Maintenance & Technical > KX250 / KX125
2004 KX 125 Rebuild
DP3601:
Good news! A rep from Athena called me to check on how things were coming out with the top end kit that I had asked questions about. He told me that the cylinder for my 2004 KX 125 should only be using a flat top piston because of the clearance for the head. When I pulled it apart the previous owner had put in a domed piston and used two base gaskets to try and make the clearance work out. When I pulled the piston it had a ring around the top that was indented into the piston. He suggested that it was possible that when I got it to the higher rpm it was hitting the head.
Needless to say I put it back together to try it out with the correct piston before tearing the bottom end completely apart. There is no vibration at all in the higher RPM's like before. I rode it for two days pretty hard and it runs like really good. I will eventually tear the bottom end down and replace bearings and seals since it has most likely never been done before.
I still have some more rebuilding to continue to get it better in other areas but so far so good. I will post some pics this week of progress.
Thanks again for all the info and suggestions from everyone that did.
Foxx4Beaver:
wow....quite a turn of events...luckily that top end didn't grenade itself and really cause a mess.
have to remember those symptoms next time I or someone else comes up with a similar issue.
Roost on!
DP3601:
Finally got some time to post a few pics of the KX 125 I have been working on.
This is where I started, picking up a KX125 and KLX 110 for $1550 after talking to the seller.
DP3601:
Making the trip home finally after a 4 1/2 hour drive south!
Not a bad bike to start with...
The forks were in bad shape, lower legs were pitted like they had been rode in gravel with out the fork guards and uppers were flaking off, rear shock was completely blown.
I took the suspension to Enzo to be rebuild and they said the forks would never hold a seal with the pits so thanks to Ebay I found this whole front end for half of what one lower tube would cost.
Suspension Complete!
Foxx4Beaver:
that 125 looks dam near new...
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