2012 CBR250R Race Bike - Honda CBR250R Forum : Honda CBR 250 Forums
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post #1 of 70 Old 11-25-2013, 08:35 PM Thread Starter
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2012 CBR250R Race Bike

Hello everyone! Im starting this thread to consolidate the information/pictures/videos I have out there about my bike and the mods I have done to it. Ill do my best to keep it up to date!

The day I picked it up:


Current:


Mods:
Yoshimura Rearset Brackets
Woodcraft Clip Ons
Leo Vince Corsa Carbon Full Exhaust
Jett Tuning Power Commander PCV

Bodywork:
MotoFairingsInc (eBay)

Tires:
Bridgestone Battlax BT-003

Videos:
A few laps on the CBR250R at Heartland Park Topeka

Planned Mods:
Sprockets (Not sure exactly which combo I want to run, yet)
Non O-Ring Chain
Racetech Springs/Emulators (Planning to contact Thermosman about this)
Preload Adjusters
Rear Shock (Not sure on which on to go with, yet)
R6 Throttle Tube (Shorter turn to get to full throttle)
Spiegler Brake Lines

Last edited by green_bread; 11-25-2013 at 10:09 PM.
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post #2 of 70 Old 11-26-2013, 02:43 PM
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Think you'll find a new front sprocket (13T), stiffer front springs with preload adjustments to front and rear will make a huge difference.

Keep your bike updates and track progress coming.
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post #3 of 70 Old 11-27-2013, 02:55 AM
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I was using a 13t front sprocket, but I switched back to stock gearing because I was maxed out on the front straight before the start/finish line at my home track.
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post #4 of 70 Old 11-27-2013, 11:07 AM Thread Starter
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Quote:
Originally Posted by 600k2 View Post
I was using a 13t front sprocket, but I switched back to stock gearing because I was maxed out on the front straight before the start/finish line at my home track.
This is my fear, as well. Im waiting to see where the club Im looking to race with next year will be running. I know one track that they usually run would benefit from the extra "umph" from the 13T front but I dont want to be changing out sprockets all the time, either. There is a pretty good chance that we will be running another track that has a very long front straight and if the Ninjas are getting up to 100+ and Im stuck at around 85 MPH, its going to suck.

I also need to get my tune in order with the bike. When I went to the Leo Vince full exhaust and the PCV, I got a lot more usable power in the mid range for coming out of corners but I lost 2-3 MPH on the top end. I will need to get around that issue before I would even think about switching sprockets and losing even more off the top end. I didnt plug the PAIR valve, so that might be part of the issue.
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post #5 of 70 Old 01-05-2014, 10:19 PM Thread Starter
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I'm open to suggestions for the best chain. You guys who have switched to the non o-ring chains have any recommendations?
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post #6 of 70 Old 01-05-2014, 11:03 PM
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I can tell you the brand I have when I get home.
I was unable to find any brand non o-ring chain with a rivet link, so keep in mind you have to safety wire the clip link properly. You don't want it to come loose.
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post #7 of 70 Old 01-05-2014, 11:26 PM Thread Starter
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Quote:
Originally Posted by 600k2 View Post
I can tell you the brand I have when I get home.
I was unable to find any brand non o-ring chain with a rivet link, so keep in mind you have to safety wire the clip link properly. You don't want it to come loose.
I'd appreciate it. Could you maybe also try to snap a pic of how you safety wired the clip, please?
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post #8 of 70 Old 01-06-2014, 12:43 AM
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Quote:
Originally Posted by 600k2 View Post
I was using a 13t front sprocket, but I switched back to stock gearing because I was maxed out on the front straight before the start/finish line at my home track.
Maybe add it into the back, ie go up to a 39. Also i remember a mod on this forum with header pipe and grinding the inside baffles. It gave some power back to the mid to top range.

Made an excel app that calculates all those things, and if you have a torque mapping for your bike shows best shift points.
https://www.cbr250.net/forum/cbr250-p...ets-tires.html

Last edited by sjdc1982; 01-06-2014 at 12:55 AM.
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post #9 of 70 Old 01-06-2014, 02:38 AM
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EK chain.


Last edited by 600k2; 01-06-2014 at 02:53 AM.
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post #10 of 70 Old 01-06-2014, 09:26 AM Thread Starter
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Thanks 600k2!
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