f4istunna
12-24-2007, 06:26 PM
Just wanted to see if you guys could possibly help me figure this problem out on my old ladies 400.
Im assuming it has to do w/ jetting but ive messed w/ it a few times and still cant get it.
Uni foam filter w/ lid & snorkel on, fmf slipon w/ stock header.
Now it has a k155 main and a 40 pilot, stock needle clip in middle (3rd down i think) i cant remember how many turns out the screw is but... i tried it from 1/2 out to almost 4 out and didnt make much diff. The plug is black when i check it and the coughing and chirping is making me think rich also. But the black plug could be from the rings because it smokes a bit also and needs a topend rebuild over winter.
It also pops and backfires on heavy decel Thats what got me confused. It wont stay idling for more than a few seconds. At full throttle seems to run good even half to 3/4 throttle is good. Just idle has the cough and so does up to about 1/4. the cough usually makes it stall.
I Had the stock 38 pilot in over summer and it still did the same thing :confused:
Hopefully someone w/ similar mods cant point me in the right direction as to where i should be w/ jetting.
Any help is much appreciated.
Im assuming it has to do w/ jetting but ive messed w/ it a few times and still cant get it.
Uni foam filter w/ lid & snorkel on, fmf slipon w/ stock header.
Now it has a k155 main and a 40 pilot, stock needle clip in middle (3rd down i think) i cant remember how many turns out the screw is but... i tried it from 1/2 out to almost 4 out and didnt make much diff. The plug is black when i check it and the coughing and chirping is making me think rich also. But the black plug could be from the rings because it smokes a bit also and needs a topend rebuild over winter.
It also pops and backfires on heavy decel Thats what got me confused. It wont stay idling for more than a few seconds. At full throttle seems to run good even half to 3/4 throttle is good. Just idle has the cough and so does up to about 1/4. the cough usually makes it stall.
I Had the stock 38 pilot in over summer and it still did the same thing :confused:
Hopefully someone w/ similar mods cant point me in the right direction as to where i should be w/ jetting.
Any help is much appreciated.