Coming Soon
Home > Forum


« previous next »
Pages: 1 [2]   Go Down

Author Topic: How do you check crank bearings?  (Read 6706 times)

0 Members and 1 Guest are viewing this topic.

Offline MetalMike1982

  • Posts: 0
    • View Profile
How do you check crank bearings?
« Reply #15 on: May 17, 2012, 12:46:11 AM »
 This thread got me all worked so I went and pulled my ign cover and sure enought there is the smallest amount of play as far as up and down movement goes . I'm not riding it until its fixed .

How much do you guys think the labor costs would be to have a shop change them for me if I brought them the motor minus the top end ?
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
Logged

Offline scotty dog

  • Professional
  • *****
  • Posts: 599
  • because golf courses should be motocross tracks!
    • View Profile
How do you check crank bearings?
« Reply #16 on: May 17, 2012, 03:12:04 AM »
I've never had a shop do a bottom end but i put a 2002 CR 250 engine together last Friday wich took me about 3 hours, maybe thats slow, i dunno but i was doing lots of checking and double checking so i didnt stuff it up and have to do it all again. I would say for someone who does it all the time they could have a bottom end stripped, cleaned and reassembled in 4 to 5 hours??? that is my guesstimation..   :D


no doubt someone will shoot me down  :<img src=" title="Roll Eyes" class="smiley">
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
Logged
F**K THE WHALES......................SAVE THE 2 STROKE!!!!

The hardest part about riding a 4 stroke is telling your parents your Gay!!

05 CR 250

Offline cnrcpla

  • Novice
  • *
  • Posts: 0
    • View Profile
How do you check crank bearings?
« Reply #17 on: May 17, 2012, 05:49:34 AM »
If you are just doing the bearings like I will be soon, then let me know how they do. Do you even have to split cases to do the crank bearings?
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
Logged

Offline scotty dog

  • Professional
  • *****
  • Posts: 599
  • because golf courses should be motocross tracks!
    • View Profile
How do you check crank bearings?
« Reply #18 on: May 17, 2012, 12:40:19 PM »
Yep ya do, and whole ya there ya might aswell do all the bearings n seals including ya big end
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
Logged
F**K THE WHALES......................SAVE THE 2 STROKE!!!!

The hardest part about riding a 4 stroke is telling your parents your Gay!!

05 CR 250

Offline cnrcpla

  • Novice
  • *
  • Posts: 0
    • View Profile
How do you check crank bearings?
« Reply #19 on: May 17, 2012, 01:17:35 PM »
Oh yeah. If I am splitting cases, I will do the whole 9 yards. Con rod kit, bearings, seals, everything that needs to be done. But, I am thinking that with the help of you guys here on TSM, I should be able to split the cases my self and do this. I can pick up a few special tools I will need at the shop and bring them home when I decide to do this.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
Logged

Offline scotty dog

  • Professional
  • *****
  • Posts: 599
  • because golf courses should be motocross tracks!
    • View Profile
How do you check crank bearings?
« Reply #20 on: May 17, 2012, 01:34:39 PM »
Youll have plenty of help from all here thats for sure
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
Logged
F**K THE WHALES......................SAVE THE 2 STROKE!!!!

The hardest part about riding a 4 stroke is telling your parents your Gay!!

05 CR 250

Offline cnrcpla

  • Novice
  • *
  • Posts: 0
    • View Profile
How do you check crank bearings?
« Reply #21 on: May 17, 2012, 01:42:09 PM »
Oh yeah, I have come to rely on TSM more than the service people at the MX dealership where I live. You guys have helped me through an entire bike rebuild and re paint, all kinds of engine work, and have put up with some of my stupider posts  ;D

But, some good news. I checked the stator side crank bearings. No movement  ;D However, I will be keeping my eye on it every now and then, it didn't seem snug to me, but that just could be my lack of experience with crank bearings kicking in hahaha.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
Logged

Offline MetalMike1982

  • Posts: 0
    • View Profile
How do you check crank bearings?
« Reply #22 on: May 17, 2012, 04:31:07 PM »
 Talked to my local shop that my friend Charlie owns and they said $150 for labour to replace it .

I'm getting an entire wiseco crank kit for $188 so $150 + $188 is $338 and she'll be back to new .  Did I say how much I love 2 strokes?  :P :P
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
Logged

Offline arnego2

  • Posts: 0
    • View Profile
How do you check crank bearings?
« Reply #23 on: May 17, 2012, 07:12:46 PM »
Do it yourself, it is not as difficult, you need a flywheel puller and case splitter.
Other than that a press would be nice. If not find someone who has or get dry ice.

With dry ice you cool down the roller ball bearings and with an oven you heat the case up to 150 degrees.
Bearing should just drop in.

The reason to do it yourself is that along the years you have to do it about once a year if you ride each weekend.
More often if you ride 4 to 6 hours a week.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
Logged

Offline MetalMike1982

  • Posts: 0
    • View Profile
How do you check crank bearings?
« Reply #24 on: May 17, 2012, 07:21:37 PM »
Quote from: arnego2 on May 18, 2012, 02:12:46 AM
Do it yourself, it is not as difficult, you need a flywheel puller and case splitter.
Other than that a press would be nice. If not find someone who has or get dry ice.

With dry ice you cool down the roller ball bearings and with an oven you heat the case up to 150 degrees.
Bearing should just drop in.

The reason to do it yourself is that along the years you have to do it about once a year if you ride each weekend.
More often if you ride 4 to 6 hours a week.


 I plan on getting the required tools very soon to be able to do it myself but I'm gonna let the shop do it this time and shadow the tech thats doing it so I know what to do next time .   The transmissin is what has me a little iffy . i dont know that If I were to take it apart and things fall out of place that I would be able to put it all back together the right way .  The bike probably gets 25 hrs or less a year put on it .


I've been brainstorming a little now that I'm getting the bottom end freshened up about the Athena 144 kit but its just thoughts right now .
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
Logged

Offline arnego2

  • Posts: 0
    • View Profile
How do you check crank bearings?
« Reply #25 on: May 17, 2012, 10:11:31 PM »
It is quite easy, the tranny, stay in place when you take off the flywheel site first. I do it with my press and don't lose the srew with holds the gear cam shift. I did make my press small so I can do it with the gear still into the case. But to do it with the tranny out is not so back neither.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
Logged

Offline ford832

  • Professional
  • *****
  • Posts: 1532
  • I PITY THE FOOL THAT RIDES A FOURSTROKE
    • View Profile
How do you check crank bearings?
« Reply #26 on: May 22, 2012, 12:45:43 AM »
The best,most accurate way I've found to check them is before you take anything apart.Put a dial gauge in the spark plug hole and rotate the engine around slowly until you hit TDC.The reading doesn't matter but if the gauge hesitates before starting back down,you've got play.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
Logged
I'd rather a full bottle in front of me than a full frontal lobotomy.

Offline SachsGS

  • Professional
  • *****
  • Posts: 1235
    • View Profile
How do you check crank bearings?
« Reply #27 on: May 22, 2012, 03:21:43 PM »
Yamaha 2Ts have very few shims and are very easy to work on.Pop off your stator and primary drive gears,leave the clutch/kickstart/shift mechanism in place,split the cases and leave entire tranny assembly in case halve,wrap tape around trans/shift drum assy so it does not move and service crank assy.. ;D
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
Logged
Pages: 1 [2]   Go Up
« previous next »