Maintenance & Technical > KX500 Original

88 vs 90 kx500

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Wilde1yamaha:
Hey guys I'm almost ready to assemble my 1988 kx500 and put the track kit on, my question is are the 1988 and 1990 cases and cranks the same? I know the cylinder is way different but what is is different? Thanks

dave916:
88 cases have more crankcase  volume/
88 cases boysen case port Wont match the 90 cylinder perfect
88 have no retainer on one gearbox bearing/ same size so no issue there
u need differant  lenght rear cylinder studs if  interchange 88/89 cylinders

Crank are pretty much the same 88/89 the just look differant /different method to balance/ holes vs countersunk area
 

Wilde1yamaha:
Are the case halves the same besides the bearing retainer or are they different volume?

dave916:

--- Quote from: Wilde1yamaha on December 02, 2019, 02:28:32 AM ---Are the case halves the same besides the bearing retainer or are they different volume?

--- End quote ---
Differant volume / 88 had larger crankcase volume

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