Stock Pipe jetting woes
-
- Member
- Posts: 22
- Joined: 10:19 pm Nov 04 2011
- Country:
Thanks eveyone.
jbowens, thanks for the offer but I need to order some other stuff from Sudco anyway.
I'll try that DEL, although I believe it is out of the equation being WOT and all.
4vman1, let us know what you find, I am going to be ticked if I order a FMF woods pipe just to find out it goes ting, ting, ting and doesn't clean up my WOT problem, even if it makes more power!
jbowens, thanks for the offer but I need to order some other stuff from Sudco anyway.
I'll try that DEL, although I believe it is out of the equation being WOT and all.
4vman1, let us know what you find, I am going to be ticked if I order a FMF woods pipe just to find out it goes ting, ting, ting and doesn't clean up my WOT problem, even if it makes more power!
-
- Member
- Posts: 39
- Joined: 12:48 pm Nov 06 2011
- Country:
- Location: Syringfield, OR
In the past I've had a similar experience with the then called FMF "Burley" pipe if anybody remembers them, they're the same as a gnarly woods (I think). The Pro Circuit platinum made a good size difference, but I wouldn't call it a torque pipe. My only experience with a PC II was on my 07 KTM250xcw and it felt almost identical to the aluminum foil stocker. I've been told that the PC II is identical to the PC I only with thicker metal, whereas fmf has two different shaped pipes.
TS, if I wasn't going to send my parts to RB in a couple of weeks, I'd already have the CEL and DEL needles to gave a shot.
TS, if I wasn't going to send my parts to RB in a couple of weeks, I'd already have the CEL and DEL needles to gave a shot.
- G22inSC
- Supporting Member I
- Posts: 513
- Joined: 10:23 pm Jul 24 2006
- Country: United States
- Location: South Carolina
CEL vs. DEL.
I never can remember. Which needle is the "big hit" one and which is the "smooth and tractable" needle? Need to write it down somewhere for future reference.
I never can remember. Which needle is the "big hit" one and which is the "smooth and tractable" needle? Need to write it down somewhere for future reference.
'05 Kaw KDX200 ('00 KX125 forks / '02 RM125 Showa "K2" shock)
'14 Yam YZ125(x) (oldest boy's)
'22 Yam YZ125X (youngest boy's)
'17 Yam YZ85 (soon to be FOR SALE)
'10 Honda Recon (wife's)
'08 Kaw KX65 (Sold)
'07 KTM 50SX Sr. (Sold)
'09 Yam PW50 (retired)
'97 Kaw KX250 (Sold)
Gallery
2005 KDX200 Bike Profile
'14 Yam YZ125(x) (oldest boy's)
'22 Yam YZ125X (youngest boy's)
'17 Yam YZ85 (soon to be FOR SALE)
'10 Honda Recon (wife's)
'08 Kaw KX65 (Sold)
'07 KTM 50SX Sr. (Sold)
'09 Yam PW50 (retired)
'97 Kaw KX250 (Sold)
Gallery
2005 KDX200 Bike Profile
- Julien D
- KDXRider.net
- Posts: 5858
- Joined: 07:53 pm Nov 07 2008
- Country: USA
- Contact:
- fuzzy
- KDXRider.net
- Posts: 3437
- Joined: 01:29 pm Jun 18 2003
- Country:
- Location: Fredneck, MD
Others have you covered....the needle is where you should be looking.
The PCII I believe is a lower-midrange pipe vs the I which is more of a mid--rev (this would be consistent with stock XCW exhaust profile as well).
The PCII I believe is a lower-midrange pipe vs the I which is more of a mid--rev (this would be consistent with stock XCW exhaust profile as well).
Powerjets ADD fuel on the top end so you can run a proper main jet without fear of going lean on high load (sand), and long duration at WOT. They are sometimes TPS-solenoid activated.emulating one of those solenoid powerjet carbs that remove fuel on the topend by turnin on the solenoid above a certain rpm
'91 KDX 200 Project $300 KDX
'95 KDX 200 Project $600 KDX
'94 WR 250 Always a project
'95 KDX 200 Project $600 KDX
'94 WR 250 Always a project
-
- Member
- Posts: 22
- Joined: 10:19 pm Nov 04 2011
- Country:
I beg to differ,Powerjets ADD fuel on the top end so you can run a proper main jet without fear of going lean on high load (sand), and long duration at WOT. They are sometimes TPS-solenoid activated.
I believe you are referring to the dial-a-jet type of jetting addition, these are sometimes referred to as "Powerjets". They work by having a tube in the air stream like the OEM powerjet PWK carb, but they have no solenoid, they just suck it up on Bernoulli principle from the float bowl. If the float bowl fuel level were of the same height as the "powerjet" then it would fuel evenly all around, but because it has an inch or two of head, it fuels more at high air flows and less at low.
OEM PWK powerjets with the solenoid actually remove fuel at high RPM, they do this because OEMs have figured out they can get more overrev by leaning it out at high RPMs , as well as retarding timing.
