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Pull the hex plugs and check suction valves. (archive)

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Posted by Nelson on June 26, 2001 at 12:40:56:

In Reply to: what did i do to my k-fisher?? (long) posted by tim on June 25, 2001 at 21:48:27:

i replace the O-rings on my k-fisher yesterday. now my 02 is running very poorly and (worst of all) i don't know why.
it's sputtering and running very rough - almost like one of the cylinders isn't firing or not getting the right fuel mix. i thought that maybe one of the plugs were fouled so i replaced them but still not fixed.
up to yesterday it was running great. the only thing that i did was to replace those O-rings so I got to thinking that I did something to the k-fisher when i was playing around with the float valves. i didn't do anything extreme just poked at them a bit with a small screwdriver to see what they looked like. i didn't do anything bizarre and i'm pretty sure i put it back the way it was. i reopened all four of the hex-headed bolts tonight to see if any of the float valves were turned sideways or something but all looked OK to me.
any ideas? i tried to make sure that i kept anything magnatized away from the whole thing while i was working on it.
it's got me pretty confused and disappointed at the moment -my baby was running great before this.
what do you think? any thoughts on what i may have done that is causing this rough running? i can only think that it's something to do with the float valves and/or hex-headed bolts. is it possible that one of the valves can be turned upside down somehow? the float valves and hex-headed bolts were really the only thing that i touched between my baby running great and running rough.
any insights?
i appreciate any thoughts anyone can offer. thanks again for all the advice.
72 tii

By pulling the spark plug wires one at a time you should be able to figure out which cylinder is having a problem. Then pull the corresponding hex plug and carefully remove the suction valve (DON'T USE A MAGNET!). Inspect where the suction valve sits and if you think any dirt got in there you might use some spray carb cleaner to try and clean it out. I think what may have happened was the suction valve got knocked off its seat. It must sit squarely on its seat. If you reassemble it and the problem remains try to swap two suction valves to different cylinders and see if the problem moves. Don't get worried, changing o-rings and removing suction valves is pretty routine.

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