2007 CR250?

wsc96 wrote:

Are the mods being done for the 03 much different than what people are doing for the 05-07? I realise there were quite a few engine...

Are the mods being done for the 03 much different than what people are doing for the 05-07? I realise there were quite a few engine changes for 04 and again in 05.

40 wrote:

The PC race fuel engine I rode had 13/48 gearing. It pulled that combo without any problem. With 48 on the rear, things start happening quickly...

The PC race fuel engine I rode had 13/48 gearing. It pulled that combo without any problem. With 48 on the rear, things start happening quickly in 5th gear.

H4L wrote:

wsc96 as mentioned above I've ridden an 06 with .025" milled off the base & imho it's not the route to go on the case reed...

wsc96 as mentioned above I've ridden an 06 with .025" milled off the base & imho it's not the route to go on the case reed engine for mods.. When these bikes 1st came out I did some testing with a local tuner with different pipe combos & cyl mods.. I didn't like the results till I used PC & was more than pleased with the mods for only $300 in 04.
I'm also running a JD ign. that PC programmed with their configured map to compliment the engine mods. The exhaust is a full Doma pipe / silencer combo that proved to be as good as it gets on a 2t 250 engine in my experience.

I've owned many 02-07 CR250r's with the exception of the 04 model & feel I'm somewhat well versed on these bikes.

wsc96 wrote:

Wasn’t questioning your knowledge and experience. The question was meant to understand if PC/Varner changed their approach with the 05 onward engine.

wsc96 wrote:

Wasn’t questioning your knowledge and experience. The question was meant to understand if PC/Varner changed their approach with the 05 onward engine.

H4L wrote:

Ok. My bad as I misread your post. From my understanding PC seems to have the same approach & don't know about Varner. He seems to...

Ok. My bad as I misread your post. From my understanding PC seems to have the same approach & don't know about Varner. He seems to have changed the amount of material he mills off the base from .030" to .010" from what I've seen. If your thinking of having either tuner due the work on the engine I'd suggest getting in contact with them about any inquiries. You can't go wrong with either tuner as both are reputable.

cslacker wrote:

I believe that Varner does similar work to both 02-04 & 05-07 cylinders when it comes to port height. I have his cylinder on my 03...

I believe that Varner does similar work to both 02-04 & 05-07 cylinders when it comes to port height. I have his cylinder on my 03 and I would recommend his work to anyone. We spoke for quite a while regarding the cr250's and he mentioned that lowering the ports significantly was a mistake. Mine was only lowered about .010". Port work was a thing of beauty.

I previously had a cylinder done by Gore and was never happy with the performance even after sending it back 3 times for changes. He lowered mine about .030 on his final attempt. It now sits in the corner of my garage.