (based on the symptom of hesitation in the higher gears) ? thx....steve
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post #2 of 3 (permalink) Old 11-26-2016, 12:36 PM
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Did you fix the hesitation symptom?

current -2007 690SM
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post #3 of 3 (permalink) Old 11-26-2016, 11:23 PM Thread Starter
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In fact, a couple of months later, tore into it again.. thinking i was going to have to remove the carburetor set, tear down... and kind of rebuild...check seals etc... However, upon removing air cleaner etc... i noticed the front carb vacuum hose, that moves the "slide"... was also disconnected... but it was very hard to see, below some electrical wires etc... I plugged that back in ... checked everything over... and that was the issue. The bike now runs as it should. If you open up throttle in first and second gear (no snap release of clutch), when you hit power/torque band... you have to consciously keep the front wheel down by leaning forward. Big difference in power. Not sure why previous owner had those two vacuum hoses disconnected from cv carb slides?). I kind of wonder if it was a "governing" effect to keep him "in control".

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