Carb bore, slide size relitive to needle and jetting.
- krazyinski
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Carb bore, slide size relitive to needle and jetting.
I like many others read a lot of threads on jetting and mods. I have noticed a lot of threads regarding RB carb mods and jetting and tunning. there at times recommendations made on needle size or type. I have played with many needles on my bike B, C, D needles. how ever and have settled on the C needles. D needles are to rich to use in a stock carb bored out to 36mm with 5 slide . most of the best detailed info has com from you that have a RB carb with leaner slide. This took a while for me to figure out. does not seem as if there is that many on this forum running Fredette mods.
2000 KDX220 FRP Ported,plated cylinder,milled head, FRP bored carb, V force 3 reeds, FMF desert pipe, 10oz FWW, 98 KX forks and oem shock re valved by Pro Action, hyd clutch, fastway pegs, tall seat foam, gripper cover, 29" CRhigh mini bars, Cycra brush gaurds.
- m0rie
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Do you happen to have a log of the needles (and jetting) you have a tried, clip positions and what the results were?
1989 KDX 200
2007 TTR-50E
2007 TTR-50E
- krazyinski
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yes I have.
bike info 220 nikasil cylinder, ported, milled head,carb bored to 36mm
fmf woods pipe, power core 2 can.
temps 90-99 humidity 40% 700 ft ^sea
fuel 40:1
pilot , needle , main , air screw , results
45 - 1173-3 - 160 - 3 - rich at 1/8 to 1/4 with a big hit
45 - DEM-3 - 155 - 3 - good 0-1/8 flat spot 1/4-1/2, less top end
42 - Dem-2 - 155 - 2-2 1/2 - rich at 1/4 - 1/2 may be to fast of taper lean 3/4 to wot plug chp shows lean.
42 - cek-3 - 155 - 2+-1/2 - rich at 1/4 ok on the rest still to rich get the drips big time feels flat on wot
42 - del-3&2 - 155 - 2 - feels same as dem to rich
42 - cel-2 - 155 - 2 - does not want to idle at working temps, throttle response good, still drips
42 - cem-3 - 155 - 2+-1/2 - pulls hard a gear to high
after a lot of on off 0-1/4 throttle it has a 1/4-1/2 rich stumble.
42 - cem-2 - 158 - 2+-1/2 - crisp off idle response, will pull corners in third with good solid power,(no stuble,studders or bogging) top end feels unlimitted or faster than I want to go. plug read is moca brown. still get the drips a little, not bad.
42 - cgm - 158 --2-- this is the perfect summer setup the bike runs perfect top to bottom in 90 degree 40% humidity weather.
bike info 220 nikasil cylinder, ported, milled head,carb bored to 36mm
fmf woods pipe, power core 2 can.
temps 90-99 humidity 40% 700 ft ^sea
fuel 40:1
pilot , needle , main , air screw , results
45 - 1173-3 - 160 - 3 - rich at 1/8 to 1/4 with a big hit
45 - DEM-3 - 155 - 3 - good 0-1/8 flat spot 1/4-1/2, less top end
42 - Dem-2 - 155 - 2-2 1/2 - rich at 1/4 - 1/2 may be to fast of taper lean 3/4 to wot plug chp shows lean.
42 - cek-3 - 155 - 2+-1/2 - rich at 1/4 ok on the rest still to rich get the drips big time feels flat on wot
42 - del-3&2 - 155 - 2 - feels same as dem to rich
42 - cel-2 - 155 - 2 - does not want to idle at working temps, throttle response good, still drips
42 - cem-3 - 155 - 2+-1/2 - pulls hard a gear to high
after a lot of on off 0-1/4 throttle it has a 1/4-1/2 rich stumble.
42 - cem-2 - 158 - 2+-1/2 - crisp off idle response, will pull corners in third with good solid power,(no stuble,studders or bogging) top end feels unlimitted or faster than I want to go. plug read is moca brown. still get the drips a little, not bad.
42 - cgm - 158 --2-- this is the perfect summer setup the bike runs perfect top to bottom in 90 degree 40% humidity weather.
Last edited by krazyinski on 07:46 pm Aug 02 2006, edited 2 times in total.
2000 KDX220 FRP Ported,plated cylinder,milled head, FRP bored carb, V force 3 reeds, FMF desert pipe, 10oz FWW, 98 KX forks and oem shock re valved by Pro Action, hyd clutch, fastway pegs, tall seat foam, gripper cover, 29" CRhigh mini bars, Cycra brush gaurds.
- m0rie
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This is with Fredette porting and a Fredette bored PWK correct? 36mm with no divider plate or slide modifications?
1989 KDX 200
2007 TTR-50E
2007 TTR-50E
- krazyinski
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yesm0rie wrote:This is with Fredette porting and a Fredette bored PWK correct? 36mm with no divider plate or slide modifications?
2000 KDX220 FRP Ported,plated cylinder,milled head, FRP bored carb, V force 3 reeds, FMF desert pipe, 10oz FWW, 98 KX forks and oem shock re valved by Pro Action, hyd clutch, fastway pegs, tall seat foam, gripper cover, 29" CRhigh mini bars, Cycra brush gaurds.
-
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give this one a shot
42 - cgm - 158 --2-- this is the perfect summer setup the bike runs perfect top to bottom in 90 degree 40% humidity weather.
We ride in similar condition and I have had the same experiences with all the commonly recommended needles. For the most part they are too rich down low and sometime create idling issues.
I recently moved to a CEN needle and have had great success. A strong bottom end, good idle and great pull through the powerband. If you have not tried this needle I would give it a shot.
Bike Info
1997 kdx200
38 pilot
155 main
CEN needle
1.75 on air screw
Rad Valve
No porting
Stock 35 mm carb
We ride in similar condition and I have had the same experiences with all the commonly recommended needles. For the most part they are too rich down low and sometime create idling issues.
I recently moved to a CEN needle and have had great success. A strong bottom end, good idle and great pull through the powerband. If you have not tried this needle I would give it a shot.
Bike Info
1997 kdx200
38 pilot
155 main
CEN needle
1.75 on air screw
Rad Valve
No porting
Stock 35 mm carb
- krazyinski
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- Location: San Antonio Texas
I will give it a shot, it seems as if the porting is a big player in my jetting. for the past few months I have raised the needle to compensate for the cooler temps.
2000 KDX220 FRP Ported,plated cylinder,milled head, FRP bored carb, V force 3 reeds, FMF desert pipe, 10oz FWW, 98 KX forks and oem shock re valved by Pro Action, hyd clutch, fastway pegs, tall seat foam, gripper cover, 29" CRhigh mini bars, Cycra brush gaurds.
- fuzzy
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