Help & FAQs    Search BCF    Members    Groups    Events Calendar
Resend my activation email : Register : Log in 
BCF: Bike Chat Forums


2 stroke tight gearbox after rebuild

 Reply to topic
Bike Chat Forums Index -> The Workshop
View previous topic : View next topic  
Author Message

770
Nova Slayer



Joined: 25 Jan 2014
Karma :
PostPosted: 19:23 - 16 Jul 2015    Post subject: 2 stroke tight gearbox after rebuild Reply with quote
husqvarna 125

When I put the bottom end cases together the gearbox is very hard to turn, I can barely turn it using a lot of force. But if I loosen all the bolts I can hear this click (same click sound when I tighten bolts) And then the gearbox turns freely. I have reopened the case 4 times now already and checked for assembly-errors. I am using the same shims that already were there. What if I just throw the shims out, will that affect the bearings much?
 Back to top
View user's profile Send private message You must be logged in to rate posts

misscrabstick
Crazy Courier



Joined: 05 Jul 2013
Karma :
PostPosted: 20:07 - 16 Jul 2015    Post subject: Reply with quote
bearings probably not fully seated on the shafts coming through the cases into the primary drive, find a tube and put over the shafts against the bearings inner races and give them a smack.
 Back to top
View user's profile Send private message Send e-mail Visit poster's website You must be logged in to rate posts

Pete.
Super Spammer



Joined: 22 Aug 2006
Karma :
PostPosted: 20:10 - 16 Jul 2015    Post subject: Reply with quote
If you're sure it's assembled right give the shaft ends a good hard crack with a plastic-faced hammer.
____________________
a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy
 Back to top
View user's profile Send private message Visit poster's website You must be logged in to rate posts

770
Nova Slayer



Joined: 25 Jan 2014
Karma :
PostPosted: 20:15 - 16 Jul 2015    Post subject: Reply with quote
misscrabstick wrote:
bearings probably not fully seated on the shafts coming through the cases into the primary drive, find a tube and put over the shafts against the bearings inner races and give them a smack.


I can rotate the crank freely, I have just tried rotating the gearbox itself. I also tried without shims this time and it is still the same. Should the gearbox shaft be hard to turn in gear so long it is not connected to the crank?? It spins easily back and fourth but once I connect the case halves it is no go.. :/
 Back to top
View user's profile Send private message You must be logged in to rate posts

Accuhaler
Nitrous Nuisance



Joined: 28 Dec 2014
Karma :
PostPosted: 17:07 - 17 Jul 2015    Post subject: Reply with quote
Pete. wrote:
If you're sure it's assembled right give the shaft ends a good hard crack with a plastic-faced hammer.


Correct term would be a mallet....
 Back to top
View user's profile Send private message You must be logged in to rate posts
Vincent This post is not being displayed because the poster is banned. Unhide this post / all posts.
Vincent This post is not being displayed because the poster is banned. Unhide this post / all posts.

Taught2BCauti...
World Chat Champion



Joined: 12 Jan 2012
Karma :
PostPosted: 08:59 - 18 Jul 2015    Post subject: Reply with quote
Don't throw the shims out - try removing all of them first to see if it solves the problem. If it does, you will need to put the correct thickness of shims back in to remove end-float, as the new bearings may be slightly bigger than the old ones.

The workshop manual should tell you how to measure end-float and setup the shims - (usually involves a dial-gauge or a micrometer).
____________________
Honda Varadero XL125(V8)
www.TheFutureIsHere.eu
 Back to top
View user's profile Send private message Send e-mail You must be logged in to rate posts

Pete.
Super Spammer



Joined: 22 Aug 2006
Karma :
PostPosted: 09:42 - 18 Jul 2015    Post subject: Reply with quote
Taught2BCautious wrote:
Don't throw the shims out - try removing all of them first to see if it solves the problem. If it does, you will need to put the correct thickness of shims back in to remove end-float, as the new bearings may be slightly bigger than the old ones.

The workshop manual should tell you how to measure end-float and setup the shims - (usually involves a dial-gauge or a micrometer).


Bearings are sized in hundredths of a mm or better. Shims will be taking up machining tolerances.
____________________
a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy
 Back to top
View user's profile Send private message Visit poster's website You must be logged in to rate posts
Vincent This post is not being displayed because the poster is banned. Unhide this post / all posts.
unitynotsocri... This post is not being displayed because the poster is banned. Unhide this post / all posts.
Old Thread Alert!

The last post was made 10 years, 239 days ago. Instead of replying here, would creating a new thread be more useful?
  Display posts from previous:   
This page may contain affiliate links, which means we may earn a small commission if a visitor clicks through and makes a purchase. By clicking on an affiliate link, you accept that third-party cookies will be set.

Post new topic   Reply to topic    Bike Chat Forums Index -> The Workshop All times are GMT
Page 1 of 1

 
 You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You cannot download files in this forum

Read the Terms of Use! - Powered by phpBB © phpBB Group
 
Debug Mode: ON - Server: birks (www) - Page Generation Time: 0.08 Sec - Server Load: 0.57 - MySQL Queries: 13 - Page Size: 72.26 Kb