Go Back   DIY Go Kart Forum > Building Plans And Advice > Photo Gallery & Project Log

Notices

Closed Thread
 
Thread Tools Display Modes
  #1  
Old 07-14-2012, 09:49 PM
Bluethunder3320's Avatar
Bluethunder3320 Bluethunder3320 is offline
Senior Member
 
Join Date: Sep 2010
Posts: 5,677
Thanks: 516
Thanked 188 Times in 168 Posts
Default YZ125 project

picked this up today. has a siesed bottom end.





here is how i think it went..

it had carb problems, the main jet was partly clogged and it was running lean (hot) OR they ran straight gas

this wore out the rod bearings and killed the top end

the last owner bought it, cleaned the carb, and rebuilt the top end

it ran for a while, then the rod bearings got so worn out that it started rubbing on the crank. metal shavings went up into the cylinder and left a ton of pitting on the piston&head

the bottom end finally got so worn out that the rod got completely stuck against the crank

and here we are now









cylinder doesnt look too bad



my friend has tools to take the clutch off and flywheel and stuff. i just need to save up for a top and bottom end rebuild now
  #2  
Old 07-14-2012, 10:01 PM
Bluethunder3320's Avatar
Bluethunder3320 Bluethunder3320 is offline
Senior Member
 
Join Date: Sep 2010
Posts: 5,677
Thanks: 516
Thanked 188 Times in 168 Posts
Default

there we go, $300. that would make it a $300 bike with a completely rebuilt engine

http://www.motosport.com/dirtbike/19...BOTTOM-END-KIT
  #3  
Old 07-14-2012, 11:39 PM
OzFab's Avatar
OzFab OzFab is offline
Senior Member
 
Join Date: Nov 2011
Location: Warwick Qld, Australia
Posts: 15,619
Thanks: 1,135
Thanked 3,399 Times in 2,676 Posts
Default

That piston crown & head have definitely taken a beating.

How much would a good used engine cost? You also have to think about the condition of the bore; if it's too pitted, you may need to bore or even resleeve it, which may not be cost effective.
__________________
2013 Build-off Winner - http://www.diygokarts.com/vb/showthread.php?t=21076
  #4  
Old 07-15-2012, 12:11 AM
bighead's Avatar
bighead bighead is offline
Senior Member
 
Join Date: Mar 2010
Location: Pacific Northwest USA
Posts: 4,022
Thanks: 158
Thanked 312 Times in 278 Posts
Default

Is the head going to need any machine work? Will the gaskets in the kit work if so?
__________________
Attention Criminals!! This is a defense free crime zone. All law-abiding citizens have been disarmed for your convenience.
  #5  
Old 07-15-2012, 12:28 AM
bighead's Avatar
bighead bighead is offline
Senior Member
 
Join Date: Mar 2010
Location: Pacific Northwest USA
Posts: 4,022
Thanks: 158
Thanked 312 Times in 278 Posts
Default

http://nwct.craigslist.org/mcy/3073536531.html

http://westernmass.craigslist.org/mcy/3073545255.html

http://hudsonvalley.craigslist.org/mcy/3040872775.html

http://newlondon.craigslist.org/mcy/3088517378.html

http://newlondon.craigslist.org/mcy/3049235385.html

looks good
http://worcester.craigslist.org/bik/3072653450.html

Not sure of the years but hey!
__________________
__________________
Attention Criminals!! This is a defense free crime zone. All law-abiding citizens have been disarmed for your convenience.
  #6  
Old 07-15-2012, 11:11 AM
Bluethunder3320's Avatar
Bluethunder3320 Bluethunder3320 is offline
Senior Member
 
Join Date: Sep 2010
Posts: 5,677
Thanks: 516
Thanked 188 Times in 168 Posts
Default

i think i will need a head, piston, crankshaft&rod, gasket kit

im trying to figure out if any other year engines will fit. it seems very hard to find a 1992 bottom end rebuild...

if i had spent money on this i would be worried
  #7  
Old 07-15-2012, 11:22 AM
B.M.800's Avatar
B.M.800 B.M.800 is offline
TheBeal.
 
