cg125 big end bearing

hondacg125man · 02-08-2010, 06:23 PM

evening guys how do i go about puting a new big end bearing on my 1993 cg125

ps is £18 a good price for one of these

Bogof · 02-08-2010, 06:30 PM

Quote:

Originally Posted by hondacg125man

evening guys how do i go about puting a new big end bearing on my 1993 cg125

ps is £18 a good price for one of these

It's a fairly major job, and will almost certainly require more parts to complete than just the big-end bearing. Basically it'll go roughly like this...

Buy Haynes manual.
Buy gasket set.
Engine out.
Split crankcase.
Fit new big-end bearing.
Rebuild crankcase fitting new gaskets.
Refit engine in frame.
Swear lots when it won't start.
Swear lots more when you find the fault hasn't been cured after all.

Out of interest, why do you think it needs a new big-end bearing?

hondacg125man · 02-08-2010, 07:02 PM

firstly thanks a lot mate for replying
long story short,
got haynes manual
got a complete gasket set allready
rebuilt engine still got it apart rebored and honed

i know its the big end bearing because there is so much play in it you could move it from lands end to john o grots and when i spray with wd40 shards of metal come out which suggests roller bearings have fragmented

Bogof · 02-08-2010, 07:29 PM

Quote:

Originally Posted by hondacg125man

firstly thanks a lot mate for replying
long story short,
got haynes manual
got a complete gasket set allready
rebuilt engine still got it apart rebored and honed

i know its the big end bearing because there is so much play in it you could move it from lands end to john o grots and when i spray with wd40 shards of metal come out which suggests roller bearings have fragmented

If Mr Haynes doesnt tell you how to do it, have you had a look at somewhere like Wemotot that would have an exploded parts diagram, that should give you a clue as to how to dismantle?

Or am I misunderstanding the problem?

hondacg125man · 02-08-2010, 07:31 PM

no mate youve sussed it out pretty well!

hammerong · 02-08-2010, 07:33 PM

Sounds like the engine is so fucked I'd just buy a new one if I were you.

hondacg125man · 02-08-2010, 07:52 PM

Too Late Bought All Of The Parts Now LUS THERES A BET ON WITH A MATE THAT I CAN GET IT RUNNING BY END ON MARCH

devilsdipstick · 02-08-2010, 11:42 PM

I've never had a cg125 in bits, so I don't know, but, don't you have to separate the flywheels and therefore need to true them when you put it back together?

hondacg125man · 02-09-2010, 07:21 AM

yep gotta find someone with a lathe anda dial indicator my grandad said. hes prety good like that but he was a forklift mechanic 55 years

skodaphil · 02-09-2010, 08:27 PM

it'll be a pressed fit crank, so you'll need it split, fit new bearing/conrod then pressed back together.

02-08-2010, 06:23 PM	#1 (permalink)
hondacg125man Member Join Date: Feb 2010 Posts: 82	cg125 big end bearing evening guys how do i go about puting a new big end bearing on my 1993 cg125 ps is £18 a good price for one of these

02-08-2010, 07:02 PM	#3 (permalink)
hondacg125man Member Join Date: Feb 2010 Posts: 82	Re: cg125 big end bearing firstly thanks a lot mate for replying long story short, got haynes manual got a complete gasket set allready rebuilt engine still got it apart rebored and honed i know its the big end bearing because there is so much play in it you could move it from lands end to john o grots and when i spray with wd40 shards of metal come out which suggests roller bearings have fragmented

02-08-2010, 07:31 PM	#5 (permalink)
hondacg125man Member Join Date: Feb 2010 Posts: 82	Re: cg125 big end bearing no mate youve sussed it out pretty well!

02-08-2010, 07:33 PM	#6 (permalink)
hammerong Senior Member Join Date: Nov 2008 Location: Newbury Berks Posts: 2,822	Re: cg125 big end bearing Sounds like the engine is so fucked I'd just buy a new one if I were you. __________________ The views/opinions expressed in this post are my own and do not reflect the views of The Biker Forum, its management, and/or owners. Should you find yourself offended please immediately un-read the above post. If you choose to continue reading you do so at your own risk and Ollyc and Co. do not accept liability for any economic loss, damage to property or death and personal injury arising from the reading of above post.

02-08-2010, 07:52 PM	#7 (permalink)
hondacg125man Member Join Date: Feb 2010 Posts: 82	Re: cg125 big end bearing Too Late Bought All Of The Parts Now LUS THERES A BET ON WITH A MATE THAT I CAN GET IT RUNNING BY END ON MARCH Last edited by hondacg125man; 02-08-2010 at 08:25 PM.

02-08-2010, 11:42 PM	#8 (permalink)
devilsdipstick Senior Member Join Date: Nov 2008 Location: Derbyshire Posts: 534	Re: cg125 big end bearing I've never had a cg125 in bits, so I don't know, but, don't you have to separate the flywheels and therefore need to true them when you put it back together?

02-09-2010, 07:21 AM	#9 (permalink)
hondacg125man Member Join Date: Feb 2010 Posts: 82	Re: cg125 big end bearing yep gotta find someone with a lathe anda dial indicator my grandad said. hes prety good like that but he was a forklift mechanic 55 years

02-09-2010, 08:27 PM	#10 (permalink)
skodaphil Senior Member Join Date: Jul 2008 Location: wrexham Posts: 1,420	Re: cg125 big end bearing it'll be a pressed fit crank, so you'll need it split, fit new bearing/conrod then pressed back together. __________________ veritas et aequitas

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