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02-04-2010, 04:52 PM
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#11
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Junior Member
Feedback Score: 0 reviews
Join Date: Dec 2007
Posts: 27
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My vforce runs like crap too. i think im having the same issue, at idle it seems to miss, and it misses all the time. less if i put the choke on all the way.
Could it be the exhaust? ive checked all electronics, even sprayed out carbs multiple times and all is good.
Any help would be good.
Thanx,
Lance
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02-04-2010, 06:34 PM
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#12
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Junior Member
Feedback Score: 1 reviews
Join Date: Jul 2009
Location: long island ny
Posts: 23
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backfiring
i fixed the problem i cleaned the carbs and adjusted the air/fuel mixture and that took care of the problem
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02-05-2010, 06:39 AM
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#13
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Member
Feedback Score: 1 reviews
Join Date: Dec 2009
Location: Bakersfield, Havasu
Posts: 52
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I've had the same problem, the intake valve on the rear cylinder was slightly too tight, and the jets needed to be opened up. Still haven't put the washers on the needles, that's this weekend. Popping is getting better.
__________________
2004 KFX 700, Quadzilla (green), Muzzy pipe, Twin-Air filter, 42.5 pilots, 155f, 160r jets, screws out 2.5 turns, 6* key, White bros CDI, 2 washers on needles, polished slides. Carbon fiber snorkel/scoop.
2004 KFX 700, Pumpkin (orange), FMF pipe, repacked FMF Titanium 4 muffler with "quiet" insert, K&N/Outerwears filter, 40 pilots, 145 f, 150 r jets, screws out 1.75 turns, washer on needles, polished slides.
Both airboxes modified by cutting out the "wall". 
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02-10-2010, 04:55 PM
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#14
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Junior Member
Feedback Score: 0 reviews
Join Date: Dec 2007
Posts: 27
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ya but mine doesn't neccesarilly pop, it misses alot and wont idle, the valves were checked less then 20 hours prior to this happening, but it would be hard to start if it were the valves right? because it starts like a charm
Thanx guys for any info that you can give me, as i want to get out and ride asap
Thanx,
Lance
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02-10-2010, 11:18 PM
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#15
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Member
Feedback Score: 1 reviews
Join Date: Dec 2009
Location: Bakersfield, Havasu
Posts: 52
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Turn the mixture screws out 1/4 turn, see if that helps. If so, then look at changing jetting, if not, put it back and keep looking. My valves were a tiny bit too tight on the back intake which caused a lot of backfiring. The backfiring caused the front carb to pop off the intake boot, changing the symptoms while I was troubleshooting. Very frustrating. Jusr keep at it, and only change one thing at a time.
__________________
2004 KFX 700, Quadzilla (green), Muzzy pipe, Twin-Air filter, 42.5 pilots, 155f, 160r jets, screws out 2.5 turns, 6* key, White bros CDI, 2 washers on needles, polished slides. Carbon fiber snorkel/scoop.
2004 KFX 700, Pumpkin (orange), FMF pipe, repacked FMF Titanium 4 muffler with "quiet" insert, K&N/Outerwears filter, 40 pilots, 145 f, 150 r jets, screws out 1.75 turns, washer on needles, polished slides.
Both airboxes modified by cutting out the "wall".
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