Join Date: Apr 2010
Location: Central PA
Posts: 2,372
Thanks: 19
Thanked 168 Times in 145 Posts
Default

Looks like fun. I like the blue...

I may be able to get a couple bikes of some sort, been in a shed for years. Not sure what they are...
__________________
Dean done this here thing to this here thing, y'all
  #8  
Old 07-15-2012, 02:30 PM
r97's Avatar
r97 r97 is offline
Measure twice cut once
 
Join Date: Jul 2010
Location: Massachusetts, USA
Posts: 3,793
Thanks: 39
Thanked 250 Times in 229 Posts
Default

I know there is a website that can tell you what other year/model motorcycles share a certain part from your bike. Unfortunately I can't find it... but you seem to be doing fine finding parts anyway. If I could find a rebuild kit like that for my motorcycle I would probably buy it, new pistons, rings, con-rods, and many other parts for my bike are made of solid unobtanium

What is up with the cylinder? It looks like someone went through it with a hone, but only once. Good luck with your project!
  #9  
Old 07-15-2012, 02:43 PM
brandongeiger2's Avatar
brandongeiger2 brandongeiger2 is offline
Senior Member
 
Join Date: Jul 2011
Location: Valrico Florida
Posts: 584
Thanks: 37
Thanked 32 Times in 28 Posts
Default

Looks a whole lot like a 95 except for the rear fender i wouldn't machine the jug head though id get a good used one try to keep the engine stock or use good aftermarket parts it makes everything easier
__________________
Dirt Devil Build http://www.diygokarts.com/vb/showthread.php?t=15085
"YOLO"-Carpe Diem for the uneducated
  #10  
Old 07-15-2012, 03:33 PM
Bluethunder3320's Avatar
Bluethunder3320 Bluethunder3320 is offline
Senior Member
 
Join Date: Sep 2010
Posts: 5,677
Thanks: 516
Thanked 188 Times in 168 Posts
Default

i think the cylinder is new.

the front fender is a newer one, i think he said 2003? the rear fender is stock. used to be white and someone painted it

pic with the fenders mocked up

  #11  
Old 07-15-2012, 03:40 PM
Ghanem's Avatar
Ghanem Ghanem is offline
Senior Member
 
Join Date: Jan 2011
Location: United Arab Emirates
Posts: 194
Thanks: 12
Thanked 4 Times in 4 Posts
Default

hey Blue i was wondering how many bearings are in a 125cc quad engine?
  #12  
Old 07-15-2012, 04:02 PM
Bluethunder3320's Avatar
Bluethunder3320 Bluethunder3320 is offline
Senior Member
 
Join Date: Sep 2010
Posts: 5,677
Thanks: 516
Thanked 188 Times in 168 Posts
Default

a lot. needle bearings on both sides of the rod, ball bearings on the crank, and all of the transmission, kick starter, shifter, all ride on ball bearings

you dont see any bushings like a small engine

a 4 stroke has more moving parts so they have more bearings than a 2 stroke...
The Following User Says Thank You to Bluethunder3320 For This Useful Post:
Ghanem (07-15-2012)
  #13  
Old 07-15-2012, 04:32 PM
brandongeiger2's Avatar
brandongeiger2 brandongeiger2 is offline
Senior Member
 
Join Date: Jul 2011
Location: Valrico Florida
Posts: 584
Thanks: 37
Thanked 32 Times in 28 Posts
Default

Those are shrouds and number plates not fenders
but anyway is there a decal on the steering tube with the year on it? I'm interested in this also what are you planning on doing with it just getting it running?
__________________
Dirt Devil Build http://www.diygokarts.com/vb/showthread.php?t=15085
"YOLO"-Carpe Diem for the uneducated
  #14  
Old 07-15-2012, 04:53 PM
Bluethunder3320's Avatar
Bluethunder3320 Bluethunder3320 is offline
Senior Member
 
