2006 Honda CR250r

7/23/2025 1:34pm
MX 707_ wrote:
Took it for it's first real ride and damn this things fast 😳 Very impressed by its low to mid hit, it's almost little to much...

Took it for it's first real ride and damn this things fast 😳 Very impressed by its low to mid hit, it's almost little to much. Think I prefer my 02's soft power delivery to this things low end hit. Gonna go smidge bigger on main jet but other then that things ready to ride. She is gonna be for sale next week or so but gonna do few more things but it's minor stuff.

If anyone is intrested in buying this, I work with a local bike shipper who can bring it anywhere within the US. This how she looks currently

Super sharp Good job.  A rad valve would add more low to mid all the expert sand riders ran that.  Hrc method on yt for adjusting the pv , it works.  It’s a Awesome sand racing bike .  Get alot of attention from sponsors = free stuff then. Like a Profeshenal rider. Lol 

3
Presley155
Posts
326
Joined
6/4/2012
Location
Littleton, CO, USA
7/24/2025 9:30am
What are you rebuilding on the caliper ?  Don’t you hv a 2-st class in Ma.  ?  Last yr it was the biggest class aprox 28...

What are you rebuilding on the caliper ?  Don’t you hv a 2-st class in Ma.  ?  Last yr it was the biggest class aprox 28 especially on the sand tracks in Wi.  Did you use the hrc method for adjusting the pv ?  I do on my 04 125. Dremel a paper thin amount of the hole out . That the pv shaft goes in.  Polish the rollers on the pv shaft too. You can get the pv operating soo smooth. A gear high in whoops or set rollers it hits & rips real quick , less chassis disruption than blasting on the mid range . I wish I had a 06 I woukd get the PC MC spec porting .  

MX 707_ wrote:
So I put in new caliper pistons, seals and media blasted the caliper. Thing came out really good.  Then bled the system. Brakes came to life...

So I put in new caliper pistons, seals and media blasted the caliper. Thing came out really good.  Then bled the system. Brakes came to life instantly.  Huh never heard the dremel trick but I did polish the pv shaft, kinda had to cause was little crusty. Thing absolutely barks to attention, definitely snappier then my 02 with the stock mikuni.

What Keihin carb are you running? I don't like the mikuni, I have it jetted fairly well, but I know it can be better. 

MX 707_
Posts
137
Joined
2/2/2022
Location
Worcester, MA, USA
7/25/2025 10:14am
Presley155 wrote:

What Keihin carb are you running? I don't like the mikuni, I have it jetted fairly well, but I know it can be better. 

This is a 38mm keihn pwk on this. My 02 with mikuni I feel same way as you do, think I've got jetting in a good spot but could be better, gonna go leaner on pilot and see what happens this weekend. The mikunis are tough, I've had some bikes that run awesome with them, 03 kx125, 02 rm125, 03 yz125, 17 husky tc250 mikuni was easy too. But now I've had 2 of these Gen cr with mikunis and they're ehh, could be better. For simplicity and not having to chase jetting as much I like the keihn

Wolfey
Posts
293
Joined
12/7/2015
Location
Marquette Heights, IL, USA
7/26/2025 9:25am
What are you rebuilding on the caliper ?  Don’t you hv a 2-st class in Ma.  ?  Last yr it was the biggest class aprox 28...

What are you rebuilding on the caliper ?  Don’t you hv a 2-st class in Ma.  ?  Last yr it was the biggest class aprox 28 especially on the sand tracks in Wi.  Did you use the hrc method for adjusting the pv ?  I do on my 04 125. Dremel a paper thin amount of the hole out . That the pv shaft goes in.  Polish the rollers on the pv shaft too. You can get the pv operating soo smooth. A gear high in whoops or set rollers it hits & rips real quick , less chassis disruption than blasting on the mid range . I wish I had a 06 I woukd get the PC MC spec porting .  

MX 707_ wrote:
So I put in new caliper pistons, seals and media blasted the caliper. Thing came out really good.  Then bled the system. Brakes came to life...

So I put in new caliper pistons, seals and media blasted the caliper. Thing came out really good.  Then bled the system. Brakes came to life instantly.  Huh never heard the dremel trick but I did polish the pv shaft, kinda had to cause was little crusty. Thing absolutely barks to attention, definitely snappier then my 02 with the stock mikuni.

Presley155 wrote:

What Keihin carb are you running? I don't like the mikuni, I have it jetted fairly well, but I know it can be better. 

I hated that mikuni on my 05 cr250r... I purchased a used 38mm air striker keihin that came on the 2005 kx250. Changed the needle, blocked the power jet and installed an oem kx throttle cable.Jetting it ended up being super easy and it never has needed any adjustments other than the air screw. Works perfectly
1

The Shop

MX 707_
Posts
137
Joined
2/2/2022
Location
Worcester, MA, USA
7/27/2025 8:58am
Wolfey wrote:
I hated that mikuni on my 05 cr250r... I purchased a used 38mm air striker keihin that came on the 2005 kx250. Changed the needle, blocked...
I hated that mikuni on my 05 cr250r... I purchased a used 38mm air striker keihin that came on the 2005 kx250. Changed the needle, blocked the power jet and installed an oem kx throttle cable.Jetting it ended up being super easy and it never has needed any adjustments other than the air screw. Works perfectly

I couldn't agree more, that's where I think the keihn has a real advantage that's it's not as sensitive to temp and alt change. Living here in new england we have a wide range of temps. Some days are 70, others are 90 with high humidity and the mikuni just struggles with that. Where with keihn it's usually a set it and forget it with little more then a pilot/ clip position change from spring to summer. Also like that I can get to the main and pilot through the bowl nut.

1
MX 707_
Posts
137
Joined
2/2/2022
Location
Worcester, MA, USA
8/10/2025 10:36am

Put finishing touches on this thing. Blew out dent in the pipe and heat treated it, re jetted it cause was little rich and put some showa fork stickers on. Here she is boys. Things sweet but with other projects going on and riding that 02, I just don't need two of these Gen hondas. Gonna make a great bike for someone!1000000127

6
MX 707_
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137
Joined
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Location
Worcester, MA, USA
8/10/2025 10:37am
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MX 707_
Posts
137
Joined
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Location
Worcester, MA, USA
8/10/2025 10:38am
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