Help w/ 03 cr250 air striker jetting

bh
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bh
Ok I’m at around 800 ft elevation and the temp is around 70 degrees I’m looking for a starting point. Right now I got a 42 pilot 168 main and the stock Honda needle in the 3rd position. On the top end it cuts out ever so slightly. I don’t know if I need to raise the needle or what. I’m sort of lost. I just put this setting in before I had a 170 main and 45 pilot and it was rich off bottom but eventually I could get it to clear out.
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captmoto
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captmoto 4/26/2019 7:35pm
4/26/2019 7:35pm
I think you need to go a little richer on your main. I thank I ran a 178 and a 45 slow jet. This jetting worked well in SoCal, 1000 to 3000 feet.
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H4L
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H4L 4/27/2019 8:40am
4/27/2019 8:40am
captmoto wrote:
I think you need to go a little richer on your main. I thank I ran a 178 and a 45 slow jet. This jetting worked...
I think you need to go a little richer on your main. I thank I ran a 178 and a 45 slow jet. This jetting worked well in SoCal, 1000 to 3000 feet.
I had similiar jetting specs as captmoto when I tested with a 00 Keihin PWK on an 03 CR2 about 10 yrs back.
NorCal - 32:1 HP2 premix, 0-1 K elevation, relatively no humidity, 70-90 deg. temps.
45 PJ
175 MJ
00 oem needle - A715/289R
3rd clip position
#7 slide
76 station 91 octane

Note: I tend to run the jetting a bit on the rich side for precautionary reasons.
digger
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digger 4/27/2019 1:13pm
4/27/2019 1:13pm
The guys above have you right about where you are going to wind up with an A715/289 needle, in your 03' cr250, #3 clip position, 42 pilot and 175 main. What you are going to run into, is that the 715/289 needle isn't a very clean running needle as compared to some other needles that are available. What are you trying to do with the bike, mx,off road, etc ? I can for sure get you onto a cleaner running needle/setup with power a little more suited to the type of riding you are doing.
bh
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bh 4/27/2019 1:32pm
4/27/2019 1:32pm
digger wrote:
The guys above have you right about where you are going to wind up with an A715/289 needle, in your 03' cr250, #3 clip position, 42...
The guys above have you right about where you are going to wind up with an A715/289 needle, in your 03' cr250, #3 clip position, 42 pilot and 175 main. What you are going to run into, is that the 715/289 needle isn't a very clean running needle as compared to some other needles that are available. What are you trying to do with the bike, mx,off road, etc ? I can for sure get you onto a cleaner running needle/setup with power a little more suited to the type of riding you are doing.
I primarily ride mx with the occasional trail ride. So probably 85% mx 15% trails and dicking around in the yard.

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bh
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bh 4/27/2019 1:36pm
4/27/2019 1:36pm
digger wrote:
The guys above have you right about where you are going to wind up with an A715/289 needle, in your 03' cr250, #3 clip position, 42...
The guys above have you right about where you are going to wind up with an A715/289 needle, in your 03' cr250, #3 clip position, 42 pilot and 175 main. What you are going to run into, is that the 715/289 needle isn't a very clean running needle as compared to some other needles that are available. What are you trying to do with the bike, mx,off road, etc ? I can for sure get you onto a cleaner running needle/setup with power a little more suited to the type of riding you are doing.
I primarily ride mx with the occasional trail ride. So probably 85% mx 15% trails and dicking around in the yard.
digger
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digger 4/27/2019 2:33pm
4/27/2019 2:33pm
bh wrote:
I primarily ride mx with the occasional trail ride. So probably 85% mx 15% trails and dicking around in the yard.
Ok, Then I would recommend that you use a Yamaha N3EJ needle in the #3 clip position, and start out with a 48 pilot jet, but it may need to be leaned out to a 45 in the warmer weather. Along with a 178 main, but again a 175 main may need to be used in the warmer temps. Set the air screw at 1.5 turns out from fully closed, and have at it.

needle part # https://www.partzilla.com/product/yamaha/4SR-14916-EJ-00?ref=51b86dc335…
bh
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bh 4/27/2019 3:39pm
4/27/2019 3:39pm
Alright thanks for the help guys I’m gonna give the Yamaha needle a shot and go up on the main
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15tc150
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15tc150 4/28/2019 9:37pm
4/28/2019 9:37pm
What # of slide is in it? I have run a 36 and 38 airstryker in my 03, and if it's got too rich of a slide, it will give you troubles getting your needle and main dialed in if your pilot is too rich. the 38 airstryker I was much higher in mains as well, around the 170-175 mark between seasons, 6.5 slide, needle in the 4th clip, and a 42 pilot. It ran, okay, but it liked to be ridden aggressively, the 36 was more fun, it was just better down low, and I felt it was the faster setup between the two carbs personally. But check your carb slide, 7 would be ideal, but I liked the 6.5 over the 7 for the extra little bit of response down low, and it helped get the pilot down a size so I could go up on the needle jet, and get pulling off the mainjet sooner in the rpm range.
15tc150
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15tc150 4/28/2019 9:42pm
4/28/2019 9:42pm
Also if you haven't replaced the stock 03 reed block, I'd suggest it as well, it leaves a lot to be desired, and ether v force or a rad valve help the 03 out a heck of a lot, as well as the 05 intake boot between the carb and the air box, the boot is a cheap replacement as well

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