Where did the power go?
#1
03-15-2008 | 09:13 PM
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Joined: Feb 2008
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Where did the power go?
After jetting the carb and putting the header on I seem to have lost all the power! The carb is:
128 main
needle on the 2nd slot
Kouba fuel screw 2 turns out.
I first jetted the carb and rode it and it pulled great through all the gears up to red line. Today I put the header on and it seems to have lost all throttle response. Any idea's? Could having the diapraghm exposed to long and maybe it expanding cause this? I'm reaching......
128 main
needle on the 2nd slot
Kouba fuel screw 2 turns out.
I first jetted the carb and rode it and it pulled great through all the gears up to red line. Today I put the header on and it seems to have lost all throttle response. Any idea's? Could having the diapraghm exposed to long and maybe it expanding cause this? I'm reaching......
#3
03-15-2008 | 10:33 PM
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Joined: Oct 2006
Posts: 3,106
From: Misawa Japan
1st Gear Member
RE: Where did the power go?
ORIGINAL: JS Kawi Dude
After jetting the carb and putting the header on I seem to have lost all the power! The carb is:
128 main
needle on the 2nd slot
Kouba fuel screw 2 turns out.
I first jetted the carb and rode it and it pulled great through all the gears up to red line. Today I put the header on and it seems to have lost all throttle response. Any idea's? Could having the diapraghm exposed to long and maybe it expanding cause this? I'm reaching......
After jetting the carb and putting the header on I seem to have lost all the power! The carb is:
128 main
needle on the 2nd slot
Kouba fuel screw 2 turns out.
I first jetted the carb and rode it and it pulled great through all the gears up to red line. Today I put the header on and it seems to have lost all throttle response. Any idea's? Could having the diapraghm exposed to long and maybe it expanding cause this? I'm reaching......
#4
03-15-2008 | 10:56 PM
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Joined: Mar 2007
Posts: 1,534
From: The RIGHT coast
RE: Where did the power go?
the stock header is smaller in diameter and gives a bit more throttle response because of the back pressure it creates. the fmf header is larger in diameter and flows more air so you lose some of that back pressure. i thinkthat's what your feeling.
#5
03-16-2008 | 02:15 AM
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RE: Where did the power go?
I don't think it's just some loss of back pressure. It barely pulls at all in any gear and it revs completely different than before. A lot slower......basically there is little to no throttle response. Any ideas?
#6
03-16-2008 | 04:44 AM
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Joined: Mar 2007
Posts: 1,534
From: The RIGHT coast
RE: Where did the power go?
no not really but i'd put the stock header back on and see what happens. if it's still not pulling i'd then go to the carb to see if everything is fine in there. i'd double check everything i did just to be sure nothing came loose or fell out. sounds far fetched but it could happen.
#7
03-16-2008 | 04:50 AM
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Posts: 600
RE: Where did the power go?
When I installed my FMF system my bike ran noticably better across the entire RPM scale.
Are you still using the stock snorkel? (as Dean asked).
Is there an obstruction in the header?
Are you still using the stock snorkel? (as Dean asked).
Is there an obstruction in the header?
#8
03-16-2008 | 05:02 AM
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Joined: May 2006
Posts: 3,332
RE: Where did the power go?
I'd bet you got the needle setting F'up 
....been there done that..lol. Check your washer/clip position....a tiny bit makes a HUGE difference....especially if the washer is on the wrong side ofda clip..
....been there done that..lol. Check your washer/clip position....a tiny bit makes a HUGE difference....especially if the washer is on the wrong side ofda clip..
#9
03-16-2008 | 05:06 AM
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Joined: Mar 2007
Posts: 1,534
From: The RIGHT coast
RE: Where did the power go?
he said that it ran fine with the stock header though. does the fmf header flow so much air that his needle postion would work with one header and not the other??
