Maintenance & Technical > KX250 / KX125

KX 250 rod, cylinder, and PV questions

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ihampson:

--- Quote from: CR480R on October 18, 2007, 09:32:12 AM ---I am rebuilding a '91 kdx250 engine to put in my 3-wheeler...  I am rebuilding a '95 KX250 crank to put in it and need to know what the rod side clearance should be on my new connecting rod... I also need to know the allowable crank runout? .001? .0005? I am using a '98 KX250 cylinder and piston was wondering if the powervalve gears should be lubed when top-end is assembled? If so, what type of lube?   Thanks-Justin

--- End quote ---
Did you find out. I have a manual but its for 82 - 91 kx`s
In the clymer manual it says -

runout new should be 0 - 0.03mm (0 - 0.001 in) and service limit is 0.05mm  (0.002 in)

rod side clearance  new - 0.45 - 0.55mm (0.018 - 0.022 in) service limit - 0.70mm (0.028 in)

big end radial clearance new - 0.037 - 0.049mm (0.0015 - 0.0019 in) service limit - 0.1mm (0.04 in) Limit seems a lot too me but thats what it says!

Not sure if these specs are exact for your bike but thought i look em up anyway. The parts fit the 91 engine so could be the same measurments?

CR480R:

--- Quote from: CR480R on October 31, 2007, 09:22:18 AM ---Yes it is nearly a bolt on deal... I need to get the 2 shorter front cylinder studs from the '98...and shorten the lever for the powervalve a bit or get the lever from a newer bike... But thats it...
--- End quote ---

Ok... I was wrong...  I had to do some mild clearancing on the cases for the connecting rod to clear...

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