|
125r top enf rebuild
- need some help
started by rayrevo
|
|
|
|
April 24th 2011 at 1:10 AM
|
|
| |
|
rayrevo
Starting Member
|
7 Posts
Group: Members
Member Since: February 17th 2009
Current Dirtbike: 1999 honda cr 125r
|
|
|
|
| |
ok first of how do i know what bore i need ? just measure it with a micrometer ? what about the cylinder just inspect it for wear ?? anything else ?
|
|
 |
|
|
|
April 24th 2011 at 8:21 AM
|
|
| |
|
MX86
What's this button do?
|
757 Posts 
Group: Moderators
Member Since: June 5th 2008
Location: Nashwauk, MN, USA
Current Dirtbike: 2006 Yamaha yz250
Race Number: 86
Sponsors: X-Brand, Gravity Worx
|
|
|
|
| |
The easiest thing would be to take the cylinder and replacement piston to a shop that rebuilds motors and ask someone to mic the bore for you to measure out of round and piston clearance.
Living Life 1 berm at a time.
|
|
|
|
|
|
April 24th 2011 at 8:57 AM
|
|
| |
|
Dekk
Above Average Member
|
665 Posts 
Group: Members
Member Since: June 18th 2008
Location: Hawarden, Iowa, USA
Current Dirtbike: Kawasaki KX250F
Race Number: 25
|
|
|
|
| |
Thats a good idea mx cause it would really suck to misread the measurement if you were to do it yourself.
Check out this video, should help with the rebuild process
http://www.dirtbikefanatics.com/article/...splay.aspx
|
|
|
|
|
|
April 24th 2011 at 12:46 PM
|
|
| |
|
|
rayrevo
Starting Member
|
7 Posts
Group: Members
Member Since: February 17th 2009
Current Dirtbike: 1999 honda cr 125r
|
|
|
|
| |
well i did it myself and got 54mm and looking at the pistons available it looks like that is the smallest and i believe this is this bike first top end , thus never being bored out. anyone have the torque spec for this motor?
|
|
|
|
|
|
April 24th 2011 at 1:51 PM
|
|
| |
|
|
MX86
What's this button do?
|
757 Posts
Group: Moderators
Member Since: June 5th 2008
Location: Nashwauk, MN, USA
Current Dirtbike: 2006 Yamaha yz250
Race Number: 86
Sponsors: X-Brand, Gravity Worx
|
|
|
|
| |
99 should be a nicasil lined cylinder... no boring, just re-plating...
Living Life 1 berm at a time.
|
|
|
|
|
|
April 24th 2011 at 9:04 PM
[ Modified April 24th 2011 at 9:05 PM
]
|
|
| |
|
PolarisPredatorTLD500
When in doubt, throttle it out!
|
91 Posts 
Group: Members
Member Since: August 12th 2010
Current Dirtbike: YZ
Race Number: 1
|
|
|
|
| |
You should be able to find the specific measurements through a trusted source (some manuals, etc.). After this have someone you know that is really good at this stuff or the shop with a professional mechanic to verify the measurements.Also, you should be able to find machine specific fit pistons and top ends. Not just random sizes you have to search through to find the one you need!?!?
|
|
|
|
|
|
April 25th 2011 at 12:06 AM
|
|
| |
|
|
MX86
What's this button do?
|
757 Posts
Group: Moderators
Member Since: June 5th 2008
Location: Nashwauk, MN, USA
Current Dirtbike: 2006 Yamaha yz250
Race Number: 86
Sponsors: X-Brand, Gravity Worx
|
|
|
|
| |
What he said ^^ Wiseco makes a wide variant of piston sizes for over bored as well as expanded cylinders, so measurements are crucial! not to mention proper clearance for when the piston expands....
Living Life 1 berm at a time.
|
|
|
|
|
|
May 17th 2011 at 10:46 PM
|
|
| |
|
MX4life
lovin' the 2 stroke
|
139 Posts 
Group: Members
Member Since: June 18th 2008
Location: Oshawa, Ontario, Canada
Current Dirtbike: 02 CR250/86 XR100
|
|
|
|
| |
The bore of the cylinder should be 54 mm
The cylinder head and base nuts should be tightened to 20 ft-lbs
If you need anything els let me know, the manual i have for my bike covers 1998-2002
2002 Honda CR250R
1986 Honda XR100R
2002 Honda CR125R(SOLD)
|
|
|
|
|
1 user(s) are reading this topic (0 Members and
1 Guests)