Join Date: Sep 2010
Posts: 5,677
Thanks: 516
Thanked 188 Times in 168 Posts
Default

Quote:
Originally Posted by brandongeiger2 View Post
Those are shrouds and number plates not fenders
but anyway is there a decal on the steering tube with the year on it? I'm interested in this also what are you planning on doing with it just getting it running?
i plan on getting it running and ride it alot.

theres a vin number on the steering tube i didnt see a year at a first glance i will look again

fenders, shrouds, number plates, whats the difference? lol
  #15  
Old 07-15-2012, 04:56 PM
brandongeiger2's Avatar
brandongeiger2 brandongeiger2 is offline
Senior Member
 
Join Date: Jul 2011
Location: Valrico Florida
Posts: 584
Thanks: 37
Thanked 32 Times in 28 Posts
Default

Haha just thought id throw that in there if you need shrouds and ask for fenders at a shop guess what you'll get? but yz's are the best id trade my bike in a second for one.
And you would have seen the year if the decal was there most bikes have them but the vin will do just as good with a bit of research
__________________
Dirt Devil Build http://www.diygokarts.com/vb/showthread.php?t=15085
"YOLO"-Carpe Diem for the uneducated
  #16  
Old 07-15-2012, 05:01 PM
Bluethunder3320's Avatar
Bluethunder3320 Bluethunder3320 is offline
Senior Member
 
Join Date: Sep 2010
Posts: 5,677
Thanks: 516
Thanked 188 Times in 168 Posts
Default

also, someone seems to have painted the frame. the paint is scratched away where the VIN is.

gonna go take a picture now
  #17  
Old 07-15-2012, 06:02 PM
Bluethunder3320's Avatar
Bluethunder3320 Bluethunder3320 is offline
Senior Member
 
Join Date: Sep 2010
Posts: 5,677
Thanks: 516
Thanked 188 Times in 168 Posts
Default







JYA4DDW04NA008401
  #18  
Old 07-15-2012, 07:22 PM
Jimbo86's Avatar
Jimbo86 Jimbo86 is offline
Senior Member
 
Join Date: Jul 2011
Location: Northern Virginia
Posts: 102
Thanks: 10
Thanked 6 Times in 6 Posts
Default

You put the vin# in incorrectly.


JYA4DDW04NA008401 - what you said it was
JYA4DDW94NA008401 - what you put in
__________________
Speed isn't everything, handling is improtant too!
Current Project : Manco Interceptor DONE! Update SOON!!!
  #19  
Old 07-15-2012, 08:30 PM
brandongeiger2's Avatar
brandongeiger2 brandongeiger2 is offline
Senior Member
 
Join Date: Jul 2011
Location: Valrico Florida
Posts: 584
Thanks: 37
Thanked 32 Times in 28 Posts
Default

Nice im suprised i was within +-5 years hahabut normally there's a decal that looks like this........ its a phone picture sorry but its not that hard to see
Attached Images
File Type: jpg 0715122220.jpg (43.7 KB, 10 views)
__________________
Dirt Devil Build http://www.diygokarts.com/vb/showthread.php?t=15085
"YOLO"-Carpe Diem for the uneducated
  #20  
Old 07-15-2012, 09:30 PM
Bluethunder3320's Avatar
Bluethunder3320 Bluethunder3320 is offline
Senior Member
 
Join Date: Sep 2010
Posts: 5,677
Thanks: 516
Thanked 188 Times in 168 Posts
Default

yeah my friends xr100 had a stamp like that

jimbo, oops, i thought it was a 9...

EDIT: doesnt work either way
The Following User Says Thank You to Bluethunder3320 For This Useful Post:
MuddInRI (08-15-2012)
Closed Thread

Thread Tools
Display Modes

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



All times are GMT -6. The time now is 04:24 PM.