cr250 2002 keihin carb setting

Alex_Konopisopoulos
I need for cr250 2002 with keihin 38mm from yz250 2017 the best carb setting
sea lever normal engine only scalvini exhaust system
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digger
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digger 8/6/2022 3:43am
8/6/2022 3:43am
Alex_Konopisopoulos wrote:
I need for cr250 2002 with keihin 38mm from yz250 2017 the best carb setting
sea lever normal engine only scalvini exhaust system
As an overall best setting, I would suggest, a 42 pilot, an NEDW needle in the 3rd clip position along with a 172 main jet and set the air screw at 1.5 turns out.
Make sure that the power jet, the jet or jet hole itself is plugged, The TPS does not need to be used if you don’t want to hook it up.
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motoxrocks
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motoxrocks 8/6/2022 5:58am
8/6/2022 5:58am Edited Date/Time 8/6/2022 6:12am
On the 05-07 CR 250 i really liked the stock N3EW YZ needle. It gave it a really nice spread of power vs other needles i tried. You could try the stock YZ jetting with the PJ blocked and adjust from there? Memory is not what it used to be but i believe i ran it on a 03 CR 250 as well?
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40
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40 8/18/2022 7:11am
8/18/2022 7:11am
digger wrote:
As an overall best setting, I would suggest, a 42 pilot, an NEDW needle in the 3rd clip position along with a 172 main jet and...
As an overall best setting, I would suggest, a 42 pilot, an NEDW needle in the 3rd clip position along with a 172 main jet and set the air screw at 1.5 turns out.
Make sure that the power jet, the jet or jet hole itself is plugged, The TPS does not need to be used if you don’t want to hook it up.
Be reminded that the 02 and 03 CR250 ECU's do not have the ability to run the TPS.
The powerjet circuit advice is good.

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GoggleFiend904 8/18/2022 11:19am
8/18/2022 11:19am
I just picked up a 99 kx250 carb that I plan on running on my 04 CR. Does anyone have the contact info for the guy that makes the TPS harness/adapter?
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digger 8/18/2022 5:02pm
8/18/2022 5:02pm Edited Date/Time 8/18/2022 9:21pm
GoggleFiend904 wrote:
I just picked up a 99 kx250 carb that I plan on running on my 04 CR. Does anyone have the contact info for the guy...
I just picked up a 99 kx250 carb that I plan on running on my 04 CR. Does anyone have the contact info for the guy that makes the TPS harness/adapter?
Hooking the TPS back up is not necessary. I bet 98% of the people using those bikes would have no idea it wasn't hooked up/not working. If you must have it hooked up here's the conversion info.

Keihin black to Mikuni green
Keihin Yellow to Mikuni yellow/black
Keihin blue to Mikuni yellow/ red

Connectors: https://easternbeaver.com/Main/Elec__Products/Connectors/Sealed/SM-HM/s…

Make sure the power jet passage way is blocked, as you will not be using the power jet on the CR.

Make sure that you do have a carb from 99' KX250, as that was one of the few years that came with a #7 slide. Most of the other years KX250's came with a #8 slide, which would require slightly different jetting specs, or the use of a different slide.
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digger
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digger 8/18/2022 5:34pm
8/18/2022 5:34pm
Alex_Konopisopoulos wrote:
The basic problem stock TMX (CR250 02-03 ) is about 10mm longer to YZ and don't fit
if he wants to use the carb from the 17' YZ250 , on his 02' CR, he's going to need the air boot,( from air box to carb), off an 04-07' bike.
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GoggleFiend904 8/18/2022 6:31pm
8/18/2022 6:31pm
GoggleFiend904 wrote:
I just picked up a 99 kx250 carb that I plan on running on my 04 CR. Does anyone have the contact info for the guy...
I just picked up a 99 kx250 carb that I plan on running on my 04 CR. Does anyone have the contact info for the guy that makes the TPS harness/adapter?
digger wrote:
Hooking the TPS back up is not necessary. I bet 98% of the people using those bikes would have no idea it wasn't hooked up/not working...
Hooking the TPS back up is not necessary. I bet 98% of the people using those bikes would have no idea it wasn't hooked up/not working. If you must have it hooked up here's the conversion info.

Keihin black to Mikuni green
Keihin Yellow to Mikuni yellow/black
Keihin blue to Mikuni yellow/ red

Connectors: https://easternbeaver.com/Main/Elec__Products/Connectors/Sealed/SM-HM/s…

Make sure the power jet passage way is blocked, as you will not be using the power jet on the CR.

Make sure that you do have a carb from 99' KX250, as that was one of the few years that came with a #7 slide. Most of the other years KX250's came with a #8 slide, which would require slightly different jetting specs, or the use of a different slide.
I appreciate the info. I don’t have a problem with the TMX, just going to search for a little more low end power. I bought the carb off eBay and was listed as a 99. I wanted to atleast give it a try because I plan on getting another 3rd gen cr
Bruce372
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Bruce372 8/18/2022 7:42pm
8/18/2022 7:42pm
Alex_Konopisopoulos wrote:
The basic problem stock TMX (CR250 02-03 ) is about 10mm longer to YZ and don't fit
You either need a different boot, or get the screw top pwk ajrstryker that's longer. Check 2000 cr250 I think it's that one? Check, its been a while
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rteixeira
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rteixeira 10/4/2022 2:26pm
10/4/2022 2:26pm
Alex_Konopisopoulos wrote:
I need for cr250 2002 with keihin 38mm from yz250 2017 the best carb setting
sea lever normal engine only scalvini exhaust system
digger wrote:
As an overall best setting, I would suggest, a 42 pilot, an NEDW needle in the 3rd clip position along with a 172 main jet and...
As an overall best setting, I would suggest, a 42 pilot, an NEDW needle in the 3rd clip position along with a 172 main jet and set the air screw at 1.5 turns out.
Make sure that the power jet, the jet or jet hole itself is plugged, The TPS does not need to be used if you don’t want to hook it up.
What would a good a starting point for jetting 38mm pwk cr265 mostly trail ride between 2-4K feet
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digger 10/4/2022 4:00pm
10/4/2022 4:00pm
rteixeira wrote:
What would a good a starting point for jetting 38mm pwk cr265 mostly trail ride between 2-4K feet
Needle-- NECW in #3 clip position
pilot--42
main--170
Air screw---1.5

This is assuming you are using an 02'--07' engine, and the carb is using a #7 slide in 60f--90f weather

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