Maintenance & Technical > KX250 / KX125

2004 KX 125 Rebuild

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KXDINO:
what your fuel to oil ratio , even at 40 to 1 a little bit comes out , not much though , is your jetting rich ?

DP3601:

--- Quote from: KXDINO on March 08, 2017, 09:14:15 AM ---what your fuel to oil ratio , even at 40 to 1 a little bit comes out , not much though , is your jetting rich ?

--- End quote ---

I run it at 32:1.  In my racing days I always ran 40:1 with the engine work done.   The bike is bone stock except for a boyesen rad valve and power wing I was siding on the 32:1 to be safe.  Jetting is spot on.   Do you think I need to run it at 40:1?

KXDINO:
It up to you of course ,32 to 1 is good myself i run 40 to 1 on all my 2 strokes from 144 to 500 , motorex oil , the 250 get a drop coming out of that pipe but no oil get to the back of the muffler , the 144 which is a 08 kx125 has had major porting and uses a wossner yz 144 flat top piston with a machined vhm head to suit , goes hard with a wide power band but it had to be jetted up to survive as more power = more fuel.

DP3601:

--- Quote from: KXDINO on March 09, 2017, 07:02:07 AM ---It up to you of course ,32 to 1 is good myself i run 40 to 1 on all my 2 strokes from 144 to 500 , motorex oil , the 250 get a drop coming out of that pipe but no oil get to the back of the muffler , the 144 which is a 08 kx125 has had major porting and uses a wossner yz 144 flat top piston with a machined vhm head to suit , goes hard with a wide power band but it had to be jetted up to survive as more power = more fuel.

--- End quote ---

Thanks, I think I will try that at 40:1 and watch the jetting so I dont end up to lean.

DP3601:

--- Quote from: DP3601 on March 09, 2017, 01:23:20 PM ---
--- Quote from: KXDINO on March 09, 2017, 07:02:07 AM ---It up to you of course ,32 to 1 is good myself i run 40 to 1 on all my 2 strokes from 144 to 500 , motorex oil , the 250 get a drop coming out of that pipe but no oil get to the back of the muffler , the 144 which is a 08 kx125 has had major porting and uses a wossner yz 144 flat top piston with a machined vhm head to suit , goes hard with a wide power band but it had to be jetted up to survive as more power = more fuel.

--- End quote ---

Thanks, I think I will try that at 40:1 and watch the jetting so I dont end up to lean.

--- End quote ---

Thanks KXDINO, that cleaned it right up and running better and much crisper!!

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