so im looking at jetting specs for 02 and 03 and later. the jetting specs show leaner jets for the 03 later, why is this? i can only imagine its because the needle differences? its it good to go to the later needle?
02 carb vs 03+ carb and jetting differences
- Thread starter ullose272
- Start date
i can't remember for sure but i don't think its just a needle deal the 02s had a little more hp and no decompresion hole i'm sure some one will tell you what the whole story is
You are right the difference is the needles. The '03+ needles are richer than the '02s so you could run the top end a lot leaner.
Mod motors have trouble living, especially at lower altitudes, with the '02 needles.
You can put the '03+ needles in the '02 carbs and then use the '03+ jetting chart.
sled_guy
Mod motors have trouble living, especially at lower altitudes, with the '02 needles.
You can put the '03+ needles in the '02 carbs and then use the '03+ jetting chart.
sled_guy
A
The 02 needle is 9dfh57
The 03 needle is 9dgn57
The 03 needle is .020 smaller at the tip, this tapper starts in the midrange out to wot and flows a lot of fuel.
This is why the leaner jetting.
The o3 needle works well at low throttle and wot. The problem with it is the very rich midrange, you can't get rid of it.
The 03 needle was poo's fix so they didn't have to do as much warenty work.
As far as the 02 needle not working at sea level, it works fine.
I run them in all my 800's as do my buddies. 02 engines 03 and 04.
160 hp engines with pump gas.
The 02 needle in a 04 engine gives instant throttle response in the midrange, 2-3 mpg better also. Perfect wash and plug color at any throttle position.
I ride western NY 500 - 2000 feet.
The 02 needle does require a 1.5 slide, some 03's like the prox had a 2.0, a little lean.
The 03 needle is 9dgn57
The 03 needle is .020 smaller at the tip, this tapper starts in the midrange out to wot and flows a lot of fuel.
This is why the leaner jetting.
The o3 needle works well at low throttle and wot. The problem with it is the very rich midrange, you can't get rid of it.
The 03 needle was poo's fix so they didn't have to do as much warenty work.
As far as the 02 needle not working at sea level, it works fine.
I run them in all my 800's as do my buddies. 02 engines 03 and 04.
160 hp engines with pump gas.
The 02 needle in a 04 engine gives instant throttle response in the midrange, 2-3 mpg better also. Perfect wash and plug color at any throttle position.
I ride western NY 500 - 2000 feet.
The 02 needle does require a 1.5 slide, some 03's like the prox had a 2.0, a little lean.
sooo is the 02 or the 03 needle better? im using a holtzman ATACC slp single pipe, cheater head, slp airbox, vf3 reads
D
'02 vs '03 needles
What elevation do you ride? I like the mid range fuel economy I can get with the 02 RMK 9DGJ3-57 needle at 2 clip position....I can run 360/370 mains (slp charts say 400/410) BUT I have EGT gauges....I ride 3500 to 8000' with SLP pipe and intake
What elevation do you ride? I like the mid range fuel economy I can get with the 02 RMK 9DGJ3-57 needle at 2 clip position....I can run 360/370 mains (slp charts say 400/410) BUT I have EGT gauges....I ride 3500 to 8000' with SLP pipe and intake
A
I like the 02 needle.
I run sealevel, ported, slp head, slp perf. single.
I run 540 mains.
5-10,000ft. fuel economy is nice but performance and reliability is most important
A
If I can make the 02 needle work at sealevel, it will definatlly work at high elevation. You won't see me running that dgn, pig rich, no throttle response needle.
Less air less hp, Its like 3% less hp for every 1000' elevation.
I have 7k miles on a engine right now with 02 needles.
You can't get performance and reliability at the same time.
Performance = close to the edge jetting = poor reliability if h20 temps go up, detonation.
Reliability = fat jetting in mid range and wot = less performance = safety factor as h20 temps go up.
i plan on running 20% av gas at all times as well as a precaution with the head
I wouldn't change the needles just to change the needles.
If you are running a Carl's Cycle 910 or SLP twins then I would highly recommend you change to the '03+ needles if you spend any time in the midrange.
And I don't have any problems with throttle response with the '03 needles.
sled_guy
If you are running a Carl's Cycle 910 or SLP twins then I would highly recommend you change to the '03+ needles if you spend any time in the midrange.
And I don't have any problems with throttle response with the '03 needles.
sled_guy
cool ill just get jets
D
I run 02 needles. Got about 4000 miles on them with no problems. As long as you are not riding like a kid holding the throttle in one spot for miles and keeping it jetted on the lean side it will be fine.
I had an 03 edge with struthers porting, psi twins, reeds, and gutted airbox, and I would not say that the 03 needles are rich in the midrange. My egt's would really climb in the midrange especially in the morning headed up the road, I had to be very carefull. I was also jetted on the edge though, I was running 380 on the pto and 390 on the mag at 3-6000 ft. I also had to run 20% 110 octane, I ran fine without it until I had it ported and then I took out a set of pistons due to detonation. So after that decided to run the 20% and was perfect from that point on.
i installed 03 needles and made no other changes to my 02. i saw very little change on the egt at any throttle position, but you could tell it was a hair richer, just a hair. a smaller difference i would say than if i was just to move the e clip one posistion down with the stock needles.
WOW! You can drop those mains alot. I ran 410's on my '02 with the same mods down to 2500ft.....figure 1 jet size for every 2000ft and/or 20*F, you should be more than safe with 450's and needle in the middle. JMHO- :beer;
A
Not a chance.
Wash and plug color are perfect with 540 mains.
Its ported
slp perf single
Timing advanced 1.5 degrees
25-38 gears
72 grams of wieght, daltons
F helix in the team
04 prox air box
158.8 hp at dynotech.
136'' track
Sled is probably 100 lbs heavier then most moutain sleds
I think my clutching and gearing really load the engine, it needs all of 540 mains. Could get away with 500's at times, but figure 1 hp per main jet.
T
I believe that the '02 needle, when in stock position, (middle clip?) at WOT can't flow more than what a 490 main jet can flow. The needle is too fat, or physically big, that it restricts flow.
If'n you throw 490's in a '02 motor then run it WFO on EGT's, get your readings, then pop in 540's and do the same, same EGT readings.
This is all from a few years ago. I got an 02 700, and I put the 03 needles in with twin pipes, run it down to 410's now, it's so so. If I could run a 2002 700 on the original needles with twin pipes down to 420's I might haveta look into that. My prob with the original needles was I was scared to run it at 490's without the needle up, so it didn't really come off throttle all too well.
My 03 800 I run an SLP single with 390's. stock 03 needles.
Both of these sleds are open intakes without the vac signal as well.
If'n you throw 490's in a '02 motor then run it WFO on EGT's, get your readings, then pop in 540's and do the same, same EGT readings.
This is all from a few years ago. I got an 02 700, and I put the 03 needles in with twin pipes, run it down to 410's now, it's so so. If I could run a 2002 700 on the original needles with twin pipes down to 420's I might haveta look into that. My prob with the original needles was I was scared to run it at 490's without the needle up, so it didn't really come off throttle all too well.
My 03 800 I run an SLP single with 390's. stock 03 needles.
Both of these sleds are open intakes without the vac signal as well.
A
Is this with the stock airbox, the 02 airbox is a nightmare
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T
Sorry, no. The 02 700 was in a 02 Edge but the airbox was totally custom handbuilt and was wide open, no plenum, no vac signal. The 800 is in a IQR with filter pods. The 700 is going into a IQR as well, most likely gonna go with pods on it.
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