Maintenance & Technical > KX250 / KX125

01 KX125 in need of a good engine builder!

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hotrodhalfton:
I just purchased an 01 kx125 in nice shape it ran ok needed some going over but the same day i bought it my son put my 50:1 chain saw gas in it and ripped it down the road as tight as it would go while i was out for awile and it siezed right up locking the rear tire up goin down the road then unsiezed in a few min well when he told me i wasnt to happy.it now has ZERO compression, I havent pulled the top end off yet but im assuming the pistons scorched and the plating is toast. I would like to have a builder in mind when i tear into it. Even if for some wierd reason the platings ok i dont wanna just throw a piston& rings in it. So ontop of the top end plating and also maby some port work I also might need to have the lower end freshend up. i just dont wanna spend a fourtune but i dont wanna discount hack spliting the cases. I live in maine so the closer the better but I'll ship it out if need be. Any recommendations on a shop? Thanks

DoldGuy:
Welcome to the forum halfton. Do a leak down test BEFORE you remove the top end, this will give very needed information to you or the builder you select.

DoldGuy

reklessj:

--- Quote from: hotrodhalfton on October 23, 2015, 09:20:22 AM ---I just purchased an 01 kx125 in nice shape it ran ok needed some going over but the same day i bought it my son put my 50:1 chain saw gas in it and ripped it down the road as tight as it would go while i was out for awile and it siezed right up locking the rear tire up goin down the road then unsiezed in a few min well when he told me i wasnt to happy.it now has ZERO compression, I havent pulled the top end off yet but im assuming the pistons scorched and the plating is toast. I would like to have a builder in mind when i tear into it. Even if for some wierd reason the platings ok i dont wanna just throw a piston& rings in it. So ontop of the top end plating and also maby some port work I also might need to have the lower end freshend up. i just dont wanna spend a fourtune but i dont wanna discount hack spliting the cases. I live in maine so the closer the better but I'll ship it out if need be. Any recommendations on a shop? Thanks

--- End quote ---
I had my K5 totally rebuilt by   (ex factory  Kawasaki mechanic)  not the cheapest but he knows his $h¡+ . Extremely happy!!
There are lots of members that are more than capable just don't know if they are taking on projects

hotrodhalfton:
Im not shure what the last one ment but if i understood it correctly i am quite comfortable doing top ends on bikes ive done a few atvs,mx bikes and my harleys plus ive built (not just assembled)several hot chevy street/strip motors, porting heads,custom parts,stroker mods the works,its gonna need plating and i dont wanna tear it apart untill i at least have a shop in mind vs having it sitting around apart and sitting in pieces looking for a shop but bike shop ya know, crank and seal service itself isnt really an issue its the splitting the cases because i assume ya gotta pull the trans b4 splitting them...? bike trannys r intimidating to me all those gears clips springs forks spacers in such a compact unit and also not having any specialty tools. Its just outa my expertise and i figure leave it to an expert vs grenading it cause i did it myself to save some $. And no idea on porting 2 stroke intake ports.

hotrodhalfton:
Another thing i concluded was for a bike that looked in real nice shape it was not maintained well, i told my son the air filter is a good indication of previous maintaininance, and upon inspecting it the air box was full of a rodent nest an the foam filter had large hole chewed in it an some idiot took zip ties and attempted to fix it!  Theres cheap foam filters for $15 not ideal but 200% better than a hole, ive never heard of an air/fuel/oil ratio include a dirt ratio in the formula! That mess swirling around the crank n piston is 1 reason i assume the lower end prob needs service too, its probably in really poor condition and i want to catch hopefully it before its worn beyond repair.

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