1990 cr125 help

[93blasterlover]

i just recently got a 1990 cr125. it has a BRAND NEW top end with about 2 hours on it. When i first got it the carb just poured out gas from the drain vent. I took it apart cleaned it, reset the float and it fixed it for about 10 min... then while riding it bogged down and died. The plug was fouled so i put a new one on. Same thing. So i need to fix the carb and the bogging! help

 

[Blaner]

what jets you got? does the float seal off at the needle and seat when the bowl is full?

 

[93blasterlover]

i will have to check the jet sizes and check the floats but it seemed to go in there ok

 

[alex90]

go a size or 2 smaller on the main jet. should fix it.. what ratio are you mixing ur fuel.. mix to 40:1.. 32:1 in a 125 is way to thick and will bog the bike

 

[93blasterlover]

um i mix at 32;1 but the guy said he ran it rix on the mixture on the new top end?

 

[alex90]

trust me 40:1 is the way to go.. and once it breaks in completely u can drop it as far as 50:1 (my favorite mix)

 

[93blasterlover]

it just seems so lean.. haha ill try

 

[alex90]

my 05 kx125 modded race bike (now training bike) is on the original piston and bore from when i first built it in 05, i just re-ring it once a year. it runs on nothing but a 50:1 mix of maxima super M and premium pump gas.. i ride the piss out of that bike and no issues of over heating cracking skirts or seizure, ive rode everything from arenacross races to loretta lynns on the same exact fuel mixture and set up never a single failure, if its jetted and running correctly the clutch will fail before the topend on a 125

 

[Larry's Shee]

Check the sticky on "Almost free carb repair" Good tip on cleaning needle seat. If that doesn't work you'll need a new seat and needle. DON'T go changing jets till you have that problem fixed. How do you know it needs leaner jetting?