kx 250 compression

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Mar 20, 2007
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#1
I have a 2002 kawasaki kx 250. I'm having a hard time getting it to start. Especially when it is cold. I was wondering how much compression should my bike have? And also how low can it get before you need to rebuild it?
 
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Oct 23, 2007
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#3
Ive got the same bike, 02 KX250. the dude i bought it from said some after market stuff was done to the engine, i wish i could say what was done. but i have a hard time starting mine too. once i get it started and warmed up, its easy to start. i think i almost broke my foot the last time i tried to start it. (i left for iraq so its been a while since i rode it last)
 

Woodsquest

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#4
Check your intake reeds. If they are stock, then they are probably frayed out a little or chipped. That will cause hard starting.
 
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#5
this is what the kawasaki service manual says on a kx 250 for a 2003 -2005

KX250:
Item Standard Service Limit
Cylinder Head
Cylinder Compression (Usable range) – – –
825 ∼ 1 275 kPa
(8.4 ∼ 13.0 kgf/cm², 119 ∼ 185 psi)
Cylinder Head Warp – – – 0.03 mm (0.0012 in.)
Cylinder, Piston
Cylinder Inside Diameter 66.400 ∼ 66.415 mm (2.6142 ∼ 2.6148 in.) 66.46 mm (2.617 in.)
30 mm (1.18 in.) below of the
cylinder head)
Piston Diameter 66.336 ∼ 66.351 mm (2.6116 ∼ 2.6122 in.) 66.19 mm (2.6059 in.)
Piston/Cylinder Clearance 0.049 ∼ 0.079 mm (0.0019 ∼ 0.0031 in.) – – –
Piston Ring/Groove Clearance 0.025 ∼ 0.06 mm (0.00098 ∼ 0.00236 in.) 0.16 mm (0.006 in.)
Piston Ring Groove Width 1.01 ∼ 1.03 mm (0.0398 ∼ 0.0406 in.) 1.11 mm (0.044 In.)
Piston Ring Thickness 0.970 ∼ 0.985 mm (0.0382 ∼ 0.0388 in.) 0.90 mm (0.035 in.)
Piston Ring End Gap 0.25 ∼ 0.45 mm (0.0098 ∼ 0.0177 in.) 0.75 mm (0.030 in.)
Piston Pin Diameter 17.995 ∼ 18.000 mm (0.7085 ∼ 0.7087 in.) 17.96 mm (0.707 in.)
Piston Pin Hole Diameter 18.001 ∼ 18.011 mm (0.7087 ∼ 0.7091 in.) 18.08 mm (0.712 in.)
Small End Inside Diameter 22.003 ∼ 22.012 mm (0.8663 ∼ 0.8666 in.) 22.05 mm (0.868 in.)