Starting the mod process - Page 5 - Honda CBR250R Forum : Honda CBR 250 Forums
» Sponsors
Reply
 
LinkBack Thread Tools
Old 11-20-2012, 12:54 AM   #41
Senior Member
 
loserlazer's Avatar
 
Join Date: Nov 2011
Location: Bangkok
Posts: 175
Thanks: 12
Thanked 40 Times in 12 Posts
Default

Quote:
Originally Posted by BBRMotosports View Post
Got all the parts I need today. Got the new rings on and piston and cylinder installed. Now I just need time to do the head work.

go on bbr,
i really enjoy this thread. but please more info!
loserlazer is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Sponsored Links
Advertisement
 
Old 11-24-2012, 04:55 PM   #42
Senior Member
 
BBRMotosports's Avatar
 
Join Date: Sep 2011
Location: Rhinelander WI
Posts: 1,116
Thanks: 67
Thanked 349 Times in 173 Posts
Default

What kind of info do you want? I havent had time to start working on the head. Hopefully next week.
__________________
2011 CBR250R, Modded 84 honda spree, 2013 CBR500R 2014 Grom

https://www.facebook.com/centertrackperformance
BBRMotosports is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 11-25-2012, 08:23 PM   #43
Member
 
Join Date: Aug 2011
Posts: 49
Thanks: 8
Thanked 27 Times in 9 Posts
Default

Thanks for documenting you mods! I am thinking about doing some similar ones this winter. Had you considered doing a Bore up to 297cc with a JE Piston? HONDA - 2011-2012 CBR 250R - JE Pistons

Keep up the good work!
msvec is online now  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 11-25-2012, 08:50 PM   #44
Senior Member
 
BBRMotosports's Avatar
 
Join Date: Sep 2011
Location: Rhinelander WI
Posts: 1,116
Thanks: 67
Thanked 349 Times in 173 Posts
Default

I don't want to change the bore but If I knew JE made a higher compression piston I would have went that route. I emailed them a while back and they told me they wernt going to do anything with the 250. I wonder how much the piston kit is.
__________________
2011 CBR250R, Modded 84 honda spree, 2013 CBR500R 2014 Grom

https://www.facebook.com/centertrackperformance
BBRMotosports is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 11-26-2012, 01:15 PM   #45
Member
 
Join Date: Aug 2011
Posts: 49
Thanks: 8
Thanked 27 Times in 9 Posts
Default

Not sure the price for the std bore piston with a slightly higher ratio but the 297cc Piston, 11.0:1 ratio is $205.52 (Piston, rings, piston pin and lock ring).
msvec is online now  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 11-27-2012, 09:26 PM   #46
Senior Member
 
Join Date: Jul 2012
Location: North Lauderdale, FL.
Posts: 290
Thanks: 0
Thanked 38 Times in 35 Posts
Default

I think it's cool and trying to improve performance on the model. I know sometimes alot of motorcycle manufactures don't release the FULL amount of performance of the engine. They don't want an alot none mechanical people in there. But it seems you have tapped in and I want to see the end results as well! Please keep us posted of what you're doing! I'M very very interested!!
my250cbrgeo is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 11-27-2012, 10:01 PM   #47
Senior Member
 
BBRMotosports's Avatar
 
Join Date: Sep 2011
Location: Rhinelander WI
Posts: 1,116
Thanks: 67
Thanked 349 Times in 173 Posts
Default

I will keep you guys posted. I might have time tomorrow to deck the head and cut the seats.
__________________
2011 CBR250R, Modded 84 honda spree, 2013 CBR500R 2014 Grom

https://www.facebook.com/centertrackperformance
BBRMotosports is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 11-27-2012, 11:46 PM   #48
Senior Member
 
loserlazer's Avatar
 
Join Date: Nov 2011
Location: Bangkok
Posts: 175
Thanks: 12
Thanked 40 Times in 12 Posts
Default

i have nothing particular to ask but just want to see you get more progress on it.
good work again.
loserlazer is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 11-28-2012, 09:22 PM   #49
Senior Member
 
BBRMotosports's Avatar
 
Join Date: Sep 2011
Location: Rhinelander WI
Posts: 1,116
Thanks: 67
Thanked 349 Times in 173 Posts
Default

All right guys and gals. Since everything i have in the shop i'm waiting on parts for I had some time to work on my own bike!.

I started buy cleaning up the head. After I got everything cleaned up I decked the head for some higher compression. Then I cut the valve seats. The reason I had to cut the valve seats was because they were pitted pretty bad. The bike only has 5000 miles on it but this is another good reason to hate ethenol!. So now the valves will seal correctly.
Here are a few pictures. I still have a good 4-5 hours of porting to do on the head. As you can see in the pictures the castings are really rough thus slowing down air flow both into the engine and out. When I am done the exhaust side will look like a mirror. and the intake side will be cleaned up but have a bead blasted texture to help with the air/ fuel mix.









__________________
2011 CBR250R, Modded 84 honda spree, 2013 CBR500R 2014 Grom

https://www.facebook.com/centertrackperformance
BBRMotosports is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Old 11-28-2012, 10:45 PM   #50
Member
 
Join Date: Aug 2012
Posts: 83
Thanks: 0
Thanked 25 Times in 14 Posts
Default

How much did you take off the head and what compression ratio are you shooting for?
racerrrrx is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote
Sponsored Links
Advertisement
 
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Powered by vBadvanced CMPS v3.2.2



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.5.2
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.
Motorcycle News, Videos and Reviews
Honda Grom Forum Harley Davidson Forum Honda 600RR Kawasaki Forum Yamaha R6 Forum Yamaha FZ-09 Forum
1199 Panigale Forum Roadglide Forum Honda CBR1000 Forum Vulcan Forum Yamaha R1 Forum Yamaha R3 Forum
Ducati Monster Forum Harley Forums Honda CBR250R Forum ZX10R Forum Star Raider Forum Yamaha Viking Forum
Suzuki GSXR Forum V-Rod Forums Honda Shadow Forum Kawasaki Motorcycle Forum Star Warrior Forum KTM Duke 390 Forum
SV650 Forum BMW S1000RR Forum Honda Fury Forum Kawasaki Versys Forum Drag Racing Forum Ducati 899 Panigale Forum
Suzuki V-Strom BMW K1600 Triumph Forum Victory Forums Sportbikes BMW NineT Forum
Volusia Forum BMW F800 Forum Triumph 675 Forum MV Agusta Forum HD Street Forum Suzuki GW250 Forum
Yamaha Motorcycles Victory Gunner Forum Honda Vultus Forum