Boring - Honda RC51 Forum : RC51 Motorcycle Forums
 
LinkBack Thread Tools Display Modes
post #1 of 6 (permalink) Old 10-07-2010, 01:04 AM Thread Starter
Junior Member
 
Join Date: Oct 2010
Posts: 18
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Boring

Relatively new to the motorcycle world, but I picked up a clean 2001 frame and an engine that needs work for cheap. I'm familiar with automobile engines, but I have some questions about the v-twin.

The original owner ran it on a bad water pump and it scored the cylinders and it needs to be bored out. One of my main questions is; what are the standard overbore specifications and where is the best place to find overbore pistons and rings?

I will definitely have more questions later and will need almost everything for the bike, so if anyone happens to have a parts bike sitting around I would be more than happy to take it off your hands.

Thanks
Brandyn
Brandyn is offline  
Sponsored Links
Advertisement
 
post #2 of 6 (permalink) Old 10-07-2010, 07:41 AM
Site Sponsor
 
RC51parts.com's Avatar
 
Join Date: Apr 2009
Location: NY
Posts: 332
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
2mm and JE or other aftermarket pistons. There are lots of threads out there about engine rebuilds with good gains for a relatively stock motor.
RC51parts.com is offline  
post #3 of 6 (permalink) Old 10-07-2010, 02:40 PM
Moderator
 
SubSailor's Avatar
 
Join Date: Oct 2008
Location: Sarasota, FL
Posts: 6,461
Mentioned: 24 Post(s)
Quoted: 88 Post(s)
The two OEM overbore piston and ring sizes are .25mm and .050mm overbore.
The cylinders must be bored for piston to cylinder clearance of .015 - .055mm.

Anything beyond .50mm overbore and the cylinders will either need to be replaced.
It may be possible to send them Millenium Technologies and have them re-plated if not too badly damaged.
SubSailor is offline  
 
post #4 of 6 (permalink) Old 10-07-2010, 03:03 PM Thread Starter
Junior Member
 
Join Date: Oct 2010
Posts: 18
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by SubSailor View Post
The two OEM overbore piston and ring sizes are .25mm and .050mm overbore.
The cylinders must be bored for piston to cylinder clearance of .015 - .055mm.

Anything beyond .50mm overbore and the cylinders will either need to be replaced.
It may be possible to send them Millenium Technologies and have them re-plated if not too badly damaged.
So I could use the standard bore pistons with oversize rings as long as it has the correct clearance?

I haven't talked to my "local" parts supplier yet but I'm having a little difficulty finding oversize pistons.
Brandyn is offline  
post #5 of 6 (permalink) Old 10-07-2010, 03:09 PM
Moderator
 
SubSailor's Avatar
 
Join Date: Oct 2008
Location: Sarasota, FL
Posts: 6,461
Mentioned: 24 Post(s)
Quoted: 88 Post(s)
No. when you bore the cylinders to the next overbore size, the piston and rings must match.
Both pistons and rings are available in .25mm and .50mm sizes.
The cylinders must be bored slightly larger to allow for the specified piston/ring to cylinder clearance.
SubSailor is offline  
post #6 of 6 (permalink) Old 10-07-2010, 04:25 PM Thread Starter
Junior Member
 
Join Date: Oct 2010
Posts: 18
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Ok, you had me confused for a second there.
Brandyn is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Honda RC51 Forum : RC51 Motorcycle 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










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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