- diymirage
- Supporting Member II
- Posts: 2909
- Joined: 05:00 pm Sep 19 2011
- Country:
- Location: michigan
JBowens, i wouldnt mind taking that needle of your hands if you feel like getting rid of it
(im running a bills pipe on a otherwise stock bike)
if you think the needle will improve performance on my bike let me know and ill drop you an email
(im running a bills pipe on a otherwise stock bike)
if you think the needle will improve performance on my bike let me know and ill drop you an email
newbbewb wrote:DIYmirage has it right.
-1996 KDX 200 woods weapon (converted to 99 green body)
-1996 KDX 200 plated street toy (barney edition)
-2003 Yamaha TTR125-L (wifeys bike)
-1997 KDX 220 project bike
- kdxmaniac
- Supporting Member
- Posts: 595
- Joined: 09:01 pm May 24 2010
- Country:
sounds like alot of trouble to me? but of course......i dont run the baja 500 either.....you say you dont see how the needle has anything to do with wot? is the needle not in the main?TurboStew wrote:I beg to differ,Powerjets ADD fuel on the top end so you can run a proper main jet without fear of going lean on high load (sand), and long duration at WOT. They are sometimes TPS-solenoid activated.
I believe you are referring to the dial-a-jet type of jetting addition, these are sometimes referred to as "Powerjets". They work by having a tube in the air stream like the OEM powerjet PWK carb, but they have no solenoid, they just suck it up on Bernoulli principle from the float bowl. If the float bowl fuel level were of the same height as the "powerjet" then it would fuel evenly all around, but because it has an inch or two of head, it fuels more at high air flows and less at low.
OEM PWK powerjets with the solenoid actually remove fuel at high RPM, they do this because OEMs have figured out they can get more overrev by leaning it out at high RPMs , as well as retarding timing.
my bikes
-------------
96 ktm 300
96 XR400R
07 hayabusa
77 kz 1000
85 goldwing 1200
02 BIG DOG PITBULL
gone but not forgotten
96 kdx 200
98 ktm 380 "because it dang near killed me!"
97 ktm 360
96 ktm 250
93 wr 250
94 dr 350s
93 kx 250
07 gsxr 1000
99 bandit 1200
-------------
96 ktm 300
96 XR400R
07 hayabusa
77 kz 1000
85 goldwing 1200
02 BIG DOG PITBULL
gone but not forgotten
96 kdx 200
98 ktm 380 "because it dang near killed me!"
97 ktm 360
96 ktm 250
93 wr 250
94 dr 350s
93 kx 250
07 gsxr 1000
99 bandit 1200
-
- Member
- Posts: 39
- Joined: 12:48 pm Nov 06 2011
- Country:
- Location: Syringfield, OR
Are you saying that the pipe was a bigger improvement than RB's head and carb mods? Or have you not been RB'd?TWMOODY wrote:Gotta agree here something was off here.scheckaet wrote:" I personally didn't feel a big bang for the buck with FMF Gnarley pipe"
then something must be off somewhere. Even with stock jetting the improvement was huge, even more after jetting it properly.
The FMF was the largest improvement of any engine mod I did to my kdf.
-
- Member
- Posts: 39
- Joined: 12:48 pm Nov 06 2011
- Country:
- Location: Syringfield, OR
- TWMOODY
- Gold Member
- Posts: 752
- Joined: 08:10 pm Dec 01 2006
- Country:
- Location: Southeast , Michigan
4vman1 wrote:Anybody? Is a FMF pipe a bigger improvement than RB's head and carb mods? They are roughly the same price, so inquiring minds would like to know. I need to have my Gnarly sent out and straightened anyways, but was going to get RB'd in a couple of weeks before I do that or just buy a new PCII.
-
- Member
- Posts: 39
- Joined: 12:48 pm Nov 06 2011
- Country:
- Location: Syringfield, OR
OK, thanks. Has anybody on here had there carb and head modded by RB and still use the stock pipe? Will there still be a big improvement? I'm sorry guys, I just wasn't all that impressed with the FMF Gnarly's performance, at least not enough that I liked it more than the indestructible, quiet, and total underdog look of the stocker.
-
- Member
- Posts: 22
- Joined: 10:19 pm Nov 04 2011
- Country:
Okay all,
Well after pondering the problem a while, I started thinking ignition problem. I re-cleaned the carb, pulled the flywheel for electrical inspection, everything fine on the ohm meter, advanced the timing about 1 degree, and swapped the coil with my KDX250 (same part number, 9 Kohm vs 11 Kohm, both in spec). It ran much better, I jetted it to 148 and she runs pretty good. She still has a little loss in power if lugging and go WOT, runs stronger if you back off to 1/2 throttle until the rpms pickup a bit. Played with the pilot and clips, doesn't seem to make much difference. I did too much crap to know exactly what it was, my suspicions are the coil, I plan to swap the coil back in soon.
Well after pondering the problem a while, I started thinking ignition problem. I re-cleaned the carb, pulled the flywheel for electrical inspection, everything fine on the ohm meter, advanced the timing about 1 degree, and swapped the coil with my KDX250 (same part number, 9 Kohm vs 11 Kohm, both in spec). It ran much better, I jetted it to 148 and she runs pretty good. She still has a little loss in power if lugging and go WOT, runs stronger if you back off to 1/2 throttle until the rpms pickup a bit. Played with the pilot and clips, doesn't seem to make much difference. I did too much crap to know exactly what it was, my suspicions are the coil, I plan to swap the coil back in soon.