250 Rebuilding KX250

AdamRides87 · Dec 7, 2015

How do I remove the shift drum operating cam? When I go to loosen it it obviously just spins

AdamRides87 · Dec 7, 2015

Nevermind lol. Forgot it stops at 5th gear durr

2strokesteve89 · Dec 7, 2015

adamrides646:
Nevermind lol. Forgot it stops at 5th gear durr

Good catch sparky

AdamRides87 · Dec 8, 2015

Split

AdamRides87 · Dec 8, 2015

PALMER84ONE · Dec 8, 2015

adamrides646:
Nevermind lol. Forgot it stops at 5th gear durr

Hey, thats called the segment sparky.
That engine has had main bearing before, and they put them in backwards.
I hate the KX seals because you can't replace them without spliting the case. Then, you have to bake them with the case halves to drop in the frozen bearings.

But let it go.........
Let it go.......
The cold never bothered me anyway.....

AdamRides87 · Dec 8, 2015

PALMER84ONE:
Hey, thats called the segment sparky.
That engine has had main bearing before, and they put them in backwards.
I hate the KX seals because you can't replace them without spliting the case. Then, you have to bake them with the case halves to drop in the frozen bearings.

But let it go.........
Let it go.......
The cold never bothered me anyway.....

Wow. The guy before me put them in backwards. What a tard. How can you tell, by the writing

2strokesteve89 · Dec 9, 2015

PALMER84ONE:
Hey, thats called the segment sparky.
That engine has had main bearing before, and they put them in backwards.
I hate the KX seals because you can't replace them without spliting the case. Then, you have to bake them with the case halves to drop in the frozen bearings.

But let it go.........
Let it go.......
The cold never bothered me anyway.....

Or just use a shop press

PALMER84ONE · Dec 9, 2015

Yah, in my YZ manual it says to put the bearing with letters out. I really can't tell any difference but don't question the manual.

Mihylo33 · Dec 9, 2015

Those bearings are cooked. I gave my manual to m18 with my kx so I can't tell you which way these go but I think Palmer is right.

AdamRides87 · Dec 9, 2015

Mihylo33:
Those bearings are cooked. I gave my manual to m18 with my kx so I can't tell you which way these go but I think Palmer is right.

A co worker told me the lettered side has more of a flat lip so while pounding the bearing in it doesn't damage the lip. Said the other side is more rounded (non pounding side). What do you mean cooked? Baked by the motor

Mihylo33 · Dec 9, 2015

adamrides646:
A co worker told me the lettered side has more of a flat lip so while pounding the bearing in it doesn't damage the lip. Said the other side is more rounded (non pounding side). What do you mean cooked? Baked by the motor

get a manual you wiener.
Yes baked by the motor and on their way out. What ratio are you running?

AdamRides87 · Dec 9, 2015

Mihylo33:
get a manual you wiener.
Yes baked by the motor and on their way out. What ratio are you running?

I have a manual now. I was running 40:1

Mihylo33 · Dec 9, 2015

adamrides646:
I have a manual now. I was running 40:1

32:1 and jet richer. That's an oil starved bearing son. See the blueing on the inner race.

You should probably change out the big end bearing as well.

AdamRides87 · Dec 9, 2015

Mihylo33:
32:1 and jet richer. That's an oil starved bearing son. See the blueing on the inner race.

You should probably change out the big end bearing as well.

Why was it fouling plugs like a son of a bitch then? And my power valve being gummed up so bad.