Full Tilt CR250 Build - MXA Two Stroke Hall of Fame

rostocker wrote:

Hi BD, been a little quiet here ;) I’m just starting a “BD copycat el cheapo” and I hope you can help out with some bits...

Hi BD, been a little quiet here
I’m just starting a “BD copycat el cheapo” and I hope you can help out with some bits and pieces.
(it will have a full tranny and no titanium and less carbon)
I’ve gathered most of the parts needed so I’m waiting some tuning and cleaning before the assembly will start.
I will give the Zeeltronic a shot, so I wonder how you ended up with the wiring?
Can you show some pics of the final assy regarding electronics?

I’ll start my project documentation here on Vital as soon I get the engine back from everywhere...


/D

rostocker wrote:

Thanks! So where did the regulator (or whatever it is, the round rubbery one and the attached metal thingy) end up? What was the reasoning with...

Thanks!
So where did the regulator (or whatever it is, the round rubbery one and the attached metal thingy) end up?
What was the reasoning with changing the CDI away from air box again?

Nickel44 wrote:

Hi, have they now installed a vforce 3 or boysen rad valve? Which Intake Manifold did they use 03 or 04? Are there major differences in...

Hi, have they now installed a vforce 3 or boysen rad valve? Which Intake Manifold did they use 03 or 04? Are there major differences in vforce 3 for 02 and 03-04? Sorry for the bad google translation I am from germany

Nickel44 wrote:

Hi, thanks for the fast reply . I use a 02 engine with 03 cylinder, 02 vforce 3, doma 03, intake manifold 04 air boot 07...

Hi, thanks for the fast reply . I use a 02 engine with 03 cylinder, 02 vforce 3, doma 03, intake manifold 04 air boot 07. I hope it all goes well together

MXandSXracer21 wrote:

Are you still planning on selling the mapping you have obtained? How much does the zeeltronic setup cost? I didn't see a price on the website.

H4L wrote:

I've been running a similiar set up with excellent results for the past 14 yrs.. Have an 02 bottom end with a 03 PC Cyl. /...

I've been running a similiar set up with excellent results for the past 14 yrs.. Have an 02 bottom end with a 03 PC Cyl. / head mods, 03 VF2, 03 JD CDI, 03 Doma & 03 airboot. Back in 2004 the 03 Cyl. was considered to have the best oem porting specs by a few reputable tuners. Also own 06 & 07 CR250r models with the updated engine specs & prefer the 03 engine over them.
It's been a long time, but I recall the 02 reed cage being a 2 piece unit vs. the 03-04 that is a one piece. The 03-04 oem reed cage was designed like the CR500 cage with 8 petals vs. the 4 from the previous 02 yr..

I had an 02 as well & the airboot had an angle almost like a boomerang shape in comparison to the straighter 03 airboot.

NEW FOR 2003
New cylinder porting.
New eight-petal reed valve.
New air intake system offers straighter alignment to produce more direct airflow.
Redesigned number plate and inner duct.
New foam gasket between airbox and air boot for better sealing and airflow management.
New works-shaped expansion chamber.
New ignition timing settings help broaden the engine's powerband.[/list]

ENGINE:
Air intake boot is reshaped for more direct airflow, contributing to strong low-speed engine performance.

H4L wrote:

BD - I've also owned a 87,93, 97, 01, 02, 03, 05, 06, 07 models. I've never ridden or owned an 04 how does it compare...

BD - I've also owned a 87,93, 97, 01, 02, 03, 05, 06, 07 models. I've never ridden or owned an 04 how does it compare to the 03 ?
The 04 had different porting with an oval exhaust port on the cyl. & reconfigured bottom cases at the intake port where the reed cage goes in. It also had the 1st yr. shorter version tps mikuni with a 49t rear. Were those changes a noticeable difference over the 03 model ?

H4L wrote:

Can the same be said for the 02 cyl. after modifying the exhaust port ? It's been a few yrs since I looked at an 02...

Can the same be said for the 02 cyl. after modifying the exhaust port ? It's been a few yrs since I looked at an 02 cyl., but recall the exhaust port being smaller than the 03. Does Varner modify the powervalves for better sealing ?
PC reshaped the 03 PV's for better sealing in the exhaust port after they modified it.