Maintenance & Technical > KX250 / KX125

Main Bearing Repacement

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mustangfury:
 :-( I have a '93 kx 125 and I believe the right Main bearing is worn because I took the cover off the motor and can feel a little play if I move the main drive gear up and down. I have also been getting a ton of oil out the silencer and I tried leaning the jetting and that stopped a lot of it and now more and more oil is starting to come out as time goes on. I believe the seal on that side is shot too and the oil from the crank is getting sucked into the cylinder.

The left side is fine. I just checked that about a month ago.  The engine also makes a slight whiring noise when it runs that started a little while ago.  I do not have a press or a shop oven to use for replacing bearings. I can probably find someone I know who has a press to do it though. How hard are the main bearings to get in and out? Do I need to remove the motor and split the case or can I service everything from under the right cover? Is there any other way besides heating things to the boiling point or using a press to replace these bearings?

Given I can find a press or way of replacing the bearings, my question is A.) Is there anything else that might be worn that I should look for in relation to the right side bearing. B.) Can I fix this myself as a doi it yourselfer and regular sockets hammers and basic mechanic stuff or do I need any special tools for splitting or reassembling the crank? C.) How much would be a reasonable price to pay for a shop to fix it?

Your thoughts are much appreciated,

Stang

jonny500:
sound alot like you are on the right track, your mains and seals need to be replaced. you can do it your self with basic tools if you are carefull. it would be hard for me to explain how to do it with words alone on here. i am about to rebuild a kx 500 motor but it wont be for a month on so from now and could show photos on here of how its done. if that is to late for you i could probably do it using an old engine i have in my garage. how far can you get on your own i.e can you romove the head barrel clutch ignition ect
regards
john

mustangfury:
Winter is approaching and college just started so I have a lot of work getting ready to get dumped on me. I was hoping to get this knocked out asap so I am ready to go for spring next year. I don't have a garage either, so all my winter car/dirtbike/snowthrower repairs are done in the cold.

I have done top end rebuilds, had the clutch apart, and have had pretty much everything else apart on the bike except splitting the crank.  I have a clymer manual and it talks about special splitter tools and according to the manual, a press seems to be a necessity. I have some steering wheel pullers and others that may do the trick of their little kawi splitter tool. The press I will have to look around for.

Should I pull the motor out of the frame after removing the stator, clutch, barrel, etc.?

jonny500:
the best aproach is to remove as much as you can while the engine is in the frame as the frame dose a very good job of holding it still. you should be able to remove all most every thing bar actually spliting the cases. you can make a tool to split the case if you have access to drill and welder. old bearings can be knocked out carfully with a suitably size socket and hammer. new bearing in the freezer and cases in the oven and just drop them in. easy

jonny500:
a pic of the spliter from the other side. this cost me about ?2/$4 to make and i have split at least 40 cases with it. you put the ignition cover bolts with some washers through the out holes and screw them in to the ingnition cover holes on the case then wind the center bolt on to the crank center and it will pull the cases apart. it will work on just about any bike, you just put more holes in it as you see i have

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