Maintenance & Technical > KX250 / KX125

1991 KX 125

(1/2) > >>

Rowdy-Yates:
Hey all i just picked up a 1991 KX 125 for real cheap $600. I am full of questions. Anybody know of any good mods for this year? The bike does not hit the power band like i think it should? I was thinking carb rebuild and new reeds first. Then i would try piston rings when i have it apart i guess i would determine if i needed to be resleaved. Am i on the right track? I have been out of Dirt biking for about 10 years. Anybody got any other ideas on the sluggish motor? Is there any sticker kits that would some what fit my bike? Any post will help me out.

mikesmith:
125's wear out fast,and its an older bike so I would say money spent on new parts like piston rings,replating cylinder, air filter ect.,what ever worn parts that need replaced is $ well spent.As far as the power band (the air filter clean,correct spark plug,timeing, correct carb jetting,and fresh fuel),if it seems to "cut out" try a 1990 igniter and check the stator coils if you have a mitsubishi brand.They can have problems from being wet over time,also check the timeing.Air leaks can be a problem,so make sure you have none,how exactly is it running(or not running) right?.Try a RAD valve or a V-Fource if they have one for your year of bike.The frames can crack,so check for cracks and repair any,hope this helps and welcome back to riding, have fun!

John:
I agree with MikeSmith,

If I were you, I would start with changing the piston; they were out pretty quick and should be changed regularly. Buy a Wiseco piston. They are usually cheaper than the original and you will get better performance (at least I did on my 125er).

Also check and see if the KIPS valve is working properly. Easiest way is to take away the grey plastic cover (right hand side behind-ish the expansion chamber) and rew the engine. You should see the rod (going into the engine) moving in and out. You should be able to move it by hand using mild force. If it?s stuck you found one problem. There are a lot of post in this forum about the KIPS valve. The setup is more or less the same on all the KX?s.

//John

Rowdy-Yates:
I am going to break the bike down and paint it what better time to slap in a new piston and rings. Guess ill take the cylinder down to a shop and have them tell me what piston i need then ill know if it needs a new sleave. When you say wears out pretty quick. What do you mean could i get a year out of one or are we talking months? I just ordered a Clymer so ill wait to do any carb work. but i will check the KIPS valve.  BTW am i the only one here that does not have a 500??? LOL

Paul:
Wellllll.... no. This place started out to 500 specific and I've jsut expanded it to include all KX's. Even the four strokes...


--- Quote from: Rowdy-Yates ---BTW am i the only one here that does not have a 500??? LOL
--- End quote ---

Navigation

[0] Message Index

[#] Next page