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1999 KX125 cylinder replacement?

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65867 Phillip.hodge https://p.vitalmx.com/photos/users/65867/avatar/c50_S_N_logo_1537042126.jpg?1537041752 https://www.vitalmx.com/community/Phillip-hodge,65867/all 09/14/18 5 6

Posts: 11

Joined: 9/14/2018

Location: Atlanta, GA USA

9/27/2018 12:59 PM

I picked up a 1999 kx125 recently for a Splitfire PC build, only to find that the cylinder is totally shot.

Im having a difficult time finding a new cylinder to replace it with -

my question is - the service manual groups 99-02 kx125's, but its my (limited) knowledge that the cylinder and pistons are NOT interchangeable. Is this the case? I have found a few bikes being parted out for sale that have 2002 cylinders. Simply put, can I replace my 99 cylinder jug with a 2002 cylinder, then install a '02 piston?

Really appreciate any expertise here!

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Paul_Pitzonka

63534 Paul_Pitzonka https://p.vitalmx.com/photos/users/63534/avatar/c50_5E1DC8B2_775B_4192_932A_9241D4908AA2_1531363287.jpg?1531362996 https://www.vitalmx.com/community/Paul-Pitzonka,63534/all 05/01/18 2 22 581

Posts: 603

Joined: 5/1/2018

Location: Grand Terrace, CA USA

9/27/2018 1:04 PM

why don’t you just send the cylinder out to have it repaired and replated?

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Phillip.hodge

65867 Phillip.hodge https://p.vitalmx.com/photos/users/65867/avatar/c50_S_N_logo_1537042126.jpg?1537041752 https://www.vitalmx.com/community/Phillip-hodge,65867/all 09/14/18 5 6

Posts: 11

Joined: 9/14/2018

Location: Atlanta, GA USA

9/27/2018 2:55 PM

It looks to have already been replated, plus someone rethreaded 2 of the head studs (making oem studs not able to seal) and the other 3 are stripped bad.

I did reach out to US Chrome about it already but haven't hear back...

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Arrowangel

55425 Arrowangel https://p.vitalmx.com/photos/users/55425/avatar/c50_43016074_10160747060665580_862024241527128064_o_1547423386.jpg?1547422980 https://www.vitalmx.com/community/Arrowangel,55425/all 12/27/16 https://www.vitalmx.com/community/Arrowangel,55425/setup 12 147 2

Posts: 159

Joined: 12/27/2016

Location: CAN

9/27/2018 5:08 PM

i have a 00 cylinder on my 2002. I guess the opposite works too

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2002 KX125 (SOLD)/2001 KX250 (SOLD)
1999 KX250 (SOLD)
2016 RM-Z250(SOLD)
2018 KTM 150XC-W(current)

kb228

61852 kb228 https://p.vitalmx.com/photos/users/61852/avatar/c50_48AD01BA_8BE7_43D5_B767_B4A5D12AFA64_1538263085.jpg?1538262140 https://www.vitalmx.com/community/kb228,61852/all 01/31/18 73 5437 1

Posts: 5514

Joined: 1/31/2018

Location: Mansfield, OH USA

9/27/2018 5:44 PM

get ahold of millennium technologies. Hands down the best cylinder repair shop in the world. I dont doubt they can repair your head stud threads either. Weld it up and re-drill and tap. Any machinist should be able to handle that one.

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KDXGarage