2003 kawasaki KX 125 Logo

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Posted on Jan 18, 2011
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I have a 2004 kawasaki kx 125 the top end needs to be rebuilt it has been rebuilt one time already so what parts would i need to get is it hard to do or what

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  • Expert 185 Answers
  • Posted on Jun 26, 2011
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Joined: May 20, 2011
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Piston kit, wrist pin bearing, top end gasket kit and a honing tool to clean your cylinder is about it I would probably buy new air filter and spark plug if I was doing it, but not essential ?

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0helpful
2answers

I have a 1987 kx 125 just put topend gasket set in with piston and rings and coolent is getting in the case bottom end anyone know why plz help me

It sounds as if you have rebuilt the engine without torqueing the head bolts. Although, it could be that the cylinder base gasket has been torn during the rebuild. Try to re-tighten the head bolts to the correct settings first. Good luck.
0helpful
1answer

STUCK PISTON ON 65KX KAW

sounds like a siezure, tear down the top end and inspect it!

hopefully its just the piston and not the crankshaft.

remove the piston and see if the rod has nice smooth movement, and no up and down movement on the big-end bearing

Now, you need to find out what caused the siezure, so you dont sieze it again after its rebuilt
1helpful
1answer

Need gas-oil ratio on 2004 kawasaki kx 125 2 stroke bike

32:1--40:1 any less than 40:1 And you take risk of damaging engine(crank and top end),Any more than 32:1 and it will smoke real bad and foul spark plugs alot.....
0helpful
1answer

What is the Kawasaki kx 125 compression i did test tested 135 with cold motor is this what it shuld be i get real bad bog at low rpm

anything over 120 on compression test is ok. anything under 120 and its time for top end. and for bog you might try cleaning carb.
0helpful
1answer

Kx 125 down on power

is it smoking a lot
are you running on ratio off 32:1
did you install the rings correctly ????
0helpful
1answer

My kx 125 1998will not start..i just bought the bike yesterday an the guy said it had a crankshaft seizure he rebuilt the top end suposively but he said he didnt have the right tool to replace the...

Just find yourself another motor, or send yours off to be rebuilt. Depending upon where you live will be how hard it is to find someone to rebuild the crank. If you can buy the whole crank assembly with the rod already on it, you may be able to get by with it.
7helpful
3answers

Top speed

no you **** going bigger in the back is more accel, smaller is more top end. a 48-46 would put you somewhere between 80-100 mph depending on the engine but result is **** low end. If your kx is 6 spd you would benefit from going up a tooth or 2 for lowend because it has topend already.
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