CBR300 JE piston inside - Honda CBR250R Forum : Honda CBR 250 Forums
User Tag List

Reply
 
LinkBack Thread Tools
post #1 of 19 Old 12-03-2012, 01:02 AM Thread Starter
Member
 
Join Date: Aug 2011
Posts: 52
Thanks: 0
Thanked 40 Times in 15 Posts
CBR300 JE piston inside

Specs:

JE piston 82mm
Custom Gasket
SPS camshaft stage 1.
porting and polishing
ultrasped highperformance ignition coil
EZ-banjing piggyback

and etc..

fewmonths back, a guy from layz motor, LAYZ-MOTOR.COM ,came to me for extreme engine modification because he feels that the bike need more power after he install bigger tire etc.
at that time, there is no boreup 300cc kit yet(kawahara boreup kit) only JE piston available for CBR250.



custom gasket

after fewmonths now. he wants me to check his engine.






no dyno available yet.
Thanks
gtitwo is offline  
Sponsored Links
Advertisement
 
post #2 of 19 Old 12-03-2012, 01:09 AM Thread Starter
Member
 
Join Date: Aug 2011
Posts: 52
Thanks: 0
Thanked 40 Times in 15 Posts
his bike: LAYZ-MOTOR.COM
gtitwo is offline  
post #3 of 19 Old 12-03-2012, 02:01 AM
Senior Member
 
loserlazer's Avatar
 
Join Date: Nov 2011
Location: Bangkok
Posts: 175
Thanks: 12
Thanked 41 Times in 12 Posts
wow. that piston does not look so good man.
especially the burned sides.
loserlazer is offline  
post #4 of 19 Old 12-03-2012, 05:56 AM Thread Starter
Member
 
Join Date: Aug 2011
Posts: 52
Thanks: 0
Thanked 40 Times in 15 Posts
Quote:
Originally Posted by loserlazer View Post
wow. that piston does not look so good man.
especially the burned sides.
i know
gtitwo is offline  
post #5 of 19 Old 12-03-2012, 03:20 PM
Member
 
Join Date: Sep 2012
Location: DFW, Texas, USA
Posts: 70
Thanks: 86
Thanked 28 Times in 15 Posts
Running too lean? Too hot for the cooling system?
Boomer1911A1 is offline  
post #6 of 19 Old 12-03-2012, 03:42 PM
Member
 
Join Date: Dec 2012
Location: Orlando, FL
Posts: 33
Thanks: 5
Thanked 7 Times in 7 Posts
I think thats just the low-friction coating on the pistons. It typically is blackish to dark gray. I've seen it before on car and scooter pistons.
stevo585 is offline  
post #7 of 19 Old 12-13-2012, 11:05 AM
Member
 
Join Date: Aug 2011
Posts: 49
Thanks: 8
Thanked 27 Times in 9 Posts
Is it possible the fuel injector flow rate is too low and running lean at higher RPM with the increased capacity? If anyone has any specifications on the injector I'd love to see them since I can't find anything. I am in the middle of tearing down my engine and anticipating putting the larger JE piston in and decking the head a bit.
msvec is offline  
post #8 of 19 Old 12-29-2012, 11:45 PM Thread Starter
Member
 
Join Date: Aug 2011
Posts: 52
Thanks: 0
Thanked 40 Times in 15 Posts
after i clean it, change the shim clearence, change the gasket to 1mm and put it back on... we got 32xxwhp with BAZZAZ fi this time. we still need to adjust at high rpm probably can reach to 33-34whp. before that we only got 30whp.
gtitwo is offline  
post #9 of 19 Old 12-29-2012, 11:51 PM Thread Starter
Member
 
Join Date: Aug 2011
Posts: 52
Thanks: 0
Thanked 40 Times in 15 Posts
Quote:
Originally Posted by msvec View Post
Is it possible the fuel injector flow rate is too low and running lean at higher RPM with the increased capacity? If anyone has any specifications on the injector I'd love to see them since I can't find anything. I am in the middle of tearing down my engine and anticipating putting the larger JE piston in and decking the head a bit.
i believe so. you need to get higher rate injector. but it is hard to get one here. i need to have my friend buy in state and send it over here.

if you guys having a problem to get a good gasket instead using stock gasket(you can see in picture), i can help you out to get one of those like mine. 1mm, 2mm thickness. shipping will be the problem. but, if you guys trust me, my cousin is coming back to seattle on mid january. i can have her send it to you and save lots of money.
gtitwo is offline  
post #10 of 19 Old 12-31-2012, 04:01 AM
Junior Member
 
Join Date: Dec 2012
Posts: 24
Thanks: 22
Thanked 1 Time in 1 Post
so do we know ? Was it worth it .....
I mean was the extra power enought to be worth it ?
Dreadnot is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Honda CBR250R Forum : Honda CBR 250 Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



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

 
For the best viewing experience please update your browser to Google Chrome