Forum Main Tech Help/Race Shop CR250 Keihin Conversion - JD Jetting Help

CR250 Keihin Conversion - JD Jetting Help

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jonahdru222

Vital MX member jonahdru222 58365 jonahdru222 https://p.vitalmx.com/photos/users/58365/avatar/c50_bike10_1526305950.jpg?1526305013 https://www.vitalmx.com/community/jonahdru222,58365/all 06/30/17 19 35

Posts: 54

Joined: 6/30/2017

Location: Austin, TX USA

4/30/2018 10:48 AM

I have an 06 CR250 and the slide on my Mikuni is all broken at the bottom so I was just going to go ahead and do the Keihin conversion.

I have a few questions. First, does it use the same throttle cable? Second, does the TPS plug right into the CR plug? Lastly, does it use the same reed boot?

I plan on buying it through JD Jetting so I can get the JD jetting kit. Does the kit include tips on jetting if you have an aftermarket exhaust, or is it only for optimizing factory specs?

TIA

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omalley

Vital MX member omalley 53474 omalley https://p.vitalmx.com/photos/users/53474/avatar/c50_67433C3E_C55F_4D55_8FCE_404B6B5012A1_1538407240.jpg?1538406322 https://www.vitalmx.com/community/omalley,53474/all 07/27/16 1 33 1476 1

Posts: 1510

Joined: 7/27/2016

Location: Snohomish, WA USA

4/30/2018 12:55 PM

My JD carb for the 02 came with baseline specs, several needles, a couple mains and pilots, and charts for elevation. I don’t think it had anything for modifications.

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Mr Happy

Vital MX member Mr Happy 49093 Mr Happy /images/default/avatar/c50.png https://www.vitalmx.com/community/Mr-Happy,49093/all 10/09/15 4 201

Posts: 205

Joined: 10/9/2015

Location: GBR

4/30/2018 1:34 PM
Edited Date/Time: 4/30/2018 1:37 PM

Same cable and slots straight in to the standard inlet and air boot. Lube up the engine side though as it's a slightly larger diameter than the Mikuni, and the body is slightly longer so is a little more fiddly getting the air boot on with the subframe in place. Can't help with the TPS plug.

Can't help with jetting as the climate in the UK is more extreme than anything you'll experience, so the JD kit would be useless for me. I started with the standard settings for the RM250 although ended up a long way from that.

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jonahdru222

Vital MX member jonahdru222 58365 jonahdru222 https://p.vitalmx.com/photos/users/58365/avatar/c50_bike10_1526305950.jpg?1526305013 https://www.vitalmx.com/community/jonahdru222,58365/all 06/30/17 19 35

Posts: 54

Joined: 6/30/2017

Location: Austin, TX USA

5/4/2018 11:23 AM

Can anyone help with jetting? I'm in no way a jetting guru. Stock bore/stroke. PC pipe shorty exhaust. Straight VP T2 40:1. 500' elevation. Texas climate.

Says to start in the middle with the needles at Red #3 and a 172 main. Doesn't look like it came with pilots. What would be yalls recommendation? I know the fuel might change things up a bit.

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F150Motocrosser

Vital MX member F150Motocrosser 43588 F150Motocrosser https://p.vitalmx.com/photos/users/43588/avatar/c50_17796235_10102024645915556_4753952402108888194_n_1492578700.jpg?1492577931 https://www.vitalmx.com/community/F150Motocrosser,43588/all 06/24/14 1 178 3084 6 1

Posts: 3262

Joined: 6/24/2014

Location: Charlotte, NC USA

5/4/2018 1:06 PM
Edited Date/Time: 5/4/2018 1:07 PM

jonahdru222 wrote:

Can anyone help with jetting? I'm in no way a jetting guru. Stock bore/stroke. PC pipe shorty exhaust. Straight VP T2 40:1. 500' elevation. Texas climate.

Says to start in the middle with the needles at Red #3 and a 172 main. Doesn't look like it came with pilots. What would be yalls recommendation? I know the fuel might change things up a bit.

My recommendation would be to do exactly what "they" say and start with the needle clip in the middle position. How does it run? Noticeably lean? Or perhaps a little fat on the bottom? Also - how does your spark plug look? The answers to these questions will dictate your next move.

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